Check and see if there are lots of missing values in your data. The FILL command requires adjacent valid points in order to trace the boundaries of the color changes, so it is not suitable when there are lots of embedded missing values.
If you regrid using an @ave regridding transformation, then the coarser grid will have valid data as long as there is at least one valid point from the fine grid within the coarse grid cell. So the number of missing values is greatly reduced.
On 3/15/2013 12:21 AM, golla nageswararao wrote: