RE: [GRASS-user] importing .dgn files in grass

GRASS GRASS user
1

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@yahoo.es>
Subject: RE: [GRASS-user] importing .dgn files in grass
To: grassuser <grassuser@grass.itc.it>

--- nishith datta <nkdiitd2002@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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