On 04/04/12 14:50, RichardC wrote:
Hi,
I'm trying to join vector layers using v.patch and run into the 'column
types differ' error.
I can see the difference relating to the data type of a column via the
attribute table in GRASS. However, is there a way through GRASS that I can
modify the data type?
I've tried opening the DBF file in openoffice, but after saving the changes
they seem to be lost on reopening the DBF file. I've also unchecked
sheet/document protection in openoffice. Have also tried exporting as CSV
and reimporting and saving as DBF in openoffice.
Would welcome any suggestions on the simplest approach. QGIS also does not
appear to allow changing of data type through its GUI interface.
The easiest would probably be to create new columns of the desired type
(with v.db.addcolumn) and to copy the data from the old columns into the
new columns, for example with v.db.update qcol=.
Moritz
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