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Comment by kgc | Hacker News Reader

This is possibly the most interesting thing I've read on HN. I knew that a similar principle is used for CT scans, but I never thought of blowing it up to Earth-scale. Thank you.

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Thanks. This work is interesting http://tel.archives-ouvertes.fr/tel-00444081 Unfortunately the main thesis is in french, however there are included articles in english and lots of references. I am currently working on a project using a high density GPS stations network we deployed in the south east of France. We have had good results for nowcasting and to map in 3d the atmospheric weather content. No publication yet though.

2d maps of rainfall have also been derived from interpolated GSM antennas, using the signal loss.

I've done a ton of research into precision positioning with GPS (centimeter resolution). Have you investigated using NOAA CORS data in your project? http://geodesy.noaa.gov/CORS/

Disclaimer: GPS is one of those parts of science that gives me the nerd chills.

Cors data is limited to the USA, we used RGP data, a network of ground stations maintained by the IGN which is analogous to Cors. The IGS gathers data throughout the world to enable global applications but it looks like the data is more complete when accessed through national networks.

I worked a few years ago on precision guidance. I was supposed to assess the performance of automatically guided tractors. Sub centimetric guidance on 4 tons huge tractors was pretty tricky to test. On what exactly did you work?

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