[GRASS-user] Raster Mask under version 7 causes map to go white

[cboscari at sbcglobal.net]

From the documentation, I understood 0 is one form of the NULL representation for the mask, with other values representing non-masked areas. 


“Grid cells in the MASK map containing 0 or NULL will replace data with NULL, while cells containing other values will allow data to pass through unaltered. ”






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From: jctorres
Sent: ‎Friday‎, ‎June‎ ‎20‎, ‎2014 ‎1‎:‎01‎ ‎AM
To: Christopher Boscarino, grass-user at lists.osgeo.org






"The mask is just 0 and 1’s"
you must use null and non null



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El 20 de junio de 2014 09:33:34 <cboscari at sbcglobal.net> escribio:


I am not sure what you mean by “query” the map- under 6.4.3, when I open my map with the mask file in my mapset, the map raster appears with the sections I want visible, the sections I don’t want are not visible and excluded from calculations. This is I think the expected behavior?

Under the beta 2 in both Windows and Linux (Ubuntu Trusty) I have tried changing the color table on the underlying map raster  but get the same result- opening the raster with the mask present in the mapset blanks out everything, removing the mask displays the entire raster. The color table I’m using is greyscale. The mask is just 0 and 1’s, but I tried changing the color table there, no difference. If I delete the mask file, the entire underlying raster is displayed. 

I verified the mask does contain both 0’s and 1’s, and like I said, it does work fine under 6.4.

So I am stumped. 

Chris






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From: Markus Neteler
Sent: ‎Thursday‎, ‎June‎ ‎19‎, ‎2014 ‎10‎:‎21‎ ‎PM
To: Christopher Boscarino
Cc: grass-user at lists.osgeo.org





Chris,

On Thu, Jun 19, 2014 at 3:32 AM,  <cboscari at sbcglobal.net> wrote:
> Hi Everyone,
>
> I am having an issue that I can’t seem to resolve using the beta2 version
> under both Windows or Linux, as well as daily snapshots  under the Ubuntu
> version.
>
> Basically, a raster mask file that I am using under the current version of
> grass 7 beta  “blanks” out the underlying raster- that is the entire display
> area is white, although both rasters (my raster map and the mask) appear as
> layers. If I remove the mask, the map area is again entirely visible.

Did you actually query the map(s)?

> It worked correctly back in December with the stable version as well as the
> snapshot of version 7 (then). Now the mask only works under 6.4.
> I am have looked on the website and the documentation to see if there were
> any changes made to raster masks, but am unable to find any changes.

The raster mask management is pretty much the same for years.

Perhaps it is just related to the color table you use?

Markus
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