[Qgis-user] legend for rasters

[Barend Köbben]

Hi Markus,

The trac item I think has nothing to do with a rester legend, but with
raster colour-ramps. The legend is needed for the user to understand the
map, without it the print composer and other emasn of getting maps to
end-users are rather useless for raster maps, if there's no way of letting
the user know what the colours mean...

I totally agree with Alessandro this is a serious missing feature for raster
layers other then photo and satellite imagery.

Barend
-- 
Barend Köbben
Senior Lecturer
ITC ­ University of Twente, Faculty of Geo-Information Science and
Earth Observation
PO Box 6, 7500AA Enschede, The Netherlands
+31 (0)53 4874253



On 23-03-10 21:40, "Markus Neteler" <neteler at osgeo.org> wrote:

> On Mon, Mar 22, 2010 Alessandro Sarretta wrote:
> ...
>> It seems that one of the main (in my opinion) enhancements needed still will
>> remain, and this is the lack of a legend for raster layers both in the Map
>> Legend and in the Map Composer.
>> Without it I can't create in QGIS any useful map containing raster layers
>> because I can't describe the meaning of the colours in the map. For vector
>> layer QGIS has a good ability to manage meaningful legends, for rasters
>> not...
> 
> Amusingly, during the hackfest, I proposed a similar thing (having the
> same problem):
> 
> http://trac.osgeo.org/qgis/ticket/2568
> "More predefined color tables for raster maps"
> 
> GRASS comes with a large number of predefined tables which could be
> recycled. They could be used as predefined tables to populate the colormap
> structure (so that the user can do further fine tuning if desired).
> 
> Three families of color tables are there
> - static (fixed values as for vegetation indices, celsius etc)
> - dynamic (given in percent like green-yellow-red, differences etc).
> - mixture of both.
> 
> I would welcome to be able to quickly assign a predefined color table
> after seeing (commonly) an all grey raster map when the used GeoTIFF
> (or whatever) file does not contain a color table.
> 
> Best
> Markus
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Faculty of Geo-Information Science and Earth Observation (ITC)
University of Twente

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