[MapProxy] database-update triggered reseeding

[Steven M. Ottens]

Hi all,

I'm designing an application where highschool students will go into the 
field collect data on the type of lights used in houses. (Quite a cool 
project using a home made spectrometer to distinguish between 
incandescent, LED and CFL). The idea is that in the last week of October 
20000 students will collect this data aggregated on streetlevel and the 
results will be rendered on a map.

Everytime a student enters data (s)he obviously wants to see his/her 
result ASAP on the map. This means that for a week there will be lots of 
updates on the map and at the same time lots of requests. So I was 
thinking it would be nice to have an OSM-style setup: every update on 
the database triggers a 'dirty' flag on the affected tiles and they are 
rendered ASAP.

The usecase is a bit easier than OSM: we will divide the country in a 
series of small polygons at which level the data will aggregated as such 
only the attribute of the polygon will change, never the geometry and we 
could calculate before hand which tiles are be affected by a change in 
the database.

Has someone tried to build such a thing with MapProxy before? Any 
thoughts on implementation?

Cheers,
Steven