The nice thing about a wiki is that one person can put some info in and another person can edit it to make corrections or improve the explanation.
Jerry ---- Original message ---- >Date: Tue, 17 Jul 2007 10:05:08 +0200 (CEST) >From: Juan Miguel Garijo <[EMAIL PROTECTED]> >Subject: Re: [GRASS-user] importing .dgn files in grass >To: [email protected] > > >--- nishith datta <[EMAIL PROTECTED]> escribió: > >> Thanks juan, >> You were a gr8 help. >> But one problem some of the layers have point & line >> both types of objects. >> How do I select one of the two and discrad the >> other....? >> Let us say the airfield layer has the points where >> the airfield are and the >> symbol which is >> made of arcs and has an aeroplane drawn. I donot >> want the symbol so I wish >> to extract only >> the points. I use v.extract. But how do I know which >> layer has what info and >> it is in what form - line, point or poly. If I donot >> know that how can I >> extract the relevant info.? Is it so that dgn files >> have layers by some >> protocol . where can I find that info. >> Sorry to bother you , but thought you may help me >> out. >> Thanks once again. >> nishith >> > >In the dgns I use always I find a combination of 2 >fields of those >Type : >Level : >GraphicGro : >ColorIndex : >Weight : >Style : >EntityNum : >MSLink : >Text : >enough for discrimination with clause "where Level=X >AND OtherField=Y" I d'ont know in yours. >The patient text with v.external is the only way I >know to look after the patterns used in map's >symbology. >I've never used the 'minimun size of areas to be >imported' in order to discard symbols. May be... >nor the flags 'point', 'boundary',... >Good luck, dgns are funny > >NOTE for Gerald Nelson: >I d'ont feel able to write FAQ because my English and >GRASS skills. >I have a set of exercises in Spanish of a course of >GIS with GRASS starting with dgns with copyright. If >someone is interested I can send it. > > > > > > > >______________________________________________ >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
