So, if I understand you correctly, your original map data is stored in
SVG files.
In that case you can use Apache Batik to render into georeferenced PNG
files (if your SVG data is georeferenced). You can trigger this
rasterization process whenever there was a change in the SVG data. This
georeferenced raster data can be fed into UMN Mapserver for fast
delivery. My guess is, while the quality of the Apache Batik rendering
process is excellent, it won't be as fast as the UMN Mapserver, when
delivering maps.
Alternatively, you can consider to serve the SVG data directly, without
going through PNG files. You can also combine SVG with Postgis where the
vector data is stored in Postgis and the SVG is generated on the fly.
You can see an example of this approach at
http://www.carto.net/williams/yosemite/ - for bigger SVG files it is
certainly faster if you store your geodata in a spatial database and
deliver customized extents, simplified versions and sub-selects
appropriate to the chosen mapscale.
Hope this helps,
Andreas
Jeremy Short wrote:
My goal is to render an SVG image map to PNG to display on our website
within a mapviewer of some sort with panning and zooming capability.
We have many maps. I want to use an Open Source solution. Our web
server is running Apache.
Additionally we want to add a "layer" of text labels which will not
get bigger when we zoom in. Too, since we have large pictures so they
don't degrade when one zooms in, we would like to explore the ability
to send only "tiles" of the map picture if it's required.
What I have found thus far:
1. Using OpenLayers as a client gives us the ability to load a PNG
file, pan, and zoom.
2. For the ability to add layers of text labels and transport tiles of
data I explored the possiblity to use Mapserver. It appears Mapserver
requires a map file like an SHP file as input and it will output a
PNG. I would like to feed it as input a PNG file but I don't know if
Mapserver is designed for this.
Looking further into this I see one can possibly use a tool like gvSIG
or AB Viewer to translate a PNG to a SHP file but I want to automate
the process without this extra step because people will be modifying
the SVG file periodically.
There seems like there must be a better way to accomplish what I want
which is to render PNG images in a client web browser with the ability
to navigate within the map and to render text labels and transport
tiles of information. Is there?
--
--
----------------------------------------------
Andreas Neumann
Institute of Cartography
ETH Zurich
Wolfgang-Paulistrasse 15
CH-8093 Zurich, Switzerland
Phone: ++41-44-633 3031, Fax: ++41-44-633 1153
e-mail: [EMAIL PROTECTED]
www: http://www.carto.net/neumann/
SVG.Open: http://www.svgopen.org/
Carto.net: http://www.carto.net/
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