Dear GRASS-users,
I am experiencing some trouble with extracting (and/or displaying) a
vector layer, based on a 2nd database connection (GRASS 6.3svn,
PostgreSQL 8.26). Viewing the output from v.extract, it can be seen
that the table connection is correctly recognised and a sql-selection
is performed without errors. Nevertheless, the topology of the new
output vector generated indicates that there are any vector elements
(see example 1). The same command, but referred to the 1st database
table (the original one) gives a correct output vector layer (see
example 2).
Both associated tables have the same identifier column (cat), defined
as primary key and index column in PostgreSQL. The v.info command
shows, that both tables are apparently well connected to the vector
layer.
Any ideas about what is going wrong? Thanks for any advice.
Kind regards,
Guido Lorenz
example 1:
v.extract [EMAIL PROTECTED] output=test5
type=point,line,boundary,centroid,area,face layer=2 new=-1 {where=cat > 1}
--overwrite
log:
Vector map <test5> already exists and will be overwritten
Load categories from the database (table = geo.test3, db = soils2006).
40 categories loaded from the database
Building topology ...
Registering lines:
0 primitives registered
Building areas:
0 areas built
0 isles built
Attaching islands:
Attaching centroids: Topology was built.
Number of nodes : 0
Number of primitives: 0
Number of points : 0
Number of lines : 0
Number of boundaries: 0
Number of centroids : 0
Number of areas : 0
Number of isles : 0
Writing attributes...
v.extract [EMAIL PROTECTED] output=test5
type=point,line,boundary,centroid,area,face layer=1 new=-1 {where=cat > 1}
--overwrite
log:
Vector map <test5> already exists and will be overwritten
Load categories from the database (table = geo.vu_transectas_r2, db =
soils2006).
40 categories loaded from the database
Building topology ...
Registering lines:
40 primitives registered
Building areas:
0 areas built
0 isles built
Attaching islands:
Attaching centroids:
Topology was built.
Number of nodes : 40
Number of primitives: 40
Number of points : 40
Number of lines : 0
Number of boundaries: 0
Number of centroids : 0
Number of areas : 0
Number of isles : 0
Writing attributes...
Layer 1
Done
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