[GRASS-user] More maps with same legend (for visually compare)

[Markus Neteler]

On Fri, Nov 7, 2008 at 3:18 PM, Moritz Lennert
<mlennert at club.worldonline.be> wrote:
> On 07/11/08 15:06, Bornemisza Imre wrote:
>>
>> Dear GRASS-User List,
>>
>> I have a CSV file with X,Y,Z coords of 150 point in a time series (50
>> measuring).
>> I imported it in a for cycle of $i (1..50):
>>
>> v.in.ascii input=su1_data.csv output=su1_v_$i format=point fs=';' skip=2
>> x=2
>> y=3 z=$iplus4 cat=0 --overwrite
>>
>> and made surface with:
>>
>> v.surf.rst input=su1_v_$i layer=1 dmax=25 dmin=5 zmult=1 tension=40
>> segmax=200
>> npmin=100 zcolumn=dbl_$i elev=su1_v_surf_rst_$i --overwrite
>>
>> I displayed the maps with:
>>
>> d.erase
>> d.rast su1_v_surf_rst_$i
>> d.legend map=su1_v_surf_rst_$i
>>
>> and would like compare it visually.
>>
>> The problem is, that the scaling
>>  and coloring of surfaces is different by each map.
>> Is it possible to set with a parameter of v.surf.rst that
>>  all maps legend should have use the legend
>>  with the same highest and deepest point?
>> I don't find so a parameter.
>> Is there another solut ion to visualize the time series?
>
> This is not a v.surf.rst issue, but a r.colors issues. You can either create
> a customized color table in a file and use r.colors rules= to apply these
> rules to all your maps, or, if you have one raster map which is the
> reference map, you can also use r.colors raster=

Just as a note, I have recently added a rast parameter to d.rast.leg:

Parameters:
....
          rast   Name of raster map to generate legend from

Of course this reference raster map should have a range covering all
maps in question.

Markus