[postgis-devel] Adding 4D support to asGeoJson

[Paul Ramsey]

Having the data drive it would result in a change of behaviour relative to the current baseline (currently 4d geoms are truncated to 3d outputs). However, I tend to be more on your side, but only because the world already has too many configuration knobs.

P.

> On Feb 1, 2018, at 11:01 AM, Alexandre Lessard <alessard at mapgears.com> wrote:
> 
> I would personnaly prefer to let the data decide for the number of dimensions returned, but if everyone asks for a switch I'll add it, but I have a question about the best way pass that switch from the beginning function to pointArray_to_geojson? By adding a new param like "bool hasm" to all the function call and all the parents and also in all the size functions or is there a better way to pass that kind of information through?
> 
> And for the function call directly in postgresql, do we want a ST_asGeoJson(integer gj_version, geography geog, integer maxdecimaldigits=15, integer options=0, boolean withmeasure=false) or a new function called something like ST_asGeoJsonM().
> 
> Thanks.
> 
> Alex
> 
> 
> On 2018-01-31 16:41, Paul Ramsey wrote:
>> alright.
>> 
>>> On Jan 31, 2018, at 6:53 AM, Olivier Courtin <olivier.courtin at gmail.com> wrote:
>>> 
>>> On Wed, Jan 31, 2018 at 2:32 PM, Paul Ramsey <pramsey at cleverelephant.ca> wrote:
>>> 
>>> 
>>>>> Maybe add an optional function argument to request the kind of
>>>>> standard, as we have for WKT (ISO, OGC, Extended) ?
>>> +1
>>> 
>>>> What, and then strip out extra dimensions for ISO GeoJSON? That seems needlessly byzantine.
>>>> If people are getting 4d geojson from their 4d objects, they can just force3d them before calling asgeojson.
>>>> I don’t think the standards differ enough to be worth the extra cruft.
>>> In fact, we already deal with dimensions in this export function,
>>> 
>>> And for the ones who already use ST_AsGeoJSON with various dimensions
>>> objects, including 4D,
>>> it could lead to an unwanted behaviour change.
>>> 
>>> O.
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