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Re: [Geoserver-users] [udig-devel] R: R: SLD editor
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There is an interesting tension between desktop SLD goals and server SLD
goals. On the desktop the thematic mapping is important, to quickly
adjust properties to visualize patterns and the like. Which is why
uDig's hit that first. On the server side, however, what we really want
is the ability to set different zoom levels. One doesn't care so much
about zoom levels for desktop mapping, since it's really easy to adjust
the style to see details for the area you're on. Or you're setting up a
map for printing, which is just one zoom level.
The design I'm thinking for GeoServer is to have it oriented around the
set zoom levels of the Tile Map Server. When you define a rule of a
style you can easily set which zoom levels (1 to 17 or so) you want it
to appear at. Within that you'd rules and filters. It'd be great if
uDig did this, but it's more of a web mapping thing so I don't have high
hopes for the immediate future. But a tree editor would be a nice start.
Chris
Jesse Eichar wrote:
uDig will have a better SLD editor before too long but the most
common cases are most important to address when starting out. A good
SLD editor would be great. A good UI is one of the things holding us
back. The current paradigm is to make a tree editor. Where each
node in the tree is an SLD component. Ideas are welcome as this is
an important issue and a difficult one to solve. Screen mock-ups
would really help.
Jesse
On 21-Feb-07, at 7:09 AM, Fabio Da Soghe wrote:
I completely agree: there is a big middle ground between the
simplest SLD and the monstrous one currently uncovered by a tool
(neither open source nor proprietary, as far as I know). In a
typical GIS scenario we see the GIS operator (as such, not a
programmer able to hand-code the SLD) creating important thematic
symbolizations for data he/she has built. Every commercial GIS
software today can do that (ArcGis, MicroStation, AutoCAD,
Geomedia, etc.) but there's no way to export that simbolization in
SLD.
We found this: http://arcmap2sld.geoinform.fh-mainz.de/
ArcMap2SLDConverter_Eng.htm
The interesting idea is that you can use all the power and user-
friendlyness of such a rich tool like ArcGis and having its
thematism converted in an SLD file; of course that conversion tool
is far from complete :-(
If I can say, I think it was a pity to have several very basic SLD
editors open source (MapBuilder, maybe Geoserver is creating one
too), even web based (isn't it a nonsense to create such a complex
GUI tool in a web interface?), and not developing a single robust
and complete tool, like uDig could became (there are not many fast
improvements in this direction, it seems to me).
Only my 1 cent.
Cheers,
Fabio
-----Messaggio originale-----
Da: Andrea Aime [mailto:aaime@xxxxxxxxxxxxx]
Inviato: mercoledì 21 febbraio 2007 15.41
A: Fabio Da Soghe
Cc: 'geoserver-users@xxxxxxxxxxxxxxxxxxxxx'; User-friendly
Desktop Internet GIS
Oggetto: Re: [Geoserver-users] R: SLD editor
Fabio Da Soghe ha scritto:
Indeed this seems very odd to me: I was sure there would have been
plenty of open source utility to edit visually an SLD style, but
there's none today.
In my company we are in great difficult for this reason:
programmers
are the only capable of editing an SLD document with good
proficiency
but they are busy developing the application that will use
it, and the
GIS people has not all the XML and WMS knowledge needed to
create more
then the simplest style.
Maybe SLD is not so much used today?
The only systems I know using SLD are those Geotools based,
and DeeGree.
uDig uses SLD under covers, whilst unfortunately Geoserver
does not have an SLD editor. To be fair, uDig covers the most
common cases, and makes you revert to SLD hand coding for the
most complex issues.
The WMS spec did not force people to use SLD, and given the
complexity of the specification, most just flew away.
I agree an SLD editor is very much needed, yet:
* basic cases are handled by uDig. The only pity is that it's hard to
build a complex layered style with different "simple" styles for
different scale levels, and hard to apply filters (the CQL module
would allow for quick and intutive filter spec input).
* more complex ones tend to turn into scripts anyways. On the
Sigma demo we do have an SLD that is around 2000 lines,
any graphical
editor allowing to play with such a best would not probably be
much
simpler than coding XML directly...
I guess the middle ground is the interesting territory that's
not covered, that is, scales and filters with relatively
static symbolizers.
uDig could evolve to cover it.
Cheers
Andrea
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Chris Holmes
The Open Planning Project
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