[GRASSLIST:403] how to refer to cell's ,longitude latitude coordinates?

[Vishal Mehta]

Hi all,

I have a raster map, lat/long, 0.5 degrees resolution. I want to develop
solar radiation and related maps maps using r.mapcalc. This requires
refering to each cell's latitude and longitude, i.e. the equations will
include the cell's latitude and longitude. How do i do this in GRASS? Is
there like an intenral variable that indexes each cell's coordinates?

thanks,
vishal
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