Web map has become an important utility of our daily life. We use it to plan a trip for directions, we use it to virtually walk around a city in 3D, we use it to find an apartment or a house from map mashup applications and so on. What if we want to ask more complicate questions to the web map, questions such as "
How many Starbucks stores within 5 miles range of a dream house I can't take my eyes off, and I can drive to some of those stores in 3 minutes from the dream house?" Obviously for questions like this, merely putting markers/push-pins on the map is not enough.
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