[postgis-users] ST_Intersection does not preserve M value

[Darafei "Komяpa" Praliaskouski]

It's in backlog for 6 years already I believe:
https://trac.osgeo.org/geos/ticket/466

пн, 6 мая 2019, 19:33 карыстальнік Martin Davis <mtnclimb at gmail.com>
напісаў:

> It should be possible to post-process GEOS results to re-populate the M
> values if present.  Linear interpolation could be used to estimate values
> at intra-segment points.  We can put this on the list for future
> development.
>
> On Mon, May 6, 2019 at 4:48 AM Darafei "Komяpa" Praliaskouski <
> me at komzpa.net> wrote:
>
>> Hi,
>>
>> GEOS operations do not preserve M, but sometimes preserve Z. You can try
>> ST_SwapOrdinates(ST_Intersection(ST_SwapOrdinates(geom, 'zm'),...), 'zm').
>>
>> On Thu, May 2, 2019 at 5:19 AM Bo Guo <bo.guo at gisticinc.com> wrote:
>>
>>> Hi there,
>>>
>>> I was trying to cut a portion of the LRS route with an area using
>>> ST_Intersection.  However the resulting route no longer carries measure
>>> value.  The behavior is the same for version 9.6 or the latest version
>>> 11.  Anyone has any suggestions?
>>>
>>> Thanks!
>>>
>>> Bo
>>> _______________________________________________
>>> postgis-users mailing list
>>> postgis-users at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/postgis-users
>>
>>
>>
>> --
>> Darafei Praliaskouski
>> Support me: http://patreon.com/komzpa
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>
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