[GRASS-user] bug v.overlay driver dbf ?

GRASS GRASS user
1

Hi everybody, in grass 6.2.1 on fedora 6,
with driver dbf,
I use the command v.overlay (operator=and between 2 polygons maps), and on the output map, all the column with text are transformed on numeric value.
Doesn’t anybody know what happened (is this a pb with the driver dbf) ?
Thanks

Mick

–
M.

2

Michaël Rabotin wrote:

Hi everybody, in grass 6.2.1 on fedora 6,
with driver dbf,
I use the command v.overlay (operator=and between 2 polygons maps), and on
the output map, all the column with text are transformed on numeric value.
Doesn't anybody know what happened (is this a pb with the driver dbf) ?

I've been using v.overlay and DBF driver recently in GRASS 6.3 and I
haven't had such problems. Can you be more specific, or at best -
reproduce the problem with Spearfish data?

Maciek

3

Michaël Rabotin wrote:

Hi everybody, in grass 6.2.1 on fedora 6,
with driver dbf,
I use the command v.overlay (operator=and between 2 polygons maps),
and on the output map, all the column with text are transformed on
numeric value. Doesn't anybody know what happened (is this a pb with
the driver dbf) ?

column names from map "A" are prefixed by "a_" and column names from map
"B" are prefixed by "b_" ? column types should stay the same.

Hamish

4

Sorry everybody, the problem was with the columns of my first input map. When I saw the columns of the output map (after v.overlay) with open office, It was ok but when I use v.db.select to see the dbf table on GRASS, the text value in the CHARACTER columns was remplaced by numeric value (but these values were values of a precedent numeric column).
I make a new test with an input map whose name columns were simplified and it works fine. Maybe the problem was the name of columns (I’ve got a column whose name was b_ALP_ ).
Thanks for your interest and sorry for not testing my problem deeper before asking help from the forum

MIck

2007/2/19, Hamish <hamish_nospam@yahoo.com>:

Michaël Rabotin wrote:

Hi everybody, in grass 6.2.1 on fedora 6,
with driver dbf,
I use the command v.overlay (operator=and between 2 polygons maps),
and on the output map, all the column with text are transformed on
numeric value. Doesn’t anybody know what happened (is this a pb with
the driver dbf) ?

column names from map “A” are prefixed by “a_” and column names from map
“B” are prefixed by “b_” ? column types should stay the same.

Hamish

–
M.