[GRASS-user] create a common colour scale

[Anna Petrášová]

Hi,

in case you use GRASS 7, r.colors accepts multiple maps or a file with the
map names. So this should do it:
r.colors map=precip1,precip2,precip3 color=precipitation

Also, have a look at temporal modules (GRASS 7 only). You can register the
series of maps as a dataset (t.create, t.register) and then you can easily
get the min, max values for the entire series and there is also
t.rast.colors.

Anna


On Tue, Jul 22, 2014 at 9:41 PM, Daniel Victoria <daniel.victoria at gmail.com>
wrote:

> Hi Raphael,
>
> This is what I did some time ago when I had the same problem
> 1) Find out the overall minimun and maximum precipitation over all maps.
> 2) Use r.colors with the rules option to compose a colortable that cover
> my entire precip range.
> 3) Apply the same colortable to all maps
> 4) plot and be happy
>
> Hope it helps
> Daniel
>
>
> On Tue, Jul 22, 2014 at 10:01 PM, <Raphael.Viscarra-Rossel at csiro.au>
> wrote:
>
>>  Hello
>> I wonder if anyone knows how to create a common colour scale for
>> different raster maps?
>> I want to display all six maps on the same page with the single colour
>> scale but I cannot find how to do this in GRASS.
>>
>>  More specifically, I have six raster maps of rainfall for different
>> time periods (each has a different range of values) and I would like to
>> display them all with the same colour scale. The colour scale needs to be
>> constructed using the min and max values of the set of six maps (and not
>> just individual maps.
>>
>>  Will appreciate any input please. Thank you,
>>
>>  Raphael.
>>
>>     __________________________
>>
>> Raphael *VISCARRA ROSSEL* | Principal Research Scientist | CSIRO Land
>> and Water | Bruce E. Butler Laboratory, Clunies Ross St, Black Mountain,
>> Acton ACT 2601 | PO BOX 1666 Canberra ACT 2600 | t. +61 2 6246 5945 | m. +61
>> 467 769 364 | Chair International Union of Soil Science Working Group on
>> Proximal Soil Sensing | www.researcherid.com/rid/B-4061-2011 |
>> scholar.google.com.au/citations?hl=en&user=KpJdvKEAAAAJ
>>
>>
>>
>>
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>
>
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