Thu, Dec 5 2002
12:34:54
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Request created by guest
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Subject: full floats support for r.colors, please
Platform: GNU/Linux/i386
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: 5.00
Wouldn't it be awfully nice to have r.colors color=grey.eq|grey.log|random etc
working for rasters of floats?
Peter |
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Thu, Dec 5 2002
15:18:25
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Mail sent by neteler@itc.it
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Thu, 5 Dec 2002 15:18:22 +0100
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Markus Neteler <neteler@itc.it>
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Request Tracker <grass-bugs@intevation.de>
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Subject |
Re: [GRASS5] [bug #1470] (grass) full floats support for r.colors, please
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On Thu, Dec 05, 2002 at 12:34:54PM +0100, Request Tracker wrote:
> this bug's URL: http://intevation.de/rt/webrt?serial_num=1470
> -------------------------------------------------------------------------
>
> Subject: full floats support for r.colors, please
>
> Platform: GNU/Linux/i386
> grass obtained from: Trento Italy site
> grass binary for platform: Compiled from Sources
> GRASS Version: 5.00
>
> Wouldn't it be awfully nice to have r.colors color=grey.eq|grey.log|random
etc working for rasters of floats?
>
> Peter
Right. You are kindly invited to help with that :-)
Markus
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Tue, Mar 11 2003
10:45:53
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Mail sent by mneteler
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Could you try the
1. r.recolor - this new program allows to make color management for
raster map using categories distribution in equal area mode and
generate desiring color levels using extended possibilities for linear
color interpolation or file color sets. The program works with FP maps
and has description (file DESCRIPTION in folder with program). This
program is very usefull to us because able to show maps with different
kinds of histograms. We hope it will be usefull to others.
available in
http://grass.itc.it/outgoing/SJGeo.tar.gz
and report to 'grass5'?
Markus
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Tue, Feb 27 2007
17:41:07
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Taken by mlanda
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Thu, Oct 4 2007
17:19:27
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Mail sent by msieczka
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guest wrote (Thu, Dec 5 2002 12:34:54):
> Wouldn't it be awfully nice to have r.colors color=grey.eq|grey.log|random
etc
> working for rasters of floats?
Glynn added flags -e and -g to to r.colors few weeks ago, which allow to
equalize any color table now, and floating point rasters are supported too.
An outstanding issue is 'random' colortable for floating point rasters. I
don't if this is possible. Still only integer rasters are supported.
Maciek
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Sun, Oct 7 2007
05:07:19
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Sat, 6 Oct 2007 20:07:11 -0700 (PDT)
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Hamish <hamish_nospam@yahoo.com>
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Re: [GRASS-dev] [bug #1470] (grass) full floats support for r.colors, please
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Maciek Sieczka via RT <grass-bugs@intevation.de>, peter.loewe@gmx.de
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Maciek Sieczka wrote:
> An outstanding issue is 'random' colortable for floating point rasters. I
> don't if this is possible. Still only integer rasters are supported.
you could do it by splitting into ranges first, e.g. like r.stats or
d.histogram's nsteps= option.
Hamish
____________________________________________________________________________________
Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for
today's economy) at Yahoo! Games.
http://get.games.yahoo.com/proddesc?gamekey=monopolyherenow
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Sun, Oct 7 2007
16:43:41
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Sun, 7 Oct 2007 15:42:28 +0100
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Hamish <hamish_nospam@yahoo.com>
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Maciek Sieczka via RT <grass-bugs@intevation.de>, peter.loewe@gmx.de, grass-dev@grass.itc.it
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Re: [GRASS-dev] [bug #1470] (grass) full floats support for r.colors, please
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Hamish wrote:
> > An outstanding issue is 'random' colortable for floating point rasters. I
> > don't if this is possible. Still only integer rasters are supported.
>
> you could do it by splitting into ranges first, e.g. like r.stats or
> d.histogram's nsteps= option.
You can even use the map's quantisation rules.
But the main issue is whether it's sensible to assign a random colour
table to an FP map. IMHO, a random colour table only makes sense if
the number of categories is small.
If there are many categories (e.g. an integer DEM), it's likely that
the "clusters" of adjacent, same-valued cells will actually be
individual cells. In that situation, a random colour table will just
give you "snow".
A secondary consideration is that a random colour table requires one
rule for each category, which can result in very large colour tables,
which can be slow to create (IIRC, the time taken to create a colour
table is proportional to the square of the number of entries).
IOW a random colour table only makes sense if the data consists of
discrete categories rather than a scalar value. Integer maps can be
either categories or scalars, but FP maps are always scalars.
--
Glynn Clements <glynn@gclements.plus.com>
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Tue, Oct 9 2007
18:48:02
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Status changed to resolved by msieczka
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Tue, Oct 9 2007
18:48:02
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Mail sent by msieczka
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glynn@gclements.plus.com wrote (Sun, Oct 7 2007 16:43:41):
> IOW a random colour table only makes sense if the data consists of
> discrete categories rather than a scalar value. Integer maps can be
> either categories or scalars, but FP maps are always scalars.
In that case I'd call the case closed. If anybody minds please re-open the ticket.
Maciek
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