[gdal-dev] OGRGeometry Distance

Yilmaz Arslanoglu yilmaz.arslanoglu at gmail.com
Tue Sep 22 18:50:50 EDT 2009

Thanks very much for the answer, Frank.

Best wishes,

On Mon, Sep 21, 2009 at 10:12 PM, Frank Warmerdam <warmerdam at pobox.com> wrote:
> Yilmaz Arslanoglu wrote:
>> Also, as another related question, I query the DEPCNT  layer in one of
>> my ENC files, and it has a geospatial reference.
>> However, the points on the line string features themselves return NULL
>> when they are queried with getSpatialReference().
>> Aren't they expected to return exactly the same instance for the layer
>> that they reside on?
> Yilmaz,
> Others have addressed the geodesic distance issue.
> On the spatial reference issue, you are correct.  The geometry from the
> layers ought to return a pointer to the same spatial reference object
> as you see on the layer.  It is a defect of the S-57 driver (and I suspect
> a number of others) that this is not done.  If you like, you could file
> a ticket on this and someone could fix it up.
> In practice the spatial references attached to the geometries are rarely
> consulted by applications and so are often not set properly by drivers.
> Best regards,
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent

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