Yer, but as mapcalc has some built-in functions like x() and y() to retrieve the x-y coordinates, I think it could be easy to trasform them in projected coordinates. I'm writing a few lines in C to solve it, but I think I'll take a look to r.mapcalc code to see if it would be possible to add something like x_coord() and y_coord()...
2008/7/14 Paul Kelly <[EMAIL PROTECTED]>: > On Mon, 14 Jul 2008, G. Allegri wrote: > >> How can I control mapalgebra "if" statements on the base of the >> coordinates values of a cell? >> The base problem is to change the values of some specific cells on the >> base of their coordinates. > > I suspect this might not be possible with r.mapcalc, because each variable > in an r.mapcalc expression is effectively an entire map and the expression > used to generate the output map can't be changed based on the co-ordinates > of individual cells in the input map. I.e., the same expression applies to > each and every cell in the output map. > > That's my understanding anyway, based on an answer Glynn gave me a few years > ago: > http://lists.osgeo.org/pipermail/grass-user/2003-January/008182.html > Does that seem relevant to your case? > > Paul > _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
