Steve Lime wrote:
The only GEOS methods exposed are convex hull and a buffer. I didn't
want to go nuts until I received some feedback about the usefulness of
that type of functionality. They are not difficult to add. Are there specific
operators you are interested in and would be willing to test? Let me know
if so and we can work in the 4.9 branch.
A full list of operators supported by GEOS is available at geos.refractions.net.
As for mapfile integration. My idea was to expose a few operators that
work of a single shape (e.g. buffer, convex hull, etc...) via the PROCESSING
block that is currently used for defining raster operations. That way you
could basically apply a GEOS operator to all features of a particular layer as
they are read from the data source- for any data source.
Steve
listuser HH <[EMAIL PROTECTED]> 01/19/06 5:49 AM >>>
Hello all,
I would like to know how much of the GEOS functions (and which) are
already available in the MapScript API and in PHP MapScript. I found
only intersects and cointains for both. The shapeObj in PHP Mapscript
also has buffer and convexhull.
Can someone tell me what the plans for including more of the GEOS
functions are?
Are there plans to use some functions (i.e. buffer) directly in the mapfile?
Are there any docs that give some more information?
Regards
Norbert
Hi Steve,
sorry for the late reply I was not in office.
At the moment I'm collecting arguments to convince costumers to use
MapServer. I know there are many good reasons to use MapServer - mostly
because of the good work you and the other developers did and do - but I
want to give a full overview. I tested PostGIS a bit and I think that
there is much potential but some of our costumers have Oracle and they
will not use Postgres. So it will be nice to have some of the functions
available in MapServer.
In the following I have made a list with the things I was thinking of. I
give a ranking for the importance (1 - most / 5 - fewest).
- crosses -> 1
- (boolean) intersect -> 2
- (geom) intersect -> 2
- union -> 2
- difference -> 3
- getCentroid -> 3
- getLength -> 4
- getArea -> 4
- touches -> 4
- isValid -> 5
- disjoint -> 5
If others are interested perhaps we can open a poll for "Geometry
functions in MapServer" with all the GEOS functions to see what would be
important for a bigger group of people.
Thanks and my best regards
Norbert
