[gdal-dev] [EXTERNAL] Re: [GSOC] Support for m coordinates in OGRGeometries

Wed Mar 18 04:15:57 PDT 2015

Oracle definitely supports M.

Mike
----
Michael Smith

US Army Corps
Remote Sensing GIS/Center
michael.smith at usace.army.mil

On 3/17/15, 11:20 PM, "Even Rouault" <even.rouault at spatialys.com> wrote:

>Selon Daniel Morissette <dmorissette at mapgears.com>:
>
>> FWIW I think support for M would be a very welcome addition. An
>> immediate use I'd see for it would be support for time on GPS tracks in
>> GPX files.
>>
>> Note that if supporting the M dimension doesn't seem enough for a SoC
>> project, making sure that all formats that support M (or as many as
>> possible) are upgraded to properly implement it may very well fill the
>> rest of the summer.
>
>Good point. At least the following ones for sure support M: Shapefile,
>ESRI
>Personal Geodatabase, FileGDB / OpenFileGDB, PostGIS (and PGDump and
>CartoDB),
>Spatialite, GeoPackage
>Likely (but not verified): GML, Oracle
>Maybe: MSSQL, MySQL
>And as pointed by Daniel, the GPX and KML / LIBKML drivers could also use
>the M
>dimension for storing track times. Probably the GPSTrackMaker one also,
>but not
>verified.
>So indeed quite a few drivers to get familiar with!
>
>>
>> My 0.02$
>>
>> Daniel
>>
>>
>> On 2015-03-17 9:04 PM, Even Rouault wrote:
>> > Selon Edson Ticona <xcr33d at gmail.com>:
>> >
>> >> Hi
>> >>
>> >> I was looking for the ideas list on the site and found this one
>> >> interesting: "Adding support for "M" dimension in OGR Geometries" but
>> >> it's from 2014. Is it still relevant for the project? I searched on
>> >> the code and it isn't implemented.
>> >> For example, the class OGRGeometry needs the methods isMeasured,
>> >> LocateAlong and LocateBetween according to the definition on the OGC
>> >> simple standard. I couldn't find an ISO standard talking about M
>> >> coordinates. Which one do you refer on the page?
>> >> What do you think? Some feedback would be helpful.
>> >
>> > Edson,
>> >
>> > Yes it is still relevant. Perhaps SQL/MM Part 3 mentions it ? I didn't
>> check.
>> > You'll find the link to a draft doc on
>> > http://trac.osgeo.org/gdal/wiki/rfc49_curve_geometries
>> > What has been done in PostGIS might also be interested looking into.
>> > M only might be a bit light for a whole SOC, so adding support for
>> > POLYHEDRALSURFACE and TIN might also been interesting for completness
>>(and
>> full
>> > PostGIS interoperability).
>> >
>> > Even
>> >
>>
>>
>> --
>> Daniel Morissette
>> T: +1 418-696-5056 #201
>> http://www.mapgears.com/
>> Provider of Professional MapServer Support since 2000
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>>
>
>
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