[GRASS-user] Raster color always white for null value

[Moritz Lennert]

Le 12 octobre 2016 06:43:17 GMT+02:00, NASAHARA Kenlo <24dakenlo at gmail.com> a écrit :
>Dear GRASS people
>
>I am using GRASS 7.0.4 on Ubuntu 14.04.
>
>I am trying to display a DSM map (ALOS AW3D) 
>whose null value covers ocean. I use an original
>color table like this:
>
>GRASS 7.0.4 (latlon):~/ > cat color_DSM.txt 
>-1000 black
>0     black
>100   white
>1000 white
>nv blue
>
>By running the following commands,
>GRASS 7.0.4 (latlon):~/ > d.mon start=wx0
>GRASS 7.0.4 (latlon):~/ > r.colors map=DSM rules=color_DSM.txt 
>Color table for raster map <DSM> set to 'color_DSM.txt'
>GRASS 7.0.4 (latlon):~/ > d.rast DSM
>
>I got the wx0 window with a greyscale topography as expected,
>but the ocean looks wite, not blue!
>
>I checked that the ocean was certainly covered by NULL (no value)
>by d.what.rast command and mouse clicks. I also checked the 
>file containing the color table info: ~/latlon/PERMANENT/colr/DSM
>% -1000 1000
>nv:0:0:255
>-1000:0 0:0
>0:0 100:255
>100:255 1000:255
>
>which looks OK for nv line.
>
>Do you know the reason? If you do, please help me!


Try d.rast with the -n flag.

Moritz

>
>-- 
>Kenlo Nishida Nasahara
>Faculty of Life and Environmental Sciences
>University of Tsukuba, Japan 305-8572
>24dakenlo at gmail.com
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