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).
<br>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_ ).<br>Thanks for your interest and sorry for not testing my problem deeper before asking help from the forum
<br><br>MIck<br><br><div><span class="gmail_quote">2007/2/19, Hamish <<a href="mailto:hamish_nospam@yahoo.com">hamish_nospam@yahoo.com</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Michaël Rabotin wrote:<br>> Hi everybody, in grass 6.2.1 on fedora 6,<br>> with driver dbf,<br>> I use the command v.overlay (operator=and between 2 polygons maps),<br>> and on the output map, all the column with text are transformed on
<br>> numeric value. Doesn't anybody know what happened (is this a pb with<br>> the driver dbf) ?<br><br><br>column names from map "A" are prefixed by "a_" and column names from map<br>"B" are prefixed by "b_" ? column types should stay the same.
<br><br><br>Hamish<br></blockquote></div><br><br clear="all"><br>-- <br>M.