On 6/30/2010 12:12 AM, P Kishor wrote: > I have a rectangular map of square grid cells. Each grid cell has an > x,y (lat,lon) centroid, and a serial number, the cell_id, starting at > 0,0 in the top-left corner, and increasing to the right and down. Here > is a picture > > 1 2 3 .. 9 > 10 11 12 .. 19 > ..
I suggest writing a routine to calculate x,y from lat,lon. Then use that to locate the points of interest. Alternatively, just precalculate the lat,lon to x,y for all your cells in a single piddle and use a look up table approach. PDL> ??utm PDL> ??project may be of help here. As always, I recommend trying things out on a toy sized problem in the PDL shell to get a feel for the problem and to try alternative solutions. Working through the examples in the PDL book is a good introduction to thinking in PDL terms as well. Cheers, Chris _______________________________________________ Perldl mailing list [email protected] http://mailman.jach.hawaii.edu/mailman/listinfo/perldl
