[GRASS-user] confused by v.out.ogr

[Robert Nuske]

Hi,

exporting a vector layer (53 polygons with 7 islands) into shapefile format, I 
found mysterious numbers of features written.

If I am writting the polygons without islands I get the expected 53 features. 
But if I am asking for the islands as well, I get (53 + 2*7) features. Which 
is 53 polygons + 7 islands + 7 doubled polygons.

Am I doing something wrong? 
Do I have a strange Grass Vector Layer?
Is this done on purpose? 

Cheers,
  robert



Examples:

$ v.info grassVector
...
Number of points:       0               Number of areas:      60
Number of lines:        0               Number of islands:    60
Number of boundaries:   60              Number of faces:      0 
Number of centroids:    53              Number of kernels:    0 
...

$ v.out.ogr -c in=grassVector type=area dsn=. olayer=shpVector
Exporting 60 areas (may take some time) ...
 100%
53 features written
WARNUNG: 7 features found without category skip

v.out.ogr in=grassVector type=area dsn=. olayer=shpVector
Exporting 60 areas (may take some time) ...
 100%
67 features written
WARNUNG: 7 features without category written


looking at the resulting shpVector.dbf shows that polygons are doubled before 
and after an island

cat value label
...
9   1     1
0   0
9   1     1