Dane Springmeyer

> Now that I've scrolled through the file, I see that expressions do not work for any of the raster symbolizers. Correct. > Is there a major technical reason for...

> Having variable support here would be huge for my work with Mars elevation data, as I could actively tune the bounds of elevation colorization based on min-maxes per image...

> On a related note, one potential difficulty -- is there a way to set default variables at the datasource level? No, but maybe I'm not following. Can you say...

> can set default variables, but these are evaluated during the compilation of the stylesheet. Yes > Basically, when you author a stylesheet with expressions, you have to be sure...

@davenquinn - checking in here. Any chance to work on an implementation? Anything else left to do here before closing?

> I think this is a bug in setup.py in the first place, but some general advice in the readme about BOOST_PYTHON_LIB, BOOST_THREAD_LIB and BOOST_SYSTEM_LIB variables would be good to...

> I can't seem to grasp what npm install mapnik --build-from-source actually does. Does it use binaries or the mapnik build on host? - `npm install` pulls binaries, if they...

@flippmoke yes, this is worth it. Next action: @springmeyer sets up a nightly cron job to post results.

Yes it is supported. However it has not see much testing. Next step would be to start testing it in travis.

@davidtheclark Mapnik (core) reads the first 5 features, by default, to assemble the schema of possible attributes. The default of 5 is conservative for performance reasons on very large feature...