[postgis-users] st_linemerge not working with 4d coords

[Paolo Importuni]

Hi everybody,

I am trying to merge two linestring like in the following example:

select st_astext(st_linemerge(st_collect(ST_GeomFromEWKT('LINESTRING(5 5 5
5, 10 10 10 10)'),ST_GeomFromEWKT('LINESTRING(10 10 10 10 , 15 15 15
15)'))));


but the output is
"LINESTRING Z (5 5 5,10 10 10,15 15 15)"

that is,  the 4th dimension is lost.

Can anyone please explain  me the reason  and how to overcome this problem?

Thanks and best regards

Paolo
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