Part III. Using Compression to Cram More Data into a Local App–Large Images, Geo Data, and Lots of It

Who says that a small computer has to run small apps?

Certainly no one at Intermap, makers of AccuTerra. This GPS-mapping app offers thousands of square miles of hyper-detailed maps for iPhone users to examine, breadcrumb, mark, and explore. Luckily for AccuTerra's developers, Intermap already had all that map data ready--but it was no small challenge to slice it all into palatable, usable parcels and then find a way to monetize the various parts.

Jonathan and Ashley Wegener, who built Exit Strategy NYC, faced the opposite situation: a dead-simple idea for a useful app that required three months of subway-riding just to collect the data that would ...

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