Unsupervised classification (Tutorial)
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==Unsupervised K-Means classification== | ==Unsupervised K-Means classification== | ||
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| − | + | * Type into the search box of the Windows taskbar: {{typed|text=mapla.bat}}. Click on mapla.bat to open the Monteverdi Application Launcher. | |
| − | + | * In the search engine of the Processing Toolbox, type {{typed|text=kmeans}} and double click '''KMeansClassification'''. | |
| − | + | * Specify a multispectral image as Input Image. | |
| − | + | * Specify directory and name for the Output image. Select the output data type {{button|text=uint 8}} from the pull-down list. | |
| − | + | * Set the {{button|text=Number of classes}} to {{typed|text=20}} | |
| − | + | * Check the {{button|text=Training set size}} to {{typed|text=10000}} | |
| + | * Click on {{button|text=Execute}}. | ||
| + | * Load the resulting image into QGIS. It is single band file with 20 grey levels labeled from 0 to 19. | ||
| + | * {{mitem|text=Layer Properties --> Symbology --> Render type}}. Switch to {{button|text=Singleband pseudocolor}} and select a '''Color ramp''' (e.g. Spectral). Select the Mode {{button|text=Equal interval}} and set the number of classes to {{typed|text=20}} | ||
| + | [[File:qgis_otb_kmeans.png|400px]] | ||
[[Category:QGIS Tutorial]] | [[Category:QGIS Tutorial]] | ||
Revision as of 16:37, 23 November 2018
Unsupervised K-Means classification
- Type into the search box of the Windows taskbar: mapla.bat. Click on mapla.bat to open the Monteverdi Application Launcher.
- In the search engine of the Processing Toolbox, type kmeans and double click KMeansClassification.
- Specify a multispectral image as Input Image.
- Specify directory and name for the Output image. Select the output data type uint 8 from the pull-down list.
- Set the Number of classes to 20
- Check the Training set size to 10000
- Click on Execute.
- Load the resulting image into QGIS. It is single band file with 20 grey levels labeled from 0 to 19.
- Layer Properties --> Symbology --> Render type. Switch to Singleband pseudocolor and select a Color ramp (e.g. Spectral). Select the Mode Equal interval and set the number of classes to 20
