[postgis-users] ST_Force3D and null/unknown altitude

[Denis Rouzaud]

Hi all,

If I understand correctly, Postgis does not handle NULL altitude in 3D 
geomtries.

Hence, when using ST_Force3D, it sets the altitude to 0, which I find a 
bit inconvenient (and dangerous).

1. Is there any ongoing or potential development towards handling null 
altitude in geometries or this is not feasible?

2. Do you have any good workaround? Like using -9999 and creating your 
own ST_Force3D?

Thanks a lot,

Denis
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