Hi, I have to vector maps, which describe the same area. But in some parts they deviate from each other. Is there any possiblity in Grass to find out the mean, maximum and minimum deviation? Andi -- "Feel free" - 10 GB Mailbox, 100 FreeSMS/Monat ... Jetzt GMX TopMail testen: http://www.gmx.net/de/go/topmail?ac=OM.GX.GX003K11713T4783a