This looks like an excellent addition to the Grass FAQ at the grass website. Any chance you could put something there?
Jerry ---- Original message ---- >Date: Wed, 11 Jul 2007 08:04:53 +0200 (CEST) >From: Juan Miguel Garijo <[EMAIL PROTECTED]> >Subject: RE: [GRASS-user] importing .dgn files in grass >To: grassuser <[email protected]> > > >--- nishith datta <[EMAIL PROTECTED]> escribió: > >> hi all >> I have been able to import a dgn file into grass >> using the v.in.ogr but I >> have all the point, line and poly >> features in the same layer. Next When i use v.what >> then I get a attribute >> listing which I can't quite understand >> Anyone who can help me out with - how to seperate >> the point , lines and >> polys into three different layers. Also >> if possible there could be different things >> represented as lines - roads and >> rivers both are line features. So how to extract >> these from the .dgn file >> into two different layers. I am attaching the output >> of v.what command for >> ease of anyone who wishes to help me out. >> Output of Grass v.what command :- >> >> East: -21786.9555969 >> North: -23164.1739966 >> Map: nkd >> Mapset: PERMANENT >> Point >> >> Layer: 1 >> Category: 9362 >> driver: dbf >> database: >> /ramdisk/grass/locations/43p/PERMANENT/dbf/ >> table: nkd >> key column: cat >> cat : 9362 >> Type : 17 >> Level : 3 >> GraphicGro : 0 >> ColorIndex : 0 >> Weight : 1 >> Style : 0 >> EntityNum : >> MSLink : >> Text : Paswal >> >> When I try to see the layers in the .dgn file using >> the option list >> available layers in the dataset and exit from >> v.in.ogr >> I get the output >> Data source contains 1 layers: >> elements >> >> But I think the data source contains more than one >> layer - atleast one line, >> one point and one poly for sure. What is the meaning >> of the above >> output..... >> >> >> >> Thanks in advance. >> Nishith > > >GRASS Layer, is not the same of dgn's Layer(Level) > >Make a external database conection: > >v.external dsn=yourmap.dgn output=yourmap > >open yourmap in a monitor > >You can test every entity in the dgn with v.what > >Make attention on the Level value, and others fields >values of the entities you want to include in a vector >GRASS file. > >Import just this entities with the the option >"where=": > >v.in.ogr -z -o dsn=yourmap.dgn output=yourmapX >where=Level=X min_area=0.0001 snap=-1 > >And so on for each map > >Juan M. Garijo > > > >______________________________________________ >LLama Gratis a cualquier PC del Mundo. >Llamadas a fijos y móviles desde 1 céntimo por minuto. >http://es.voice.yahoo.com > >_______________________________________________ >grassuser mailing list >[email protected] >http://grass.itc.it/mailman/listinfo/grassuser Gerald Nelson Professor, Dept. of Agricultural and Consumer Economics University of Illinois, Urbana-Champaign office: 217-333-6465 cell: 217-390-7888 315 Mumford Hall 1301 W. Gregory Urbana, IL 61801 _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
