I have a raster image (.tif) that is multi bands (35 band), floating point data type that does not have attribute table, and a grid shapefile of 107 polygon created by the fishnet function in ArcGIS. Now, I need to overlay them to get the mean value of each polygon of that grid from underlying raster image values.
How can I do that using ArcGIS or ENVI?
I tried to use zonal statistics (tabulate) but nothing would be computed as there is no attribute table for the image!