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
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WHY USE AUTOCAD AND WHY NOT DO THE ENTIRE THING IN
GRASS??
why indeed.
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.
You can use existing tools for the job. i.e. QGis's grass vector
digitizer or 'v.digit bgcmd=d.rast ..'.
Hi Hamish,
Text drawn inside a polygon (inscribed text) in a DXF
file
Imported in GRASS should be taken as THE POLYGON'S
ATTRIBUTE
IS THIS POSSIBLE IN GRASS6 NOW?
If, S, may be i need to know some commands prompted.
Thanks in anticipation
Ravi
--- Hamish <hamish_nospam@yahoo.com> wrote:
> WHY USE AUTOCAD AND WHY NOT DO THE ENTIRE THING IN
> GRASS??
why indeed.
> 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.
You can use existing tools for the job. i.e. QGis's
grass vector
digitizer or 'v.digit bgcmd=d.rast ..'.
Hamish
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Text drawn inside a polygon (inscribed text) in a DXF
file
Imported in GRASS should be taken as THE POLYGON'S
ATTRIBUTE
IS THIS POSSIBLE IN GRASS6 NOW?
oh I see what you mean. They are vector lines shaped like letters - not
text strings - embedded in the file. Knowing little about DXF, I'll go
out on a limb and say that is hard to the point of "no".
> Text drawn inside a polygon (inscribed text) in a
DXF
> file
> Imported in GRASS should be taken as THE POLYGON'S
> ATTRIBUTE
>
> IS THIS POSSIBLE IN GRASS6 NOW?
oh I see what you mean. They are vector lines shaped
like letters - not
text strings - embedded in the file. Knowing little
about DXF, I'll go
out on a limb and say that is hard to the point of
no.
Did I understand correctly?
NO .. The are text and not lines drawn as text...
When U import a DXF file with a polygon
with an enclosed TEXT.. ARC-INFO makes the polygon
with THAT Text attribute..
IF THIS IS POSSIBLE IN grass THEN IT WILL QUICKEN
MAKING DIGITAL MAPS.
Ravi
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I think v.in.dxf was set up this way in Grass 3 or 4, wasn't it? You would put a text object near a vector (contour line, etc.) and grass would make this text the attribute of the imported vector.
Nick Cahill
On Jun 8, 2005, at 3:32 PM, RAVI KUMAR wrote:
Hi Hamish,
Text drawn inside a polygon (inscribed text) in a DXF
file
Imported in GRASS should be taken as THE POLYGON'S
ATTRIBUTE
IS THIS POSSIBLE IN GRASS6 NOW?
If, S, may be i need to know some commands prompted.
Thanks in anticipation
Ravi
--- Hamish <hamish_nospam@yahoo.com> wrote:
WHY USE AUTOCAD AND WHY NOT DO THE ENTIRE THING IN
GRASS??
why indeed.
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.
You can use existing tools for the job. i.e. QGis's
grass vector
digitizer or 'v.digit bgcmd=d.rast ..'.
Hamish
__________________________________
Discover Yahoo!
Use Yahoo! to plan a weekend, have fun online and more. Check it out! http://discover.yahoo.com/
I think v.in.dxf was set up this way in Grass 3 or 4, wasn't it? You would put a text object near a vector (contour line, etc.) and grass would make this text the attribute of the imported vector.
Yes the functionality has been in GRASS for many years AFAIK. The relevant module is v.cadlabel. It needs to be run after import with v.in.dxf. A few years ago I was working with a DXF file and could have done with this functionality, but I wasn't aware of it then and have never used it
so can't offer any help. But v.cadlabel is still there in 5.4.
I want to classify an ortho-photo I have rectified with i.orthophoto.
I directly rectified the image i have made with r.composite from the 3 r/g/b raster obtained from a tiff import.
So into the target location i have only 1 file to classify but the command ask me for more one file. How can i do to use the i.cluster command also with only one raster to classify? Is possible to do what i said?