[GRASS-user] importing .dgn files in grass

[Gerald Nelson]

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 <saldinet at yahoo.es>  
>Subject: RE: [GRASS-user] importing .dgn files in grass  
>To: grassuser <grassuser at grass.itc.it>
>
>
>--- nishith datta <nkdiitd2002 at gmail.com> 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
>
>
>		
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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
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Urbana, IL 61801