iomeneandrei aborruso at tin.it writes:
Hi all,
is there in OGR a command that I can use to convert multipart polygons in
singleparts?
If it does not matter to use some other tool than OGR, OpenJUMP can explode
multifeatures and geometry collections. I made a little test and it correctly
Hi Jukka,
thank you for your time and for your advice.
Rahkonen Jukka wrote:
If it does not matter to use some other tool than OGR, OpenJUMP can
explode
multifeatures and geometry collections.
My goal is to make this transformation in Python, and I did not want to
write either unnecessary
My goal is to make this transformation in Python, and I did not want to
write either unnecessary code or complicated code (for me).
If I have a solid and interesting result, I will publish it here.
Ciao Andrea
this code will do the trick (note that it will create a polygon for
each ring, so
Caro Paolo,
Paolo Corti wrote:
Ciao Andrea
this code will do the trick (note that it will create a polygon for
each ring, so you will get a polygon for each hole as well)
[...]
writing in groups like this is always a surprise and a great pleasure. Thank
you, thank you, thank you.
I have
I have modified a little your code - https://gist.github.com/735330 - and I
have this message:
Polygon added.
Traceback (most recent call last):
File PaoloIsGreat.py , line 32, in module multipoly2poly(in_lyr,
out_lyr)
File PaoloIsGreat.py , line 8, in multipoly2poly for geom_part in
Hi Even,
Even Rouault wrote:
Geometry have been made iterable only since GDAL 1.7.0. You need to
upgrade
your GDAL version or modify a bit the script to make the iteration with
the
OGR API.
instead of :
for geom_part in geom:
addPolygon(geom_part.ExportToWkb(), out_lyr)
Hi Andrea,
Just a note of warning:
if you have a point x,y that is inside the hole (so it doesn't belong the
the polygon), and you run some point in polygon query (intersection for
example) you will get that it is no part of any polygon but if you
convert the ring in two polygons using this
Hi Frank,
Frank Warmerdam wrote:
Reviewing the ogr2ogr code I see this does trigger a call to
forceToPolygon()
though *mostly* it exists to set the type of the created layer. So, yes,
-nlt polygon with ogr2ogr may well do what you want.
I have used this GML file as input:
On 10-12-07 03:43 AM, iomeneandrei wrote:
Hi Frank,
Frank Warmerdam wrote:
Reviewing the ogr2ogr code I see this does trigger a call to
forceToPolygon()
though *mostly* it exists to set the type of the created layer. So, yes,
-nlt polygon with ogr2ogr may well do what you want.
I have
Dear Frank,
Frank Warmerdam wrote:
I tried it with a trunk build and the multipolygon is converted to a
polygon.
I suspect the feature of the forcing support is new and if you want it you
would need a reasonably recent development build - more recent than
FWTools.
I have downloaded
On 10-12-07 02:48 PM, iomeneandrei wrote:
I have downloaded GDAL 1.7.3 from here http://vbkto.dyndns.org/sdk/, and I
have made a test. The output file now does not contain ever MultiPolygon,
but it has only Polygon. And I have made this test using two output formats:
SQLite and GML. This is a
Hi Frank,
Frank Warmerdam wrote:
At the API or scripting level there is the
OGRGeometryFactory::forceToPolygon()
method to try and convert a multipolygon to a simple polygon.
I will try using OGR API. I will be slow, but I hope I'll be able to do it.
Thank you very much,
a
-
Hi Frank,
Frank Warmerdam wrote:
I am not aware of a way to do this from the commandline utilities.
could I use the -nlt parameter of ogr2ogr and force POLYGON? If no, what's
the power of -nlt parameter?
Once again, thank you,
a
-
Andrea Borruso
On 10-12-06 06:13 PM, iomeneandrei wrote:
Hi Frank,
Frank Warmerdam wrote:
I am not aware of a way to do this from the commandline utilities.
could I use the -nlt parameter of ogr2ogr and force POLYGON? If no, what's
the power of -nlt parameter?
Andrea,
Reviewing the ogr2ogr code I see
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