[mapserver-users] msOGRFileNextShape(): OGR error. TopologyException: side location conflict

[Oliver Wesp]

Hi,

we recently struggled with exactely the same kind of errors
(TopologyException) when reading S57 data through ogr. We discovered
that the problem only occured when gdal/ogr was build against GEOS. We
rebuild without GEOS support and the TopologyExceptions dissapeard.

Best regards,
Oliver

2009/8/18 Daniel Morissette <dmorissette at mapgears.com>:
> Friend Vn 2000 wrote:
>>
>> I still get this error now ( I use MS4W v2.3.1 - mapserv 5.2.1 ).
>> My data source is a .mdb Personal Geodabase file. This is the first time I
>> use this kind for input. I found the map engine doesn't work stably and this
>> error appears frequently. Sometime the error not shown but some features in
>> the map disappear mysterious-ly.
>
> I see two possibilities: it is either a bug in the OGR driver for Personal
> Geodatabase, or the specific file you are trying to open does not have clean
> topology in it, but either way this is very unlikely to be a direct
> MapServer issue. The first thing you should do is ensure that the dataset
> has clean topology in it. I'm sorry, I don't know how to do that with recent
> versions of ESRI software, but I remember that in the days of Arc/Info 7.x
> you'd do a CLEAN/BUILD on your coverage to rebuild the topology.
>
> Once you are sure that the topology is valid, you could try running
> GDAL/OGR's "ogrinfo" or "ogr2ogr" utilities on your dataset, if it's a OGR
> driver problem then the utilities will probably produce the same errors, in
> which case your best bet would be to file a GDAL/OGR ticket with a dataset
> to reproduce the issue, so that the maintainer of the driver can have a look
> and see if something can be done about this issue.
>
> Daniel
> --
> Daniel Morissette
> http://www.mapgears.com/
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