Hi Martin,
I think we need both :
* QgsExpression for simple Process on Geometry and simple parameters
* SEXTANTE for complexe Process on Raster, Vector Layer, multiple Layer, etc
After some tests on WFS-Transaction, I need a way to validate my
geometry before updating or adding feature. In this case SEXTANTE will
be too big, QgsExpression is exactly what I need no more no less. I do
not need to Process layer.
For SEXTANTE, Vincent Picavet give the good solution :
/* Making sextante totally independant of qgis GUI, to be able to run
sextante processes in batch in command line mode//
//This will open the door to use Sextante as a real WPS processes
generator, //
//with features not unlike an ETL (or ELT)./
René-Luc D'Hont
3Liz
Le 03/12/2012 17:43, Martin Dobias a écrit :
On Mon, Dec 3, 2012 at 2:31 PM, rldhont <[email protected]
<mailto:[email protected]>> wrote:
My idea was to have a simple WPS server based on QGIS-Server, very
simple for simple vector case, and I thought it's a good idea. I
only need to validate geometry, constructing simple buffer or
intersection.
For big processing, I think SEXTANTE is better suitable, but for a
WPS serveur, SEXTANTE didn't need QGIS. We can construct a WPS
Server based on pySextante with pyWPS.
I don't really want to hack QgsExpression, just accesses to very
simple processing, I'll just it. For SEXTANTE, It will be better
to work on someting based on pyWPS.
I don't think PyWPS would be a good choice for WPS server
implementation. From a broader view, PyWPS does the same thing as
SEXTANTE does: it allows users to run processes and it allows
developers to provide custom processes. The main difference is that
PyWPS processing is meant to be triggered by WPS requests, while
SEXTANTE processing may be triggered by anything (currently mainly
GUI). On the backend side, PyWPS supports GRASS, while SEXTANTE offers
much more by default. It's true that one could attach SEXTANTE to
PyWPS and let QGIS server call PyWPS all the time, but that would
bring just additional limitations.
In fact, the server-side WPS support could be implemented directly
within SEXTANTE, the only thing that would QGIS server do would be to
pass WPS request to SEXTANTE routine and send its response back to server.
So the bottom line from my point of view:
SEXTANTE +1
QgsExpression -1
PyWPS -1
Regards
Martin
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