Talk:Spectral indices

Spectral indices using Processing Toolbox

! Multiband calcualtion does currently not work, only single index bands!

A convenient module for calculating one or several spectral indices at the same time can be found in the QGIS processing toolbox.

• Type Radiometric into the search field and find the OTB --> Feature Extraction --> Radiometric Indices) tool.
• Open it with a double click.
• Assign the bands in the multiband file to the correct spectral sensitivity.
• in the text field Available Radiometric Indices type:

Vegetation:NDVI Enter Water:NDWI Enter Soil:BI2 Enter. Click Run.

• Click Helpto find an overview on available spectral indices in three categories (vegetation, water, soil) and relevant channels of the input multiband image.

• Display the output multiband spectral indices image as a color composite in the canvas (Fig. B).

Figure A: Single band NDVI displayed with color table RdYlGn

Figure B: Color composite of three spectral indices: RGB=NDVI, BI2, NDWI