[postgis-users] ST_Intersection does not preserve M value

[Martin Davis]

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
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>
>
>
> --
> Darafei Praliaskouski
> Support me: http://patreon.com/komzpa
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