. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: Remote Sens Environ. 2018 Aug 12;217:72–85. doi: 10.1016/j.rse.2018.08.005
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).