[postgis-devel] ST_GeometrySplit

[Chris Hodgson]

Hmm... nevermind, I guess it's not.

select st_astext(st_difference( st_geomfromtext('LINESTRING(0 0, 0 2)'), 
st_geomfromtext('POINT(0 1)')));
      st_astext     
---------------------
 LINESTRING(0 0,0 2)

Chris

Chris Hodgson wrote:
> Isn't this the same as st_difference(A,B), when given any of those 
> pairs of arguments? Wrap it in an st_dump() if you want to separate 
> the individual results?
>
> Chris
>
> strk wrote:
>> Brain picking you guys about a ST_GeometrySplit.
>>
>> The cases of interest seem to be:
>>  - Split polygon by line
>>  - Split line by line
>>  - Split line by point
>>
>> Initial questions:
>>  - Should we allow multi-segment "blade" lines ?
>>    (where a single polygon or line might be cut in multiple pieces)
>>  - Should we allow multi-component inputs ?
>>    (where the "blade" might cut a single component)
>>
>> Both questions are related to the kind of returned output,
>> that is: should output be always composed by 2 parts or
>> possibly multiple parts ?
>>
>> Comments welcome.
>>
>> --strk;
>>
>>   ()   Free GIS & Flash consultant/developer
>>   /\   http://strk.keybit.net/services.html
>> _______________________________________________
>> postgis-devel mailing list
>> postgis-devel at postgis.refractions.net
>> http://postgis.refractions.net/mailman/listinfo/postgis-devel
>>   
>
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-devel