AW: [gdal-dev] Identification of neighbouring OGRGeometries

[Alexander Plum]

Hi,

first of all I'm collecting OGRGeometries from OGRFeatures. The OGRFeatures exist in a OGRLayer in which the function 'GDALContourGenerate' has written.
I put these OGRGeometries (these geometries should later be painted) into a std::vector. Before putting the next OGRGeometry into this vector it shall be checked
which neighbouring OGRGeometries the current OGRGeometry possesses. But I do not know how I get these (two) neighbouring OGRGeometries.
Later on the distance to both OGRGeometries shall be calculated with help of the function 'OGR_G_Distance'. If the distance is too small the current OGRGeometry will not be put
into the vector collecting OGRGeometries.

I hope you can get me and thanks for your support,

Alex
________________________________________
Von: Chaitanya kumar CH [chaitanya.ch at gmail.com]
Gesendet: Mittwoch, 7. Juli 2010 20:05
An: Alexander Plum
Betreff: Re: [gdal-dev] Identification of neighbouring OGRGeometries

Alex,

Can you explain me what 'highline' means?

On Wed, Jul 7, 2010 at 5:01 PM, Alexander Plum <Alexander.Plum at cae.de<mailto:Alexander.Plum at cae.de>> wrote:
Look,

I am working on a function which paints OGRGeometries representing highlines.
Before painting them I want to make sure wether the new OGRGeometry should be painted or not. If the distance to the two neighbours is too near to its both neighbours, the
new highlinie should not be painted. I am looking foward to employ the function OGR_G_Distance() for this case.
But first of all I want to identify the new highline's two neighbours...

Best regards,
Alex
________________________________________
Von: Chaitanya kumar CH [chaitanya.ch<http://chaitanya.ch>@gmail.com<http://gmail.com>]
Gesendet: Mittwoch, 7. Juli 2010 13:19
An: Alexander Plum
Cc: gdal-dev at lists.osgeo.org<mailto:gdal-dev at lists.osgeo.org>
Betreff: Re: [gdal-dev] Identification of neighbouring OGRGeometries

Alex,

If I understand you correctly, the method OGRGeometry::Touches() can help you.
You can see it's description and similar functions at http://gdal.org/ogr/classOGRGeometry.html


On Wed, Jul 7, 2010 at 2:17 PM, Alexander Plum <Alexander.Plum at cae.de<mailto:Alexander.Plum at cae.de><mailto:Alexander.Plum at cae.de<mailto:Alexander.Plum at cae.de>>> wrote:
Hello there,

is it possible to identify the two neighbouring OGRGeometries of another OGRGeometry??
Therefore I miss an adequate function in the GDAL-API.

Greets,
Alex

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--
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E



--
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E