A Dutch team of researches have created a system to measure the Earth's change in water surface area. Their finding showed some construction that weren't declared (a dam in North Korea) and others than weren't realized (Lake Mead is drying up, bad news for California). The system is designed to diagnose and not treat, but that doesn't take away from the utility of the tool.

Source: http://phys.org/news/2016-08-surface-area-years.html

Image Source: By Afghanistan Matters from Brunssum, Netherlands (Water and EarthUploaded by GiW) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons