Hi Andreas,
what you describe is where I use tiles. My city map is a QGIS project
with around 25 layers, lots of labels (street names) and elements. I use
mapcache (standalone) for that and of course it would be nice to have
that integrated in QGIS server but it was not hard to configure it by
itself. Creating the tiles is slower than direct rendering from QGIS
server but accessing is a lot faster than QGIS server (and less CPU).
eSo caching is an option if data changes do not need to be visible
immediately. If mapcache could be integrated in QGIs Server we could
benefit from faster service and have legend and feature info, too.
So +1 for that.
What I really miss in QGIS server compared to UNM mapserver is the
possibility to keep a certain space around the edge of the generated
output free of labels (UMN Mapserver has had that already in V 5.? or
even earlier). This is a must-have if we want to integrate mapcache
because otherwise there will be broken labels and tiles will not fit to
each other labelwise.
just my 2 ct
Bernhard
Am 15.11.2012 08:57, schrieb Andreas Neumann:
Hi,
For 90% of my projects performance is really good. For the remaining
10%, rather complext projects, I would say it is good enough, but it
could be "snappier".
I am specifically talking about the "Leitungskataster" project, the
project displaying all supply lines and waste-water lines, containing
cadastral data, electricity, gaz, water, communication, waste-water and
heating.
These complex projects typically have:
* a lot of layers (around 70 layers)
* a lot of rules in the layer symbology
* automatically placed labels along lines
* dash patterns - almost all the lines are dashed
* SVG symbols
I will have to do my own homework. I will probably have to reduce the
number of layers by using views.
And to be honest, I haven't set up the same project on UMN mapserver to
compare whether it is really faster.
I don't know yet where the bottlenecks are (too many layers, too many
rules, too many rules, too many labels?).
Thanks,
Andreas
Am 14.11.2012 21:13, schrieb Marco Hugentobler:
Hi all
Performance is a complex topic, it essentially depends what you are
testing ( few complex polygons, many small polygons, type of raster,
lots of labels, ...).
I'm regularly profiling some of my important server projects (e.g. WMS
of cadastral survey). One thing that takes up a lot of render time is
the drawing of the labels (only the rendering, not the placement).
I think this is because they are rendered using QPainterPath and not
with QPainter->drawText (but it might be difficult to render the buffer
using drawText).
And don't forget that normally the transfer of the image over the
internet takes more time than the WMS rendering itself. So don't forget
to use jpg for rasters and the improved png8 for vectors. It can improve
perceived performance by a factor of 3 or 4.
Regards,
Marco
On 14.11.2012 19:57, Andreas Neumann wrote:
Lets say that speed of QGIS Server is good enough for most of my
projects. But it could be faster for more complex rendering and labeling.
UMN feels faster than QGIS Server - but I don't have time for double
configurations for desktop and web. Plus - it is so much easier to
configure QGIS projects compared to editing mapfiles.
"G. Allegri"<[email protected]> schrieb:
The one thing were UMN Mapserver is a much better is
performance. This
is where we should really catch up.
I would put this to the higher position! I don't know where the
effort should be put, because I suppose it's something deep in the
rendering engine of QGis. Do you see bottlenecks at the server level?
I would also add a point to the whishlist: Qgis Server Python API ;)
giovanni
2012/11/14 kimaidou<[email protected]<mailto:[email protected]>>
Hi
2012/11/14 Vincent Picavet<[email protected]
<mailto:[email protected]>>
Hi,
> * templates for HTML popups (already done this in
Lizmap, but why not
> having it in Qgis)
You mean accessing the templates through QGIS server ?
Because html popups
already are in QGIS :)
I mean through Qgis Server (in respect to this thread title ;)
Just exposing methods for the server must do it, as Andreas
proposed.
We should have a look at PyWPS too, which could be an easy
way to provide WPS
services around QGIS API.
Yes, pyWPS could help provide this feature, but we still need
a way so that QGIS Server can use python plugins / processes,
etc.. I remember discussion about this during last hackfests,
but I do not know if someone gave it a try.
Anyway, +10000 for focusing on performance first, which is the
key "feature" for a Server.
Michael
Vincent
>
> Good evening
> Michael
>
>
> 2012/11/14 G. Allegri<[email protected]
<mailto:[email protected]>>
>
> > > - integrated tiling
> >>
> >> Why not integrating mapcache directly to mutualize
effort on this part ?
> >> Mapcache can be used standalone, and could read its
parameters directly
> >> from a
> >> qgis configuration file. No need to reinvent the
wheel here, or would
> >> there be a
> >> good reason to it ?
> >
> > I think that a tile generator from the QGis Desktop
side would suffice.
> > Any other TMS/WMS-T server could use the tile structure.
> >
> >> > - mask layers
> >>
> >> That would be great to have in QGIS indeed. It would
mean having for
> >> each layer an attached mask layer, which is not
displayed but only used
> >> to define
> >> hidden places.
> >>
> >> > - symbol placement
> >> > - label offsets
> >>
> >> That's for qgis symbology, not directly a qgis server
issue. Label
> >> offset in
> >> mapserver definitly looks cool !
> >
> > I agree Vincent.
> >
> >> Vincent
> >> _______________________________________________
> >> Qgis-developer mailing list
> >> [email protected]
<mailto:[email protected]>
> >> http://lists.osgeo.org/mailman/listinfo/qgis-developer
> >
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