Print Email Facebook Twitter On the value of corner reflectors and surface models in InSAR precise point positioning Title On the value of corner reflectors and surface models in InSAR precise point positioning Author Yang, M. (TU Delft Mathematical Geodesy and Positioning; Wuhan University) Lopez Dekker, F.J. (TU Delft Mathematical Geodesy and Positioning) Dheenathayalan, P. (TU Delft Mathematical Geodesy and Positioning) Liao, Mingsheng (Wuhan University) Hanssen, R.F. (TU Delft Mathematical Geodesy and Positioning) Date 2019 Abstract To correctly interpret the estimated displacements in InSAR point clouds, especially in the built environment, these need to be linked to real-world structures. This requires the accurate and precise 3D positioning of each point. Artificial ground control points (GCPs), such as corner reflectors, serve this purpose, but since they require efforts and resources, there is a need for criteria to assess their usefulness. Here we evaluate the value and necessity of using GCPs for different scenarios, concerning the required efforts, and compare this to alternatives such as digital surface models (DSM) and advanced (geo) physical corrections. We consider single-epoch as well as multi-epoch GCP deployment, reflect on the number of GCPs required in relation to the number of SAR data acquisitions, and compare this with digital surface models of different quality levels. Analyzing the geolocation performance using TerraSAR-X and Sentinel-1 data, we evaluate the pros and cons of various deployment options and show that the multi-epoch deployment of a GCP yields optimal geolocalization results in terms of precision, accuracy, and reliability. Subject Corner reflectorGeolocalizationLiDAR DSMPersistent scattererSARSynthetic aperture radar interferometry To reference this document use: http://resolver.tudelft.nl/uuid:f7d73795-9891-48c6-8aae-b5348afec0d3 DOI https://doi.org/10.1016/j.isprsjprs.2019.10.006 Embargo date 2021-10-25 ISSN 0924-2716 Source ISPRS Journal of Photogrammetry and Remote Sensing, 158, 113-122 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 M. Yang, F.J. Lopez Dekker, P. Dheenathayalan, Mingsheng Liao, R.F. Hanssen Files PDF main.pdf 4.62 MB Close viewer /islandora/object/uuid:f7d73795-9891-48c6-8aae-b5348afec0d3/datastream/OBJ/view