TY - JOUR
T1 - On the value of corner reflectors and surface models in InSAR precise point positioning
AU - Yang, Mengshi
AU - Lopez Dekker, Paco
AU - Dheenathayalan, Prabu
AU - Liao, Mingsheng
AU - Hanssen, Ramon
N1 - Accepted Author Manuscript
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
KW - Corner reflector
KW - Geolocalization
KW - LiDAR DSM
KW - Persistent scatterer
KW - SAR
KW - Synthetic aperture radar interferometry
UR - http://www.scopus.com/inward/record.url?scp=85073944773&partnerID=8YFLogxK
U2 - 10.1016/j.isprsjprs.2019.10.006
DO - 10.1016/j.isprsjprs.2019.10.006
M3 - Article
SN - 0924-2716
VL - 158
SP - 113
EP - 122
JO - ISPRS Journal of Photogrammetry and Remote Sensing
JF - ISPRS Journal of Photogrammetry and Remote Sensing
ER -