SAR data processing
The processing of SAR satellite imagery is known as InSAR, which is a remote sensing technique used to measure ground movement. Measurement point clouds can cover any size area, from individual buildings to entire countries, while providing millimeter level precision. In this presentation, after providing a brief introduction to the technology, we will discuss case studies at different scales and applications from different sectors, including single building analyses, natural hazards, a sinkhole study, and the state-wide monitoring currently being performed for the State of California.
David F. Maune, PhD, CP, CFM, PSM, PS, GS, SP
Dr. Dave Maune is Chief Scientist in Dewberry’s Geospatial and Technology Services Department. He is a retired Army Colonel in the U.S. Army Corps of Engineers, last serving as Director, U.S. Army Topographic Engineering Center (TEC). He edited and authored three ASPRS textbooks on Digital Elevation Models and co-authored the ASPRS positional accuracy standards. He was a pioneer for digital photogrammetry and lidar, and he recently completed the aerial IfSAR mapping for the entire state of Alaska. He is now pursuing statewide coastal mapping of Alaska, geophysical surveys for the Earth MRI initiative, and Differential SAR for mapping of subsidence.
Role of DInSAR in Proactive Management of Subsidence
This presentation summarizes subsidence problems in eight locations: (1) Venice, Italy; (2) Mekong Delta, Vietnam; (3) San Joaquin Valley, California; (4) Houston-Galveston, Texas; (5) New Orleans, Louisiana; (6) Alaska; (7) Traverse City, Michigan; and (8) Coastal Virginia. It gives report-card style grades of F for only reacting to subsidence that occurred; D for predicting subsidence; C of mapping annual subsidence rates and “hot spots,” preferably with DInSAR; B for mitigating the effects of subsidence; and A for reducing the cause of subsidence. It briefly addresses how surveyors should drive stainless steel rods to bedrock or refusal in areas of subsidence so that benchmarks do not subside with the surrounding terrain.