http://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&feed=atom&action=historyLand Cover/Use Classification using the Semi-Automatic Classification Plugin for QGIS - Revision history2024-03-28T19:42:30ZRevision history for this page on the wikiMediaWiki 1.19.3http://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15157&oldid=prevHfuchs at 22:38, 30 June 20192019-06-30T22:38:46Z<p></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 22:38, 30 June 2019</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># When satisfied with preview and training input open {{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click [[File:Output_button.PNG]] to specify an output destination. Results will be displayed in QGIS canvas after the processing.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># When satisfied with preview and training input open {{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click [[File:Output_button.PNG]] to specify an output destination. Results will be displayed in QGIS canvas after the processing.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Repeat with other algorithms (Minimum Distance and Spectral Angle) and compare results and performance.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Repeat with other algorithms (Minimum Distance and Spectral Angle) and compare results and performance.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">=Postprocessing=</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Remove raster polygons smaller than a provided threshold size (in pixels) and replace them with the pixel value of the largest neighbour polygon. It is useful if you have a large amount of small areas  pixel on the pixel-wise classification map.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Click [[File:qgis_scp_bandset_button2.png]] {{mitem|text=SCP Working toolbar --> Postprocessing --> }}.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Select a thematic classification output.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Specify a threshold in pixels. Only raster polygons smaller than this size will be removed. This should correspond to the Minimum Mapping Unit (MMU).</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Choose 8-connnectedness</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* Click run and define a new output raster file.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[File:qgis_scp_post_sieve.png|400px]]</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Accuracy assessment=</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Accuracy assessment=</div></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15156&oldid=prevHfuchs: /* Classification */2019-06-30T21:56:04Z<p><span dir="auto"><span class="autocomment">Classification</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use [[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use [[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># When satisfied with preview and training input open {{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click [[File:Output_button.PNG]] to specify an output destination. Results will be displayed in QGIS canvas after the processing.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># When satisfied with preview and training input open {{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click [[File:Output_button.PNG]] to specify an output destination. Results will be displayed in QGIS canvas after the processing.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># Repeat with other algorithms (Minimum Distance and Spectral Angle)<del class="diffchange diffchange-inline">to </del>compare <del class="diffchange diffchange-inline">their </del>performance.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># Repeat with other algorithms (Minimum Distance and Spectral Angle) <ins class="diffchange diffchange-inline">and </ins>compare <ins class="diffchange diffchange-inline">results and </ins>performance.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Accuracy assessment=</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Accuracy assessment=</div></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15155&oldid=prevHfuchs: /* Classification */2019-06-30T21:55:09Z<p><span dir="auto"><span class="autocomment">Classification</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># Under {{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use C_ID}} <del class="diffchange diffchange-inline">to use land cover classesIDs </del>for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}}</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># Under {{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use C_ID}} for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}}</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the classification preview pointer.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the classification preview pointer.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use [[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use [[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15154&oldid=prevHfuchs: /* Classification */2019-06-30T21:54:36Z<p><span dir="auto"><span class="autocomment">Classification</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Under {{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use C_ID}} to use land cover classesIDs for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Under {{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use C_ID}} to use land cover classesIDs for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the <del class="diffchange diffchange-inline">classificatin </del>preview pointer.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the <ins class="diffchange diffchange-inline">classification </ins>preview pointer.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use <del class="diffchange diffchange-inline">the button </del>[[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use [[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># When satisfied with <del class="diffchange diffchange-inline">the </del>preview and training input open {{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click <del class="diffchange diffchange-inline">the button </del>[[File:Output_button.PNG]] to specify an output destination. Results will be displayed in QGIS canvas after the processing.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># When satisfied with preview and training input open {{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click [[File:Output_button.PNG]] to specify an output destination. Results will be displayed in QGIS canvas after the processing.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># Repeat with other algorithms to compare their performance.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># Repeat with other algorithms <ins class="diffchange diffchange-inline">(Minimum Distance and Spectral Angle)</ins>to compare their performance.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Accuracy assessment=</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Accuracy assessment=</div></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15153&oldid=prevHfuchs: /* Classification */2019-06-30T21:52:44Z<p><span dir="auto"><span class="autocomment">Classification</span></span></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 21:52, 30 June 2019</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"># Click {{mitem|text=SCP Dock --> Classification dock --> Macroclasses}} to set the colours for each class.</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Under {{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use C_ID}} to use land cover classesIDs for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Under {{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use C_ID}} to use land cover classesIDs for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}}</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the classificatin preview pointer.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the classificatin preview pointer.</div></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15152&oldid=prevHfuchs: /* Classification */2019-06-30T21:52:19Z<p><span dir="auto"><span class="autocomment">Classification</span></span></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 21:52, 30 June 2019</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Create some classification previews to get an overview of how the process will perform. This also helps to improve on the spectral signatures of training input for better classification results.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{mitem|text=SCP Dock --> Classification dock --> Macroclasses}} to set the colours for each class.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{mitem|text=SCP Dock --> Classification dock --> Macroclasses}} to set the colours for each class.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># <del class="diffchange diffchange-inline">Then under </del>{{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use <del class="diffchange diffchange-inline">MCID</del>}} to use <del class="diffchange diffchange-inline">Macroclass IDs </del>for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}} <del class="diffchange diffchange-inline">and under '''Land Cover Signature Classification''' check the box next to {{button|text=LCS}}.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># <ins class="diffchange diffchange-inline">Under </ins>{{mitem|text=SCP Dock --> Classification dock --> Classification algorithm}}, check {{button|text=Use <ins class="diffchange diffchange-inline">C_ID</ins>}} to use <ins class="diffchange diffchange-inline">land cover classesIDs </ins>for classification. For the '''algorithm''', select {{button|text=Maximum Likelihood}}</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the classificatin preview pointer.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># On the {{button|text=Working Toolbar}} click the button [[File:Preview_pointer.PNG]] to activate the classificatin preview pointer.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use the button [[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Then click a point on the image to display a classification preview in the map. Use the button [[File:Zoom_to_preview.PNG]] to zoom to the classification preview.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># When satisfied with the preview and training input <ins class="diffchange diffchange-inline">open </ins>{{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click the button [[File:Output_button.PNG]] to specify an output destination. Results will be displayed in QGIS canvas after the processing.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Classification can be performed after ROI creation and definition of spectral ranges.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># When satisfied with the preview and training input<del class="diffchange diffchange-inline">, check the box next to {{button|text=Algorithm}} under '''Land Cover Signature Classification'''.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># Open </del>{{mitem|text=SCP Dock --> Classification dock --> Classification output}} and click the button [[File:Output_button.PNG]] to specify an output destination. <del class="diffchange diffchange-inline">Be patient, processing needs some time! </del>Results will be displayed in QGIS canvas after the processing.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Repeat with other algorithms to compare their performance.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Repeat with other algorithms to compare their performance.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15151&oldid=prevHfuchs: /* Assess Spectral Signatures */2019-06-30T21:48:45Z<p><span dir="auto"><span class="autocomment">Assess Spectral Signatures</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_distances.png|600px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_distances.png|600px]]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* <del class="diffchange diffchange-inline">Examinae of </del>scatter plots of the highlighted signatures: click [[File:Qgis_scp_add_scatter.png|30px]].</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* <ins class="diffchange diffchange-inline">Examine </ins>scatter plots of the highlighted signatures: click [[File:Qgis_scp_add_scatter.png|30px]].</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_scatter_plot.png|600px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_scatter_plot.png|600px]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15149&oldid=prevHfuchs: /* Assess Spectral Signatures */2019-06-30T21:36:41Z<p><span dir="auto"><span class="autocomment">Assess Spectral Signatures</span></span></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 21:36, 30 June 2019</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Assess Spectral Signatures=</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>=Assess Spectral Signatures=</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Premise: Different materials may have similar spectral characteristics. Such pixels could be misclassified due to inability of classification algorithms to correctly discriminate those spectral signatures. Thus it is important to review spectral signatures of training samples and repeatedly modify them until all class training sets achieve adequate spectral separability. This can be done by 1) displaying and assessing '''spectral plots''' and/or 2) calculating the '''spectral distances''' of signatures.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Premise: Different materials may have similar spectral characteristics. Such pixels could be misclassified due to inability of classification algorithms to correctly discriminate those spectral signatures. Thus it is important to review spectral signatures of training samples and repeatedly modify them until all class training sets achieve adequate spectral separability. This can be done by 1) displaying and assessing '''spectral plots''' and/or 2) calculating the '''spectral distances''' of signatures.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Load an example SCP training input file: {{typed|text=\lucc\lucc_training_input.scp}}. Click {{mitem|text=SCP Dock --> Training input}} and click {{button|text=Open a training input}}.[[File:Qgis_scp_open_training.png|30px]] to open a '''training signature file''' with the extension '''.scp'''.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Load an example SCP training input file: {{typed|text=\lucc\lucc_training_input.scp}}. Click {{mitem|text=SCP Dock --> Training input}} and click {{button|text=Open a training input}}.[[File:Qgis_scp_open_training.png|30px]] to open a '''training signature file''' with the extension '''.scp'''.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Arrange signatures in ascending order by C_ID with a left-click the Column name '''C_ID'''.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Arrange signatures in ascending order by C_ID with a left-click the Column name '''C_ID'''.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Highlight all signatures of one C_ID in the ROI Signature list holding CTRL + left-click or Shift + left-click  on row numbers of the ROI signature list. Click [[File:Qgis_scp_merge_sig.png|30px]] {{button|text=Merge highlighted spectral signatures}} obtaining the average signature. The result is a new '''merged''' signature containing all ROIs of a class. Adjust the color field of the merged signature to the pre-defined color code.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Highlight all signatures of one C_ID in the ROI Signature list holding CTRL + left-click or Shift + left-click  on row numbers of the ROI signature list. Click [[File:Qgis_scp_merge_sig.png|30px]] {{button|text=Merge highlighted spectral signatures}} obtaining the average signature. The result is a new '''merged''' signature containing all ROIs of a class. Adjust the color field of the merged signature to the pre-defined color code.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Repeat this step for all C_ID classes.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Repeat this step for all C_ID classes.  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Highlight all single signatures in the ROI list and click [[File:Qgis_scp_roi_delete.png|30px]]. Keep only merged signatures in the ROI list.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Highlight all single signatures in the ROI list and click [[File:Qgis_scp_roi_delete.png|30px]]. Keep only merged signatures in the ROI list.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_merged_rois.png|400px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_merged_rois.png|400px]]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Highlight all merged signatures and click [[File:Qgis_scp_add_plot.png|30px]] adding highlighted signatures to spectral signature plot.   </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Highlight all merged signatures and click [[File:Qgis_scp_add_plot.png|30px]] adding highlighted signatures to spectral signature plot.   </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Observe differences between different pairs of land cover classes accross all wavelength ranges in the spectral signature plot.  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Observe differences between different pairs of land cover classes accross all wavelength ranges in the spectral signature plot.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_plot.png|600px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_plot.png|600px]]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>For the highlighted signatures click the button {{button|text=Calculate spectral distances}} [[File:Calc_sig_diff.PNG]]  </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>For the highlighted signatures click the button {{button|text=Calculate spectral distances}} [[File:Calc_sig_diff.PNG]]  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Click {{button|text=Signature details}} to unfold signature statistics for each wavelength range.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Click {{button|text=Signature details}} to unfold signature statistics for each wavelength range.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_details.png|600px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_details.png|600px]]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># </del>Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* </ins>Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_distances.png|600px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_distances.png|600px]]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># For examination </del>of scatter plots <del class="diffchange diffchange-inline">for </del>the highlighted signatures click [[File:Qgis_scp_add_scatter.png|30px]] <del class="diffchange diffchange-inline">adding highlighted items to a scatter plot</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Examinae </ins>of scatter plots <ins class="diffchange diffchange-inline">of </ins>the highlighted signatures<ins class="diffchange diffchange-inline">: </ins>click [[File:Qgis_scp_add_scatter.png|30px]].</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">[[File:Qgis_scp_scatter_plot.png|600px]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Classification =</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Classification =</div></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15147&oldid=prevHfuchs: /* Assess Spectral Signatures */2019-06-30T21:32:12Z<p><span dir="auto"><span class="autocomment">Assess Spectral Signatures</span></span></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 21:32, 30 June 2019</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># For the highlighted signatures click the button {{button|text=Calculate spectral distances}} [[File:Calc_sig_diff.PNG]]  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># For the highlighted signatures click the button {{button|text=Calculate spectral distances}} [[File:Calc_sig_diff.PNG]]  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Signature details}} to unfold signature statistics for each wavelength range.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Signature details}} to unfold signature statistics for each wavelength range.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_details.png|<del class="diffchange diffchange-inline">400px</del>]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_details.png|<ins class="diffchange diffchange-inline">600px</ins>]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_distances.png|<del class="diffchange diffchange-inline">400px</del>]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_distances.png|<ins class="diffchange diffchange-inline">600px</ins>]]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div># <del class="diffchange diffchange-inline">To examine </del>scatter plots for the highlighted signatures click <del class="diffchange diffchange-inline">the button {{button|text=Add highlighted items to scatter plot}} </del>[[File:<del class="diffchange diffchange-inline">Sct_plot</del>.<del class="diffchange diffchange-inline">PNG</del>]] to <del class="diffchange diffchange-inline">display </del>scatter plot.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># <ins class="diffchange diffchange-inline">For examination of </ins>scatter plots for the highlighted signatures click [[File:<ins class="diffchange diffchange-inline">Qgis_scp_add_scatter</ins>.<ins class="diffchange diffchange-inline">png|30px</ins>]] <ins class="diffchange diffchange-inline">adding highlighted items </ins>to <ins class="diffchange diffchange-inline">a </ins>scatter plot.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Classification =</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>= Classification =</div></td></tr>
</table>Hfuchshttp://wiki.awf.forst.uni-goettingen.de/wiki/index.php?title=Land_Cover/Use_Classification_using_the_Semi-Automatic_Classification_Plugin_for_QGIS&diff=15144&oldid=prevHfuchs: /* Assess Spectral Signatures */2019-06-30T21:28:33Z<p><span dir="auto"><span class="autocomment">Assess Spectral Signatures</span></span></p>
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<td colspan='2' style="background-color: white; color:black;">Revision as of 21:28, 30 June 2019</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Highlight all merged signatures and click [[File:Qgis_scp_add_plot.png|30px]] adding highlighted signatures to spectral signature plot.   </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Highlight all merged signatures and click [[File:Qgis_scp_add_plot.png|30px]] adding highlighted signatures to spectral signature plot.   </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Observe differences between different pairs of land cover classes accross all wavelength ranges in the spectral signature plot.  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Observe differences between different pairs of land cover classes accross all wavelength ranges in the spectral signature plot.  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_plot.png|<del class="diffchange diffchange-inline">400px</del>]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[[File:Qgis_scp_signature_plot.png|<ins class="diffchange diffchange-inline">600px</ins>]]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"># Use the {{button|text=Automatic thresholds}} [[File:Auto_treshold.PNG]] field to refine signature separability. It is also possible to refine the range within the plot. In the {{button|text=Plot Signature list}}, highlight a signature, click on the button {{button|text=Change value range interactively in the plot}} [[File:Edit_range_interactive.PNG]], click inside the plot to reduce or increase range. (NB. classes are well separated if there is no overlap in at least one band)</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># For the highlighted signatures click the button {{button|text=Calculate spectral distances}} [[File:Calc_sig_diff.PNG]]  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># For the highlighted signatures click the button {{button|text=Calculate spectral distances}} [[File:Calc_sig_diff.PNG]]  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Signature details}} to unfold signature statistics for each wavelength range.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Signature details}} to unfold signature statistics for each wavelength range.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[File:Qgis_scp_signature_details.png|400px]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Click {{button|text=Spectral distances}} to reveal spectral signature (dis)similarity metrics.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[File:Qgis_scp_signature_distances.png|400px]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># To examine scatter plots for the highlighted signatures click the button {{button|text=Add highlighted items to scatter plot}} [[File:Sct_plot.PNG]] to display scatter plot.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># To examine scatter plots for the highlighted signatures click the button {{button|text=Add highlighted items to scatter plot}} [[File:Sct_plot.PNG]] to display scatter plot.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
</table>Hfuchs