[Qgis-developer] QGIS -> Mapserver export
vincent.ml at oslandia.com
Thu Apr 11 07:28:02 PDT 2013
Following the discussion in the other thread («QGIS Globe and mapserver
We at Oslandia started a very early proof of concept and work on
Warning : all this work is very alpha work, buggy, messy and not complete.
The first part is a plugin «à-la tilemill» to edit and watch live modifications
of a mapfile, based on the sourcepole mapfile tools plugins, but greatly
enhanced (with integrated editor).
It's there :
We work as well on QGIS->Mapfile export, as Hugo stated, based on Giuseppe's
work, but without going through SLD :
We chose the direct QGIS->Mapfile way because :
* SLD only covers a very small subset of QGIS/Mapserver symbology features
* SLD failed at being a reference format for styling (see the amount of
various languages for that)
* Mapserver support for SLD is not really good
It would be great to have a common style interchange format, but I do not see
that coming in the following years, and if it happens, it would probably be
more a css-oriented format than SLD type.
The current "nosld" branch as Hugo said, focus on new symbology. Some
incompatibilities exist between the two symbology systems, and they should be
well documented (not that well covered as for now, see TODO).
There is a need for work on the mapserver side too, to facilitate writing this
kind of converter, without having to leverage the whole mapserver stack. This
would be a "libmapfile" library, independant from the renderer. Thomas has some
ideas on that topic.
As for now, feel free to hack on our work and improve it. Maybe we should have
a global "export" plugin with various export types, among them SLD, native
mapserver, and the architecture to add more (Mapnik xml, carto, cartocss,
cascadenik, google maps symbology...)
We do not really have time to work further on it by now, but we'll be happy to
help and we intend to have some work done later in the year.
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