[GRASS-user] importing .dgn files in grass

[Gerald Nelson]

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 <saldinet at yahoo.es>  
>Subject: Re: [GRASS-user] importing .dgn files in grass  
>To: grassuser at grass.itc.it
>
>
>--- nishith datta <nkdiitd2002 at gmail.com> 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.
>
>
>
>
>	
>	
>		
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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