[GRASS-dev] [GRASS GIS] #1124: v.to.rast inconsistency in importing label

GRASS GRASS developer
1

#1124: v.to.rast inconsistency in importing label
----------------------+-----------------------------------------------------
Reporter: cmbarton | Owner: grass-dev@…
     Type: defect | Status: new
Priority: major | Milestone: 6.4.0
Component: Raster | Version: svn-develbranch6
Keywords: | Platform: All
      Cpu: All |
----------------------+-----------------------------------------------------
We just ran into a strange inconsistency in the behavior of v.to.rast.
This happens if you are trying to use vector attributes to populate the
cat and label fields of a new raster.

If you have a float (double precision) attribute to use for the raster cat
and string attribute to use for the raster label, the float is imported
into the raster cat fine. But the string is imported from the vector
attribute to the raster label ONLY if the value in the corresponding
attribute to use for the cat has no decimals. For example:

here is a vector attribute table with 2 attributes and 4 records:

{{{
float_attr str_attr
========= =======
1.5 "first line"
2 "second line"
2.5 "third line"
3 "fourth line"
}}}

v.to.rast is run as follows:

v.to.rast input=vectorfile output=newraster use=attr type=point
column=floatattr labelcolumn=strattr

The result is that raster cells with values 2 and 3 have labels, but the
cells with values 1.5 and 2.5 do not have labels.

--
Ticket URL: <https://trac.osgeo.org/grass/ticket/1124&gt;
GRASS GIS <http://grass.osgeo.org>

2

#1124: v.to.rast inconsistency in importing label
----------------------+-----------------------------------------------------
Reporter: cmbarton | Owner: grass-dev@…
     Type: defect | Status: new
Priority: major | Milestone: 6.4.0
Component: Raster | Version: svn-develbranch6
Keywords: | Platform: All
      Cpu: All |
----------------------+-----------------------------------------------------

Comment(by hamish):

see also #175, "`v.to.rast labelcol= SegFaults and ignored`".

Hamish

--
Ticket URL: <http://trac.osgeo.org/grass/ticket/1124#comment:1&gt;
GRASS GIS <http://grass.osgeo.org>

3

#1124: v.to.rast inconsistency in importing label
-----------------------+----------------------------------------------------
Reporter: cmbarton | Owner: grass-dev@…
     Type: defect | Status: new
Priority: major | Milestone: 6.4.0
Component: Raster | Version: svn-develbranch6
Keywords: v.to.rast | Platform: All
      Cpu: All |
-----------------------+----------------------------------------------------
Changes (by hamish):

  * keywords: => v.to.rast

--
Ticket URL: <http://trac.osgeo.org/grass/ticket/1124#comment:2&gt;
GRASS GIS <http://grass.osgeo.org>

4

#1124: v.to.rast inconsistency in importing label
-----------------------+----------------------------------------------------
Reporter: cmbarton | Owner: grass-dev@…
     Type: defect | Status: new
Priority: major | Milestone: 6.4.0
Component: Raster | Version: svn-develbranch6
Keywords: v.to.rast | Platform: All
      Cpu: All |
-----------------------+----------------------------------------------------

Comment(by cmbarton):

Replying to [comment:1 hamish]:
> see also #175, "`v.to.rast labelcol= SegFaults and ignored`".
>
>
> Hamish

This does indeed look suspicious and possibly related.

Michael

--
Ticket URL: <https://trac.osgeo.org/grass/ticket/1124#comment:3&gt;
GRASS GIS <http://grass.osgeo.org>