They are getting really good at this.
http://phys.org/news/2014-11-nasa-team-advances-next-generation-3d-imaging.html
And one of many examples......
http://phys.org/news/2014-12-archaeologists-reveal-layout-medieval-city.html
I installed a receiving station in 93. We had real time monitoring of moisture content and temp. of 16 thousand acres of potatoes. This is quite a tool for farmers.
http://phys.org/news/2014-11-nasa-team-advances-next-generation-3d-imaging.html
And one of many examples......
http://phys.org/news/2014-12-archaeologists-reveal-layout-medieval-city.html
I installed a receiving station in 93. We had real time monitoring of moisture content and temp. of 16 thousand acres of potatoes. This is quite a tool for farmers.