The Index Calculator produces index maps very efficiently. The software will first produce a reflectance map for each measured band. Index maps can then be generated on a pixel-by-pixel basis.
How to create an NDVI Map
For example, producing an NDVI map requires the reflectance data for the red and NIR bands since NDVI = (NIR-RED)/(NIR+RED).
In order to generate an NDVI Map:
- On the Menu bar, click View > Index Calculator.
- In the section 3. Index Map, select ndvi (this requires the red and NIR reflectance maps to have been computed).
- Click Generate.
- In the section 5. Export, click Export next to Colored Index Map (GEOTIFF) and GeoJPG (JPG).
- The exported Geotiff file can be found here: ...\project_name\4_index\indices\ndvi\
- (optional) Click Export next to Index Values and Rates as Polygon Shapefiles (SHP) with Grid Size [cm/grid] to export a prescription map. The .shp file can be found here: ...\project_name\4_index\indices\ndvi.
How to create a region
A region enables the generation of Index Maps on an area of interest in the project. To create a region:
- On the Index Calculator sidebar, in section 2. Regions, click Regions. The Region List pop-up appears.
- Click Add.
- (optional) Double click on unnamed to edit the name of the region.
- Click OK.
- Click on Draw to start drawing the polygon region in the Index View for the selected region name.
In the Index View, left-click to place polygon vertices, and right-click to create the last vertex and close the polygon. Ensure that after drawing a region, the check mark appears beside the button Clear.
- (optional) Click on Regions... to display the area of the regions and the percentage each region occupies among all the regions.