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Comparison of JavaScript mapping libraries?

I need to build a custom interactive web map of my country with all it's regions (Peru). Which tool or technology would be the best way to go?

The idea is to have a map that shows the population of each region with a color scale: the more people the region has, the darker it's painted. Also I need to display some information as text and pictures when I click each region as the maps zooms in.

I've seen around and there are lots of "pre-developed" tools that can be customized but I need to build my own. Flash is already discarded. I was thinking of Java applet but is just an idea. Thank you for your answers.

System requirements: Apache+PHP+MySQL

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marked as duplicate by underdark Dec 7 '11 at 21:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

What are your requirements and available software/databases? – blah238 Dec 7 '11 at 20:27
Are you asking anything that differs from this thread? – whuber Dec 7 '11 at 20:27
@blah238 Apache+PHP+MySQL – Jorge Dec 7 '11 at 20:36

Open Layers is very popular and flexible. You may want to start there. Many of the other packages available build on OpenLayers.

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