[GRASS-user] create a common colour scale

[Anna Petrášová]

On Tue, Jul 22, 2014 at 10:46 PM, <Raphael.Viscarra-Rossel at csiro.au> wrote:

>  Thank you Daniel and Anna for the suggestions.
> Daniel, I wonder how I might display the ‘common’ colour legend when
> visualising the maps?
> When the maps are visualised, the colour legend changes to the min max of
> the current map displayed.
>

Look at range option. You have to know the min/max values though. I am not
sure what's the best option in grass64. r.series would work but it creates
maps which is unnecessary.

>
>  Anna, I use GRASS 6.4.2 – so I guess I should upgrade…
>

I would recommend that.

>
>  Thank you again.
> 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
>
>
>
>
>   From: Anna Petrášová <kratochanna at gmail.com>
> Date: Wednesday, 23 July 2014 12:15 pm
> To: Daniel Victoria <daniel.victoria at gmail.com>
> Cc: "Viscarra Rossel, Raphael (L&W, Black Mountain)" <
> Raphael.Viscarra-Rossel at csiro.au>, grass <grass-user at lists.osgeo.org>
> Subject: Re: [GRASS-user] create a common colour scale
>
>   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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>>> grass-user mailing list
>>> grass-user at lists.osgeo.org
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>>
>>
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>
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