[geos-devel] M-coordinate support

[luca paganotti]

Hi Mike,

I agree with you about the M-coordinate support in geos, there are some
cases in which this support is a must.

For example I'm using geos to represent 3D points changing their position
in time so to have M seems really necessary, but I can be wrong, this
support is already built in.

To be able to use geos with ZM points I've lightly modified and rebuilt
geos tailoring it only to my needs. I've not done any kind of analisys or
deep thinking about it so it's only a very raw support for M, but that was
I needed.

P.S. I made also a little post to this list some time ago saying that, but
I received no answer, maybe it was not so interesnting or I was missing
something that could give me M-support without rebuilding the modified
library.

Best regards

lp



On Tue, Jul 10, 2012 at 1:41 PM, Mike Toews <mwtoews at gmail.com> wrote:

> Hi devs,
>
> I'd like to know if "measure" or M-coordinate support is somewhere on
> the development horizon for GEOS. I could see the benefit of opening
> client software to support ISO 19125 compliant geometries, such as in
> OGR or Shapely.
>
> Possibly the first widespread use of M-coordinates started in the
> 1990s with the Shapefile file format, as detailed in the 1998 ESRI
> technical specs. With open source software, Shapelib and PostGIS has
> supported M-coordinates for quite some time (possibly close to a
> decade?). More recently, Simple Features Access Standards published by
> OGC and later ISO 19125, detail the use and storage of of
> M-coordinates in various geometry types.
>
> Are there any limitations to adopting M-coordinate support for GEOS?
> Potential performance loss? Other limitations or incompatibilities?
> I'm curious, as I often run into instances where this dimension is
> useful, but am a bit stumped at it's lack of support in some software.
> Thanks.
>
> -Mike
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