HabitableZone

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Podrock, help

I used to be able to download grey scale elevation maps from the usgs at http://viewer.nationalmap.gov/basic/

Now they are in some *.img format I cannot view- I need .tiff, or .png- is there a converter (preferably free) that you recommend?

In the end I need images like this:

http://i15.photobucket.com/albums/a389/jh88fan/height.jpg

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