[gdal-dev] Support for measures

[Ari Jolma]

27.01.2016, 14:34, Ari Jolma kirjoitti:
> 27.01.2016, 13:27, Even Rouault kirjoitti:
>> Le mercredi 27 janvier 2016 11:55:01, Ari Jolma a écrit :
>>> Folks,
>>>
>>> I'd like to try to implement the XYZM support since I have some free 
>>> time.
>>>
>>> Before making a RFC, there are some thoughts/questions/ideas:
>>>
>>> * I made a fork for this work at https://github.com/ajolma/GDAL-XYZM so
>>> I can more easily use travis.
>>>
>>> * I think this is mainly changes in the geometry API and generic 
>>> methods.
>>>
>>> Are there other drivers than shape, which are affected?
>> On top of my head: PostGIS, FileGDB, OpenFileGDB, GeoPackage, 
>> Spatialite.
>> Probably other RDMBs too (Oracle, MSSQL, ... ?)
>
> I'm not so sure that it is so many. For example PostGIS driver is 
> mostly moving WKB back and forth.


Well, it seems that they are affected. There is for example the 
setCoordinateDimension() method, which is called by many drivers and 
once measures are supported it becomes ambiguous since coordinate 
dimension is 3 for both XYM and XYZ.

Ari


>
> Anyway, I'll look into the geometry API first.
>
> Ari
>