After the actuall conference was over, I attended another workshop: about mapproxy. At my work, we have done nothing regarding map caching and proxying and tiling (we have done a lot on regular web caching, though). We’re “just” generating complete images on demand via WMS as lots of our data is pretty dynamic. But there is mostly-static data. And by setting up our software differently, tiling and proxying and caching becomes possible. At the moment I can only dream about what that’ll do to the speed of our web applications… :-) So that’s why I attended this workshop: getting to know at least one of the available map proxy tools.
Ok, what’s mapproxy?
Started in 2008.
Made with python, so platform-independent. (It is harder to install on windows than on osx/linux, though, probably because of some dependencies).
It is more or less a proxy, a cache, between a WMS server and clients. It speeds it up.
The advantage of mapproxy compared to most other proxies is that it supports all of WMS, so desktop clients also work fine with it.
A core piece of functionality of mapproxy is that it tiles the map. In order to cache a map, it subdivides it into parts.
What are the possible input data types?
Tiles (like google maps, openstreetmap).
And what can come out? (Note that this means that you can theoretically take google tiles and turn them into a WMS service!)
TMS (Tile Map Service, so google-tile-like, only sepecified properly)
Some comments from the hands-on-keyboard part of the workshop:
MapProxy is just an
pip install MapProxy away. Well packaged!
You can create an example configuration with paster. This made a good impression on me, as it means it is really a well-packaged python product.
Whoever designed those German keyboard layouts should be shot. Twice. Darn, I kept mis-typing all the time.
Hey, a nice
.ini python paste file to run the server with. Integration
with standard python wsgi tools and so easy integration into web
servers. Looks good.
Some instructions are at http://workshop.omniscale.net/workshop.html
In the end, I found it a very good workshop. Glad I attended. And the mapproxy software left a very good impression on me: I’m looking forward to using it.
My name is Reinout van Rees and I work a lot with Python (programming language) and Django (website framework). I live in The Netherlands and I'm happily married to Annie van Rees-Kooiman.
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