[postgis-devel] ST_Area, ST_Area2D

[Paul Ramsey]

length3d should return a different result for a 3d line than
lenght2d... and we do need both variants, since sometimes you want the
2d legth of a 3d line.

P.

On Fri, Jul 18, 2008 at 7:55 AM, Obe, Regina <robe.dnd at cityofboston.gov> wrote:
> Paul,
> Ditto for these too?  ESRI and IBM just refer to this as ST_Length
> --Docs have ST_Length2D and 3D but no ST_Length
>
> ST_length2d(geometry)
>
>    Returns the 2-dimensional length of the geometry if it is a
> linestring or multi-linestring.
>
> Just replace with ST_Length()?
> Both ST_Length() and ST_Length2d() map to -
> LWGEOM_length2d_linestring
>
> Now ST_Length3D() maps to LWGEOM_length_linestring
>
> Which on closer tests - gives me the same answer as ST_Length() for a
> 2-d string.
>
> Is there a reason why we can't just have a single documented
>
> ST_Length and state it works for both 2D and 3D strings?  and in future
> versions just have all 3 map to LWGEOM_length_linestring
>
> and deprecate the 2D and 3D names?
>
> Thanks,
> Regina
>
>
>
> -----Original Message-----
> From: postgis-devel-bounces at postgis.refractions.net
> [mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of Paul
> Ramsey
> Sent: Friday, July 18, 2008 10:35 AM
> To: PostGIS Development Discussion
> Subject: Re: [postgis-devel] ST_Area, ST_Area2D
>
> Undocument it, and note that it is deliberately undocumented in the
> .sql.in file, so we don't go and re-document it in the future.
>
> On Fri, Jul 18, 2008 at 5:36 AM, Obe, Regina <robe.dnd at cityofboston.gov>
> wrote:
>> Can I scrap ST_Area2D from docs and just replace with ST_Area? or is
>> ST_Area2D really the preferred name?  They both map to
>> LWGEOM_area_polygon, but
>> the docs list the ST_Area2D one which seems a bit more verbose and
>> unconventional.
>>
>> Both IBM and ESRI on quick search just call it ST_Area
>> IBM -
>>
> publib.boulder.ibm.com/infocenter/db2luw/v9/topic/com.ibm.db2.udb.spatia
>> l.doc/rsbp4034.html
>>
>> and Esri
> webhelp.esri.com/arcgisserver/9.3/java/geodatabases/st_area.htm
>>
>>
>>
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