A group of tech enthusiasts and bloggers in Tbilisi Georgia joined me and Sopho from OpenMapsCaucasus to prototype some solar hot air balloons for use in balloon mapping. Helium in Georgia is exorbitantly expensive – $700 for a 250-cubic foot tank, which would cost $125 in the US or $250 in the West Bank (and would last for up to 8 flights). To try to get around the helium cost issue, we’re trying a variety of other means to get cameras up in the air.

This flight wasn’t successful – we reached only about 10 meters – but perhaps with darker plastic, or in lower winds, this could be a viable replacement for helium.

The map, 5.5 kilometers from end to end, is the largest area ever mapped using these techniques, and was completed in less than 3 days, with a 6-foot helium balloon flying up to 1.4 kilometers above the ground. Below, you can see the flight paths of our first 3 launches, recorded with a lightweight GPS which we attached to the balloon:

The trip is the first of a series of mapping expeditions and workshops I’ll be teaching with OMC staff across the country, and the imagery will be used to improve the public domain map that OMC is developing.