Spatial subset

Revision as of 16:03, 25 October 2017

Click the Add raster layer and select the file C:/OSGeo4W64/geodata/raster/s2/Subset_S2A_MSIL2A_20170619T.tif.
After clicking Open, the raster layer appears on the QGIS canvas.
Raster --> Extraction ---> Clipper...
Input file (raster): Choose a loaded file name fron the drop down list or click Select to browse to a file.
Output file: click Select to choose a new file name for the subset image.
The clipping mode is now already active. Hold a left click on the map canvas dragging a box of your region of interest.
Adjust the extent coordinates in the text file rounding the coordinates of 1 (upper left corner) x, y and 2 (lower right corner) x, y.

Load the vector file C:\OSGeo4W64\var\geodata\vector\Landkreis_Goe_neu_utm32.shp. This is the actual boundary of the county Göttingen. We create a new vecto file with the boundary of the municipality Göttingen.
Right click on Layer name in the Layers PanelProperties --> General. Change the Data source encoding from System to UTF-8. Click UTF-8.
Right click on Layer name in the Layers Panel and open the Attribute table.
Click and select by the expression: "NAME_4" ='Göttingen'. Select.

Right click on Layer name in the Layers Panel Save as.... Fill the form as shown below.

Make sure that the CRS is the same like the image file.

@@ Line 16: / Line 16: @@
 # Click [[File:Qgis_select_by_expression.png]] and select by the expression: {{typed|text="NAME_4" ='Göttingen'}}. {{button|text=Select}}.
 [[File:Qgis_select_munic.png|400px]]
-# Right click on Layer name in the Layers Panel {{button|text=Save as...}}
+# Right click on Layer name in the Layers Panel {{button|text=Save as...}}. Fill the form as shown below.
+[[File:Qgis_vector_save_as.png|400px]]
+Make sure that the CRS is the same like the image file.
+# Click {{button|text=Run}}.
 [[Category: Working with Raster Data]]