I am trying to calculate NDVI based on RedEdge-M image data.
According to RedEdge-M Manual: Specifications – MicaSense Knowledge Base, relevant bands are 3 and 4. I imported the images accordingly.
As you can see, the two images are shown on the left.
However, I am unable to select dropdown "Indices" since it is grayed out.
Any suggestions on what to do?
Rather than adding the individual bands, can you add the entire multispectral raster to the Map and select it in the Contents pane? That will enable the Indices drop-down.
From where you are now, you can use the NDVI raster function as well. The function gives you a little more control over which specific bands to use in the NDVI analysis, so it might be a good idea to start here:
If you'd like to read some of the documentation on the NDVI raster function and raster functions in general in ArcGIS Pro, here's some of the relevant ones:
Hopefully that helps!