[postgis-devel] Re: LRS functions

[strk at refractions.net]

Chris,
I guess the only one of your function missing in current
LRS functions set is the LRS geometry constractor, can
you confirm this ?

The geometry extractor funx in CVS are more general then
the one you implemented, in that they don't assume M
values to be consecutive and ordered (vertex in a line
can cross the M range multiple times). The semantic of
the ones in CVS is derived from an ISO document.

--strk;

On Tue, Nov 29, 2005 at 01:48:57PM -0500, Christoph Spoerri wrote:
> I wanted to check with you on how my LRS functions could be added to the 
> current postgis code base. Do you have certain procedures , documents or QAQC 
> checks that need to be followed?
> 
> I would like to provide the LRS functions to all the users and not just to 
> users with an imminent need.
> 
> thanks,
> Christoph
> 
> 
> On Wednesday 23 November 2005 09:04, strk at refractions.net wrote:
> > We've added two LRS functions with semantics
> > specified by ISO SQL/MM:
> >
> > 	- locate_along_measure(geom, measure)
> > 	- locate_between_measures(geom, m_start, m_end)
> >
> > Differently from Chris version the M values
> > are not assumed to be consecutive, so an input
> > LINESTRING can result in a collection of
> > LINESTRINGS and POINTS in output.
> >
> > Polygons, multipolygons and collection types are
> > NOT supported, all others are.
> >
> > In the process of finalizing semantics all comments
> > and tests are welcome (in HEAD branch).
> >
> > --strk;
> >
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