[GRASS-user] importing .dgn files in grass

--- nishith datta <nkdiitd2002@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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