In reply to:
I tried to be able to know visually how many cells I've got in
my raster maps ,so I need to put a grid with rectangular :
dimension 4.5 lat,7.5 lon.So far,I couldn't get anything
like this with d.grid,when I enter the coordonnes in size=values
it doesn't work.
My questions are:can we get a grid with rectangular cell,and how?
d.grid doesn't allow you to display a grid with unequal axes. To
produce such a grid, you must write an input file for the d.mapgraph command.
Read the entry for d.mapgraph in the Reference Manual. Once written, you
can overlay the grid on your maps by using the command
d.mapgraph input='name of inputfile'
Is there another command which give the possibilities to overwrite
this grid on the raster map(i.e get this grid permanently)
No. If you want a grid 'etched into' a rastermap, you must draw
it yourself using v.digit, rasterize it using v.to.rast, and patch it into
your rastermap using r.patch. This is an ugly solution. If you just want
to see the grid each time you display the rastermap, it's better to take
the trouble of typing in TWO commands (d.rast ...., d.mapgraph ...)
Thanks for your help.
Cathy
Martijn van Leusen