Hi Mark,
Here are a couple more novel and inspiring uses of GPS...
1) One can determine snow depth by monitoring the SNR of each SV:
GPS Snow Depth
http://xenon.colorado.edu/spotlight/index.php?action=kb&page=10
GPS Snow Sensing
http://xenon.colorado.edu/presentations/Chapman/SnowChapman.pdf
2) One can determine ocean or tide levels by using both a RHCP antenna looking
up and a LHCP antenna looking down:
GPS & Sea Level Case Study
http://xenon.colorado.edu/spotlight/index.php?action=kb&page=67
How does a GPS Tide Gauge work?
http://xenon.colorado.edu/reflections/GPS_reflections/TideGauge.html
The Accidental Tide Gauge: A GPS Reflection Case Study From Kachemak Bay,
Alaska
http://www.kristinelarson.net/wp-content/uploads/2015/10/LarsonIEEE_2013.pdf
3) One can use high-rate GPS as a seismometer:
GPS & Earthquakes
http://xenon.colorado.edu/spotlight/index.php?action=kb&page=46
Observing Seismic Waves Using High-Rate GPS: The 2002 Denali Fault
Earthquake
https://www.unavco.org/community/publications_and_reports/proposals/2007/facility2007/section3/UNV-GRID-SPREAD-EC.pdf
/tvb
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