The following article describes how to generate vegetation indices using the default index options and how to generate a customized index using the index calculator
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To generate predefined indices based on the imported images.
1. Click Index above the Layers Menu. The INDEX GENERATOR tool opens.
2. Select the Source layer.
3. Select the vegetation index that you want to generate by checking the corresponding boxes.
4. Click Generate.
|Index||Description||Formula||Image import type||Platform|
|BNDVI - Blue Normalized Difference Vegetation Index||NDVI index without red channel availability, for areas sensitive to chlorophyll content.||(nir - blue) / (nir + blue)||Multispectral (excluding Sequoia)||Drone and satellite.|
|GNDVI - Green Normalized Difference Vegetation Index||NDVI index without red channel availability, for areas sensitive to chlorophyll content.||(nir - green) / (nir + green)||Multispectral||Drone and satellite.|
|LCI - Leaf Chlorophyll Index||
Index to assess chlorophyll content in areas of complete leaf coverage.
Value range clamp between -1 and 1.
|(nir - rededge) / (nir + red)||Multispectral||Drone and satellite.|
|MCARI - Modified Chlorophyll Absorption in Reflective Index||Index used to measure chlorophyll concentrations including variations in the Leaf Area Index.||1.2 * (2.5 * (nir - red) - 1.3 * (nir - green)) / (normalized to the maximum value of red, green, and nir bands)||Multispectral||Drone and satellite.|
|NDRE - Normalized Difference Red Edge||Index sensitive to chlorophyll content in leaves against soil background effects. This index can only be formulated when the red edge band is available.||(nir - rededge) / (nir + rededge)||Multispectral||Drone and satellite.|
|NDVI - Normalized Difference Vegetation Index||Generic index used for leaf coverage and plant health.||(nir - red) / (nir + red)||Multispectral||Drone and satellite.|
|SIPI2 - Structure Intensive Pigment Index 2||
Index used in areas with high variability in canopy structure (e.g. forestry).
|(nir - green) / (nir - red)||Multispectral||Drone and satellite.|
|TGI - Triangular Greenness Index||RGB index for chlorophyll sensitivity.||(green - (0.39 * red) - (0.61 * blue)) /(normalized to the maximum value of red, green, and blue bands)||RGB||Drone and satellite.|
|VARI - Visible Atmospherically Resistant Index||RGB index for leaf coverage.||min(1; max(-1; (green - red) / (green + red - blue) ))||RGB||Drone and satellite.|
|NDMI - Normalized Difference Moisture Index||NDWI uses the NIR and SWIR bands to monitor changes in water content of leaves.||(nir - swir_1613) / ( nir + swir_1613)||Multispectral||Satellite|
|Note 1: min(1, max(-1, ...) is clamping the values between -1 and 1.|
To generate a custom index using the index calculator.
1. Open the INDEX GENERATOR by clicking the icon at the top right of the window.
2. Choose the source layer.
3. Click Create custom index below the list of available indices.
4. Name the index.
5. Enter the formula either by clicking the Operations and the Available bands buttons or by using your keyboard.
When a formula is valid, the Preview button turns green.
6. Click the Preview button to preview your index.
7. When you are satisfied with the preview, click Apply
8. The generated custom index now appears in the list of layers and in the map interface.
Custom indices can be created depending on the available bands from your imported images, these are listed as buttons under Available bands.
The Operations buttons are described below:
|)||close parenthesis||abs||absolute value|
|-||subtraction||max||maximum value between two arguments, the separator is ";" (semicolon)|
|/||division||min||minimum value between two arguments, the separator is ";" (semicolon)|
|;||(semicolon) separator for functions that take more than one parameter||sqrt||square root|