The former provide decimetre vertical accuracy but with poor spatial coverage.
J. L. Bamber, J. L. Gomez-Dans, J. A. Griggs 2009, 'A new 1 km digital elevation model of the Antarctic derived from combined satelliteradar and laser data – Part 1: Data and methods', The Cryospherehttp://www.the-cryosphere.net/3/101/2009/tc-3-101-2009.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Based on our key findings we conclude that sub-decimetre terrain change (in this case coastal erosion) can be monitored.
Arko Lucieer, Steve Harwin 2012, 'Assessing the Accuracy of Georeferenced Point Clouds Produced via Multi-View Stereopsisfrom Unmanned Aerial Vehicle (UAV) Imagery', Remote Sensinghttp://www.mdpi.com/2072-4292/4/6/1573. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Kinematic real-time positioning applications with centimetre or decimetre levels could also evolve into a mass product.
W. Stempfhuber, M. Buchholz 2012, 'A PRECISE, LOW-COST RTK GNSS SYSTEM FOR UAV APPLICATIONS', The International Archives of the Photogrammetry, Remote Sensing and Spatial InformationScienceshttp://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXVIII-1-C22/289/2011/isprsarchives-XXXVIII-1-C22-289-2011.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)