http://www.history.noaa.gov/stories_tales/geod1.html
http://www.wfps.org/files/pdf_files/Dave Gibson Article.pdf
http://proceedings.esri.com/library/userconf/proc11/papers/4045.pdf
http://water.usgs.gov/osw/gps/
http://knowledge.autodesk.com/support/autocad-civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Civil3D-DataTranslation/files/GUID-72F200DA-1F1B-46A7-BD6C-FBBDC6A004F5-htm.html
Surface Import Settings Dialog Boxhttp://knowledge.autodesk.com/support/autocad-civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Civil3D-DataTranslation/files/GUID-041C216A-DFF0-4234-91F6-2AD0E230D0B9-htm.htmlTo Export Surface Data to a LandXML Filehttp://knowledge.autodesk.com/support/autocad-civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Civil3D-UserGuide/files/GUID-1E79303D-C417-4BF2-A533-A5F8222EF840-htm.htmlAbout LandXML Import and Exporthttp://knowledge.autodesk.com/support/autocad-civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Civil3D-UserGuide/files/GUID-C77216E8-09FA-4D63-8182-400E9C2DB0A4-htm.htmlExport Surface to LandXMLhttp://envisioncad.com/video-tips/exporting-civil-3d-data-to-landxml/
http://www.pobonline.com/articles/96996-how-can-drones-transform-surveying