Dear all,
I need to convert some maps like Bmp & Jpeg format files into Shape(.Shp)
format on windows.
can you please suggest me any open source tool to convert into shape files.
Thanking you in advance,
Regards
Jeevan
--
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2008/8/27 Alpha GRASS <alpha.grass@gmail.com>:
Dear all,
I need to convert some maps like Bmp & Jpeg format files into Shape(.Shp)
format on windows.
errr....
Look, in GIS parlance, bmp and jpg are raster formats. Shapefile is a
vector format.
So, no direct "conversion" between those.
What you would do in a strict GIS environment, is to register
(georeference) those images and then digitize whatever is important to
a vector file.
can you please suggest me any open source tool to convert into shape files.
Most GISes, specially the free ones (GRASS/QGIS) allow you to load
those images and vectorize.
However, I remember seeing something about some program that allow you
to automagically vectorize a raster.
Doing a google search I found the program: http://potrace.sourceforge.net/
you can use it in Inkscape: http://wiki.inkscape.org/wiki/index.php/Potrace
the wikipedia also know something about it: http://en.wikipedia.org/wiki/Potrace
there are others:
http://delineate.sourceforge.net/download.html
While not answering exactly your question, that was the best i could
find in google.
Remember: google is your friend.
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc
Potrace + Inkscape sounds interesting. Just out of curiosity, does
anyone knows if it could be used to vectorize scanned topo sheets?
Daniel
On Wed, Aug 27, 2008 at 9:04 AM, Paulo Marcondes
<paulomarcondes@gmail.com> wrote:
2008/8/27 Alpha GRASS <alpha.grass@gmail.com>:
Dear all,
I need to convert some maps like Bmp & Jpeg format files into Shape(.Shp)
format on windows.errr....
Look, in GIS parlance, bmp and jpg are raster formats. Shapefile is a
vector format.
So, no direct "conversion" between those.What you would do in a strict GIS environment, is to register
(georeference) those images and then digitize whatever is important to
a vector file.can you please suggest me any open source tool to convert into shape files.
Most GISes, specially the free ones (GRASS/QGIS) allow you to load
those images and vectorize.
However, I remember seeing something about some program that allow you
to automagically vectorize a raster.Doing a google search I found the program: http://potrace.sourceforge.net/
you can use it in Inkscape: http://wiki.inkscape.org/wiki/index.php/Potracethe wikipedia also know something about it: http://en.wikipedia.org/wiki/Potrace
there are others:
http://delineate.sourceforge.net/download.htmlWhile not answering exactly your question, that was the best i could
find in google.Remember: google is your friend.
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc
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2008/8/27 Daniel Victoria <daniel.victoria@gmail.com>:
Potrace + Inkscape sounds interesting. Just out of curiosity, does
anyone knows if it could be used to vectorize scanned topo sheets?
if you have the sheets by "theme", that could work.
By theme, I mean separate rasters for contour, hydro, roads, etc...
That would be an interesting thing to test. How that would be imported
into grass is one thing I am not sure.
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc
There used to be the way by using Autotrace. You vectorized the raster to the dxf format and imported it into grass by v.in.dxf. The rasters I was working with used the same projection as my location. I just had to make a v.transform on them and voila.
Af far as it can be deduced from the homepage, Autotrace is not developed any more. The page, however, is still there and you can grab the sources. There seems to be a gui as well.
http://autotrace.sourceforge.net/
--- On Wed, 27/8/08, Paulo Marcondes <paulomarcondes@gmail.com> wrote:
From: Paulo Marcondes <paulomarcondes@gmail.com>
Subject: Re: [GRASS-user] How to convert BMP & JPEG files to Shape(.shp) format
To: "Daniel Victoria" <daniel.victoria@gmail.com>
Cc: "grassuser" <grass-user@lists.osgeo.org>
Date: Wednesday, 27 August, 2008, 10:10 PM
2008/8/27 Daniel Victoria <daniel.victoria@gmail.com>:
> Potrace + Inkscape sounds interesting. Just out of
curiosity, does
> anyone knows if it could be used to vectorize scanned
topo sheets?if you have the sheets by "theme", that could
work.
By theme, I mean separate rasters for contour, hydro,
roads, etc...That would be an interesting thing to test. How that would
be imported
into grass is one thing I am not sure.
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc
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Aplha:
>> I need to convert some maps like Bmp & Jpeg format files into
>> Shape(.Shp) format on windows.
>
> errr....
>
> Look, in GIS parlance, bmp and jpg are raster formats. Shapefile is a
> vector format. So, no direct "conversion" between those.
>
> What you would do in a strict GIS environment, is to register
> (georeference) those images and then digitize whatever is important
> to a vector file.
>
>> can you please suggest me any open source tool to
>> convert into shape files.
>
> Most GISes, specially the free ones (GRASS/QGIS) allow you to load
> those images and vectorize.
> However, I remember seeing something about some program that allow
> you to automagically vectorize a raster.
[autotrace et al.]
the "grass" way for this is documented here:
http://grass.osgeo.org/wiki/Trace_vector_contours_from_a_scanned_map
(isolate lines, then r.thin + r.to.vect)
Hamish