51. Effect of DEM Inaccuracy on Precision of Satellite InSAR Results
- Author
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Ivana Hlavacova, Matúš Bakoň, and Milan Lazecký
- Subjects
Deformation monitoring ,Interferometry ,Geography ,law ,Interferometric synthetic aperture radar ,Phase (waves) ,Terrain ,Satellite ,Stereoscopy ,Deformation (meteorology) ,Geodesy ,law.invention ,Remote sensing - Abstract
This short paper summarizes the effects of DEM errors influencing precision of deformation monitoring results using satellite SAR interferometry and presents basic mathematical approaches to quantify DEM accuracy needed for proper estimation of SAR interferometry parameters. While in case of appropriately large SAR dataset for Multi-Temporal Interferometry (MTI) processing the height difference is usually well estimated, still DEM accuracy should be carefully considered in case of using low number of images—and especially in case of processing differential InSAR with only one image pair. Depending on the interferogram pair combination characteristics, especially parameter known as perpendicular baseline (Bperp) describing the distance between satellite positions during their image acquisitions, the interferogram is more or less prone to DEM accuracy errors. In case of higher Bperp, a relatively high quality DEM is necessary to remove stereoscopic effect apparent in interferogram in order to distinguish interferogram phase element caused by temporal terrain deformation.
- Published
- 2015
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