[GRASS-dev] [GRASS GIS] #3248: v.external: mixed up IDs from PostGIS tables

GRASS GIS trac at osgeo.org
Tue Jan 10 01:57:06 PST 2017

#3248: v.external: mixed up IDs from PostGIS tables
 Reporter:  sbl          |      Owner:  grass-dev@…
     Type:  defect       |     Status:  new
 Priority:  normal       |  Milestone:  7.2.1
Component:  Vector       |    Version:  7.0.5
 Keywords:  v.external   |        CPU:  Unspecified
 Platform:  Unspecified  |
 I tried to link a PostGIS table to GRASS GIS 7 for point sampling using
 v.external (in GRASS 7.0.6 and GRASS 7.2.1svn).

 With that linked layer (which is not in public schema and has column
 "point_id" as primary key) I get a lot of:

 WARNING: No record for category XXXX in table


 when I use v.what.rast on that layer.

 The results suggest that not the proper IDs were used when values were
 loaded to attribute table. Because values in the attribute table of the
 points do not match with values in the raster at point locations.
 Furthermore, some points, which are supposed to have values in the
 attribute table, have none...

 With the attaced data, the issue can be reproduced like this:
 ogr2ogr -f PostgreSQL "PG:dbname=gisdata schemas=myschema" points.sqlite
 v.external --overwrite input=PG:dbname=gisdata layer=myschema.points
 output=points_pg -o
 g.region -p -a vector=points res=250
 r.random.surface --overwrite --verbose output=rand
 v.what.rast map=points_pg raster=rand column=morphology

 Linking the SQLite data source however seems to work fine. No errors for:
 v.external --overwrite input=points.sqlite layer=myschema.points
 output=points_sqlite -o
 v.what.rast map=points_sqlite raster=rand column=morphology

 This is my PostGIS / GRASS environment:

 PostgreSQL 9.5.2 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu
 4.8.2-19ubuntu1) 4.8.2, 64-bit
 POSTGIS="2.2.2 r14797"
 GEOS="3.5.1-CAPI-1.9.1 r4171"
 PROJ="Rel. 4.9.2, 08 September 2015"
 GDAL="GDAL 2.0.3, released 2016/07/01"

 For discussion see: https://lists.osgeo.org/pipermail/grass-

Ticket URL: <https://trac.osgeo.org/grass/ticket/3248>
GRASS GIS <https://grass.osgeo.org>

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