Spectral indices
From AWF-Wiki
(Difference between revisions)
(→Vegetation index using the Raster Calculator) |
(→Vegetation index using the Raster Calculator) |
||
| Line 4: | Line 4: | ||
# 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 $NDVI = (NIR-Red) / NIR + RED$. It | + | # 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 cac be implemented using {{tool|text=Raster Calculator}} as seen in the following screenshot: |
[[File:Qgis_raster_calc_ndvi.png |400px]] | [[File:Qgis_raster_calc_ndvi.png |400px]] | ||
Revision as of 15:37, 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 cac be implemented using Raster Calculator as seen in the following screenshot:
