[GRASSLIST:7106] Re: DXF to Grass dataset

[RAVI KUMAR]

Hi,
the import of DXF is not a problem and we have been doing it.
It is a WISH THAT
1. If the TEXT inside a polygon automatically becomes it's attribute after import into GRASS!!\\
It would save a lot of time.
May be the developers of GRASS may kindly consider this aspect.. in the next GRASS CVS release..
Ravi
Markus Neteler <neteler at itc.it> wrote:
I have tested the map with GRASS 6 (not knowing the
coordinate system):

v.in.dwg Geology.dxf out=geologydxf
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
MTEXT entity not supported
3555 elements processed
Building topology ...
3538 primitives registered
Building areas: 100%
0 areas built
0 isles built
Attaching islands:
Attaching centroids: 100%
Topology was built.
Number of nodes : 2581
Number of primitives: 3538
Number of points : 16
Number of lines : 3522
Number of boundaries: 0
Number of centroids : 0
Number of areas : 0
Number of isles : 0


The database contains now:
v.db.select geologydxf
cat|entity_nam|color|weight|layer|block|txt
1|POINT|256|-1|TICS||
2|POINT|256|-1|TICS||
3|POINT|256|-1|TICS||
4|POINT|256|-1|TICS||
5|POINT|256|-1|TICS||
6|POINT|256|-1|TICS||
7|POINT|256|-1|TICS||
8|POINT|256|-1|TICS||
9|POINT|256|-1|TICS||
10|POINT|256|-1|TICS||
11|POINT|256|-1|TICS||
12|POINT|256|-1|TICS||
13|POINT|256|-1|TICS||
14|POINT|256|-1|TICS||
15|POINT|256|-1|TICS||
16|POINT|256|-1|TICS||
17|LINE|256|-1|GELI236||
18|LINE|256|-1|GELI236||
19|LINE|256|-1|GELI236||
20|LINE|256|-1|GELI236||
21|LINE|256|-1|GELI236||
22|LINE|256|-1|GELI236||
23|LINE|256|-1|GELI236||
24|LINE|256|-1|GELI236||
...
3536|LINE|256|-1|GELI236||
3537|LINE|256|-1|GELI236||
3538|LINE|256|-1|GELI236||

I don't know if this is what you expected but to some extent
you can import the DXF file.

Regards

Markus Neteler

On Thu, Jun 09, 2005 at 05:57:04AM -0700, RAVI KUMAR wrote:
> Hi,
> Iam attaching a small 1:50000 scale geological map,
> which is scanned and vectorised manually by a
> draftsman.
> 
> When this is imported into ARC-INFO, the inscribed
> text in each Geological polygon becomes its attribute.
> 
> This is a very quick method, 
> 1. where all the digitization is done by the not so 
> computer savvy draftsmen
> 2. Then the Geologist imports it into ARC-INFO to
> convert into a digital data with a vital link
> attribute.
> 3. The geologist then attaches an external database
> table using this link attribute.
> 
> If U can make such a thing possible in grass, then we
> can use OGLed Qcad on linux, for the draftsmen and
> GRASS for the Geologists.
> Ravi
> 
> --- Markus Neteler wrote:
> 
> > Hi Ravi,
> > 
> > could you send (offlist) a small DXF sample file to
> > me?
> > Then I can check for the attributes in v.in.dwg.
> > 
> > Markus
> > 
> > On Wed, Jun 08, 2005 at 04:56:51AM -0700, RAVI KUMAR
> > wrote:
> > > Hi All,
> > > recently we completed a Geological digital dataset
> > in
> > > ARC-INFO.
> > > The steps in short are
> > > 
> > > 1. SCAN the map into and image
> > > 2. Draw polygons of various geological units with
> > the
> > > image of the map in the background (using Autocad)
> > > 3. The polygons of individual units have an
> > inscribed
> > > text indicating the geology and save as a DXF file
> > > 4. Import the resultant DXF file into ARC-INFO.
> > > 5. ARC-INFO automaticall takes the inscribed text
> > in
> > > each polygon as an attribute for that polygon.
> > > 
> > > Using DXF import software GRASS is able to get all
> > the
> > > vectors, but IF THE INSCRIBED TEXT OF EACH POLYGON
> > > BECOMES AN ATTRIBUTE then it will be far simpler
> > to
> > > make a GRASS dataset.
> > > 
> > > WHY USE AUTOCAD AND WHY NOT DO THE ENTIRE THING IN
> > > GRASS??
> > > 
> > > FOSS software 'Qcad', can be used instead of
> > AUTOCAD,
> > > and the CAD Draftsmen with limited knowledge can
> > make
> > > the vector of a geological map after scanning,
> > with
> > > inscribed text in each geological unit represented
> > as
> > > a polygon.
> > > 
> > > If GRASS then can import the resultant DXF file
> > from
> > > Qcad, and make the inscribed text as its
> > attribute, it
> > > can speedup the process of making digital
> > datasets.
> > > 
> > > Hope the GRASS program builders can give a
> > solution,
> > > like this.
> > > 
> > > Thanking in anticipation
> > > Ravi 
> > > 
> > > 
> > > 
> > > 
> > > __________________________________ 
> > > Do you Yahoo!? 
> > > Yahoo! Mail - Find what you need with new enhanced
> > search. 
> > > http://info.mail.yahoo.com/mail_250
> > 
> > -- 
> > Markus Neteler 
> > http://mpa.itc.it
> > ITC-irst - Centro per la Ricerca Scientifica e
> > Tecnologica
> > MPBA - Predictive Models for Biol. & Environ. Data
> > Analysis
> > Via Sommarive, 18 - 38050 Povo
> > (Trento), Italy
> > 
> 
> 
> 
> __________________________________ 
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-- 
Markus Neteler http://mpa.itc.it
ITC-irst - Centro per la Ricerca Scientifica e Tecnologica
MPBA - Predictive Models for Biol. & Environ. Data Analysis
Via Sommarive, 18 - 38050 Povo (Trento), Italy

		
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