[GRASS-user] Question about the use of d.vect.thematic
Thomas.Adams at noaa.gov
Thu Mar 18 15:16:15 EDT 2010
I am trying to use d.vect.thematic to create a thematic map where the
vector polygons are filled with a color dependent on an attribute value,
swe, which is of type 'real'. I am using sqlite as the db driver. The
swe attribute was added to my vector map using v.db.join, which worked
fine. I can query the map and see that the swe values are correct.
However, when I use d.vect.thematic, I get the following error:
Column <swe> is of type <real> which is not numeric.
I don't understand; I guess there are subtle nuances with these data
type considerations which I don't yet appreciate. When I created my
sqlite db and table, should I have read-in the data as a different type?
If so, what?
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177
EMAIL: thomas.adams at noaa.gov
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