The postgres table with station data has data type varchar(12) for the
column named bin_col but grass apparently doesn't see this:
# \d stations
...
bin_col | character varying(12)
# select bin_col from stations limit 3;
bin_col
----------
0:231:57
0:231:57
0:231:57
(3 rows)
v.colors -c map=stations use=attr column=site_nbr rgb_col=bin_col --o
Writing color rules...
ERROR: Data type of RGB column <bin_col> must be char
Where have I made the syntactical mistake?
TIA,
Rich
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