Convert hgt maps to png

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Resource:
http://dds.cr.usgs.gov/srtm/version2_1/

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Experiments / helpful instructions:
http://forum.unity3d.com/threads/40870-Real-satelite-image-to-High-defenition-terrain-in-Unity3d

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Really good software:
http://www.jizoh.jp/english.html

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More info (FAQs):
http://www2.jpl.nasa.gov/srtm/faq.html