Spectral indices
From AWF-Wiki
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(→Vegetation index using the Raster Calculator) |
(→Vegetation index using the Raster Calculator) |
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# After clicking {{button|text=Open}}, the raster layer appears in the QGIS canvas. | # After clicking {{button|text=Open}}, the raster layer appears in the QGIS canvas. | ||
# Click {{mitem|text=Raster --> Raster calculator}}. | # Click {{mitem|text=Raster --> Raster calculator}}. | ||
| − | # A powerful normalization is realized by the ''normalized difference vegetation index'' that forms the basis of most vegetation indices $NDVI = ( | + | # A powerful normalization is realized by the ''normalized difference vegetation index'' that forms the basis of most vegetation indices $NDVI = (Nir - Red) / (Nir + Red)$. It can be implemented using {{tool|text=Raster Calculator}} as seen in the following screenshot: |
| − | [[File:Qgis_raster_calc_ndvi.png | | + | [[File:Qgis_raster_calc_ndvi.png |800px]] |
== Spectral indices using OTB == | == Spectral indices using OTB == | ||
Revision as of 15:44, 8 November 2017
Vegetation index using the Raster Calculator
- Click the Add raster layer
and select a multiband Sentinel-2 satellite image
- Check the rank and spectral range of bands in the multiband file (e.g. see table Changing Raster Layer Style).
- After clicking Open, the raster layer appears in the QGIS canvas.
- Click Raster --> Raster calculator.
- A powerful normalization is realized by the normalized difference vegetation index that forms the basis of most vegetation indices $NDVI = (Nir - Red) / (Nir + Red)$. It can be implemented using Raster Calculator as seen in the following screenshot:
