Land Cover/Use Classification using the Semi-Automatic Classification Plugin for QGIS
From AWF-Wiki
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| − | + | =Working steps= | |
| − | + | ==Preparing raster data (Converting DN to reflectance)== | |
| − | + | # Load the multiband raster file ''Subset_S2A_MSIL2A_20170619T.tif'' available in the [[Course data|course data]]. This contains all 13 bands of Sentinel-2 scene. | |
| − | + | # Follow [[Split stack]] to extract bands 2, 3, 4, 5, 6, 7, 8, 11 and 12, using the multiband raster file ''Subset_S2A_MSIL2A_20170619T.tif'' as input layer. | |
| − | + | # In the processing toolbar, type {{typed|text=Raster calculator}} into the search field to find the {{button|text=GDAL\OGR --> Raster calculator}} tool and open it. | |
* Click the button {{button|text=Run as batch process...}}, and use {{button|text=Add row}} [[Image:Add_rows.PNG]] button to add enough processing rows. | * Click the button {{button|text=Run as batch process...}}, and use {{button|text=Add row}} [[Image:Add_rows.PNG]] button to add enough processing rows. | ||
* Click the button {{button|text=...}} of '''Input layer A''' to select the single extracted bands as input layers (i.e. one per row). | * Click the button {{button|text=...}} of '''Input layer A''' to select the single extracted bands as input layers (i.e. one per row). | ||
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* Click the button {{button|text=...}} of '''Calculated''' to save output file | * Click the button {{button|text=...}} of '''Calculated''' to save output file | ||
* Click {{button|text=Run}} | * Click {{button|text=Run}} | ||
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| + | # Follow [[Create stack]] to create a multiband raster file from the converted single bands from step 3 | ||
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| + | ==Defining classification inputs in SCP-plugin== | ||
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[[Category:QGIS Tutorial]] | [[Category:QGIS Tutorial]] | ||
Revision as of 01:26, 26 November 2017
Working steps
Preparing raster data (Converting DN to reflectance)
- Load the multiband raster file Subset_S2A_MSIL2A_20170619T.tif available in the course data. This contains all 13 bands of Sentinel-2 scene.
- Follow Split stack to extract bands 2, 3, 4, 5, 6, 7, 8, 11 and 12, using the multiband raster file Subset_S2A_MSIL2A_20170619T.tif as input layer.
- In the processing toolbar, type Raster calculator into the search field to find the GDAL\OGR --> Raster calculator tool and open it.
- Click the button Run as batch process..., and use Add row
button to add enough processing rows.
- Click the button ... of Input layer A to select the single extracted bands as input layers (i.e. one per row).
- Enter and repeat the expression A/10000 under Calculation in gdalnumeric syntax using +-/* or any numpy array functions (i.e. logical_and()) and set Output raster type to Float32
- Click the button ... of Calculated to save output file
- Click Run
- Follow Create stack to create a multiband raster file from the converted single bands from step 3
