I try to do some work with remote sensing imagery. I try doing some supervised classification using Maximum Likelihood and firstly i do it with some training areas (a shapefile). At this point, all is well, the grid is correctly classified. It gives me at output a table with some statistics for each class on all bands. But when i try to use this table definition in a new supervised classification using table statistics from the previous training areas classification, it outputs a "blank" grid or a grid with the the same value for all the cells, even if i do it to the same grid previously tested.
Here attached my dbf table definition.
Thanks for any help.