Hi,
I'm trying to use polygons with holes in another application that does not
support the concept of holes. So my idea is to split the polygons with holes
into a number of polygons, so that the same shape can be represented without
using holes.
Does GDAL have any functionality for this kind of p
OK, I will do that.
I had thought about that before, it is doesn't feel intuitive to read tens
of thousands of features from a layer and then just ignore/delete them. I
had hope that with the filter I could get better performance by not reading
them at all.
But it seems that's not how it works wi
> Only set the filter on the multipolygons layer.
But if I don't set any filter on the other layers I do get all other point
and line features (for example highway, etc). And I don't want them, I for
example only want landuse features. So I want no features to be returned
from layers that don't h
Even,
In my actual application I am looping over all layers, but it still doesn't
work.
But from your feedback I now know what is going wrong. My problem is what to
do with layers that don't contain the field I am filtering on. If I apply
the filter to them and error is thrown (ERROR 1: 'landuse'
Arno,
I have made a small sample to show my problem. It uses the same OSM file as
I mentioned above. Hopefully you can see what I did wrong from my code.
If I read the data in non-interleaved mode it all works fine, I find 298
features on the layer:
Ogr.RegisterAll();
Even,
No, this is not the same problem as before. With the changes we discussed
before I did get the filter to work perfectly. But now when I add the
do-while loop around it for the interleaved reading I get unexpected results
again.
I'll try to isolate the problem in a small sample program tonig
Thanks for the answer.
I do have a question about the interleaved mode. I have trouble to combine
it with the SetAttributeFilter command on a layer. I have the impression
that when the first "slice" of the interleaved reading doesn't contain any
features that match the filter, that the reading sto
Even,
Thanks for the quick reply and the quick fix.
I'm looking at implementing the interleaved reading in my code as well,
since some files throw an error with the normal reading mode. Are you saying
this issue will not happen with interleaved reading mode?
Arno
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Hi all,
I'm using the OGR libraries from a C# application to read OSM data. But I
have a problem now, with a certain file the reading of the features
"stalls". It seems GetNextFeature() never returns anything.
When I use ogrinfo -al on the same file it also seems to stall (probably at
the same po
Hi,
Yes, that is indeed what I meant. Sorry, couldn't explain it more clear.
This forum post shows a screenshot of how GlobalMapper updates the polygons
to remove the holes.
http://www.fsdeveloper.com/forum/showpost.php?p=613313&postcount=25
I have already implemented some logic that makes the
Hi all,
Does OGR have any build in functionality to convert features with holes into
features without holes? I don't mean delete the inner rings, but change the
geometry so that it covers the same area with only the outer ring.
I know GlobalMapper has such a function, but it would be useful if I
Thanks for checking, always good to understand why things happen as they do.
One of the workarounds will do for me, so I'll use them in my application.
Arno
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Sent from the GDA
Even,
Thanks for the quick answer.
I did some more testing. When using ogr2ogr it works fine indeed. When I use
the ExecuteSQL it also works fine. And it seems to only fail the second time
I call SetAttributeFilter.
Here is some test code I use:
using System;
using System.Collections.Generic;
u
Hello,
I'm using the GDAL/OGR libraries in a C# application and I have some trouble
with the SetAttributeFilter function on an OGR layer.
The filtering works fine when I load a SHP file, but when I load an OSM file
it doesn't work. I still get all the features on the layer. Is this a known
limita
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