[geos-devel] Dimension and Coordinate Sequences

[Paul Ramsey]

This would be an excellent time! :) It is raised about every 2 months
on the list, both the oddness of the return value and the fact that we
have no M value support.

P

On Mon, May 17, 2010 at 8:42 AM, Frank Warmerdam <warmerdam at pobox.com> wrote:
> strk wrote:
>>
>> On Mon, May 17, 2010 at 11:25:56AM -0400, Frank Warmerdam wrote:
>>>
>>> Folks,
>>>
>>> I am creating a GEOS Point from 2D WKB input, then fetching back the
>>> CoordinateSequence and interogating it's dimension.  I get "3".
>>>
>>> Looking through the code there does not seem to be a real effort to
>>> preserve
>>> dimension for coordinate sequences, at least with the
>>> CoordinateArraySequence
>>> implementation.  Is this intentional?
>>
>> The interface was added to later make a real effort,
>> but none is made at this time indeed.
>
> Strk,
>
> Is this a good time for me to take a crack at implementing dimension
> support?   I see the dimension potentially makes it as far as the
> CoordinateArraySequenceFactory, but that CoordinateArraySequence has
> nothing to keep track of it.  I could add it as a private member and
> ensure it is passed in by the factory.
>
>> When non-empty you could check for IsNan(Z) but when empty you can't
>> tell..
>
> I'm using the C API.  Is there a nice portable way to check for NaN in C
> code?
>
> 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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