[geos-devel] GEOS and Mapserver

[Paul Spencer]

Liz,

there is a php_ogr library that we built, it is just a set of php
wrappers for ogr functionality.  Frank added GEOS support to OGR
recently.  It should be possible to extend the php_ogr wrappers to wrap
the ogr functions that talk to GEOS.  You could then use OGR to open any
suitable format, perform GEOS operations like buffer, union, etc and
then write the results out to a supported format.

It would also be an interesting exercise to add GEOS support into
php_mapscript if OGR is built with GEOS support.  It should be possible
to use mapscript shapeObjs with OGR/GEOS and perform suitable operations
that way.

The php_ogr stuff is available on www.maptools.org/dl/php_ogr.

Cheers,

Paul

Godwin, Elizabeth wrote:
> I've cross-posted this to various lists, so I'm sorry to those who are
> getting duplicates.
>
> I'd like to beef up my Mapserver applications with some geoprocessing
> functionality - buffers at present, other functions will follow.  For
> now I am playing with PostGIS and having great sucess, IF my features
> are all stored in the database.
>
> What I'd like to be able to do though, is take a feature from WMS
> getFeatureInfo or WFS and be able to buffer that.  As a test of this, I
> took the GML from a getFeatureInfo request and parsed it manually to be
> a WKT string.  Then used PostGIS to run the buffer.  Apart from slight
> precision differences, it appeared to be close to what PostGIS would
> have done with it's own feature (the WMS request was done against the
> same feature through MapServer).
>
> Now that I confirmed this is all possible, what I am missing is that I'd
> like to be able to
> a.. do the conversion from GML to WKT with some script/library
> b.. do this with a GML stream
> c.. ultimately do this without PostGIS database dependancy.
>
> I figure that GEOS can do the geometry format conversions, is this right?
> Has anyone written a library for linux/windows that will let me talk to
> it with PHP?
>
> I'm prodding these lists in hopes of finding out what else is going on
> out there in this area. It would be fabulous if this was all built into
> Mapserver, but from what I can tell, it's just a thought right now.
>
> Thanks!!
>
> Liz Godwin
>
>
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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