Where are LA's most effective schools?

After seeing the LA Times analysis of how effective local teachers are at improving their students performance, I was left wondering how the different neighborhoods performed. School rankings based on pure academic achievement aren't that informative since they correlate very closely with the wealth or poverty of their students family, but the 'value-added' approach seemed like it might produce more informative patterns. Here's the map I built, using the Times' ranking of schools from one to five, where dark blue marks the most effective elementary schools:

http://www.openheatmap.com/view.html?map=EricolinCounterweightsPuffinus

As always, here's the code I used to gather and format the data to load into OpenHeatMap:

http://github.com/petewarden/schoolcrawl

There's an obvious cluster of under-achieving schools between Culver City and downtown LA, but I was pleased to see some pretty poor areas like Compton showing some effective schools. Northridge seems to have a lot of great schools too, along with Culver City and Santa Monica, though there are a few surprises with 'one' rated schools tucked in amongst the rest.