[GRASS-user] Extracting line heights from 3d vectors

GRASS GRASS user
1

Hi all,

I have a series of contour vector maps imported from a CAD program (Microstation). The CAD maps were in 3d, and the 3d information was successfully imported into GRASS, so the vectors have line heights as well as length, etc. Now I need to export these into shapefiles. When I do this, all the other useless CAD data like line color, style, weight, etc. is exported as attributes in the .dbf file, but line height is not -- it is not a field in the mySQL database but is part of the geometry of the line, if I understand what's going on here correctly. Is there a way to transfer line height into the attribute table so I can access and export it? Many thanks,

Nick Cahill
Dept. of Art History
UW-Madison

2

On 28/11/08 19:57, Nick Cahill wrote:

Hi all,

I have a series of contour vector maps imported from a CAD program (Microstation). The CAD maps were in 3d, and the 3d information was successfully imported into GRASS, so the vectors have line heights as well as length, etc. Now I need to export these into shapefiles. When I do this, all the other useless CAD data like line color, style, weight, etc. is exported as attributes in the .dbf file, but line height is not -- it is not a field in the mySQL database but is part of the geometry of the line, if I understand what's going on here correctly. Is there a way to transfer line height into the attribute table so I can access and export it?

v.to.db option=coor ?

Moritz