[gdal-dev] [GRASS-user] r.out.gdal export with color table for floating-point values

[Otto Dassau]

Hi,

fowarded from grass list, because it is probably better here with some
additional notes:

I used Float32 as data type for the export to ERDAS Img, so the data a
floating point and there is a color table but the colortable does not reflect
the floating point data.

Color Table (RGB with 174 entries)
    0: 0,191,191,255
    1: 58,151,105,255
    2: 59,152,105,255
    3: 60,153,105,255
    4: 61,154,105,255
    5: 62,155,104,255
    6: 64,156,104,255

Is it possible somehow to adjust the colortable after the GRASS export to get
a color table that distinguishes floating point values as it does in GRASS? 

thanks a lot
  Otto

Am Fri, 22 Jul 2011 09:18:53 +0200
schrieb Otto Dassau <dassau at gbd-consult.de>:

> Hi,
> 
> I have an elevation map in GRASS with a color table that distinguishes
> decimal values based on the srtm color table, see below. I only want to
> have the value 0 in aqua, and all values <> 0 shall reflect land below or
> above sea level. 
> 
> -10  57 151 105
> -0.000001 57 151 105
> 0 aqua
> 0.000001  57 151 105
> 50   117 194 93
> 100  230 230 128
> 200  202 158 75
> 
> When I export the raster with r.out.gdal (nor now I used GeoTiff and ERDAS
> Img) the color table seems to be changed to reflect "only" integer values.
> so all 0 floating point values are displayed as aqua.
> 
> Is there a solution for this? 
> 
> Thanks a lot
>  Otto