Volume 6, Issue 2, December 2018, Page: 89-99
Very High Resolution Mapping with the Pléiades Satellite Constellation
Roland Perko, Institute for Information and Communication Technologies, Joanneum Research, Graz, Austria
Hannes Raggam, Institute for Information and Communication Technologies, Joanneum Research, Graz, Austria
Mathias Schardt, Institute for Information and Communication Technologies, Joanneum Research, Graz, Austria
Peter Michael Roth, Institute of Computer Graphics and Vision, Graz University of Technology, Graz, Austria
Received: Aug. 16, 2018;       Accepted: Nov. 30, 2018;       Published: Dec. 24, 2018
DOI: 10.11648/j.ajrs.20180602.14      View  41      Downloads  26
The Pléiades satellite constellation provides very high resolution multi-spectral optical data at a ground sampling distance of about 0.7 m at nadir direction. Due to the highly agile pointing angle capacity in the range of ±47 degrees the sensors are optimal for detailed earth observation. They are able to collect stereo and tri-stereo datasets in one overflight with a swath width of 20 km. Such images allow 3D mapping of any region on the Earth’s surface at very high resolution with high accuracy, where the reconstruction of the heights is based on along-track stereo. This work presents methodologies and workflows within the fields of remote sensing and computer vision that are used (1) to densely reconstruct digital surface models (DSM), (2) to derive digital terrain models (DTM), and (3) to generate multi-spectral ortho-rectified products. Within this process, the accuracy of the geometric sensor models, given as rational polynomial coefficient (RPC) models, plays a crucial role. Therefore, an assessment is performed on two distinct test sites discussing the initial 2D geo-location accuracy of the given sensor models. An optimization scheme is presented to adjust the given RPC models yielding 3D geo-location accuracies of 0.5 m in planimetry and 1 m in height. In the frame of surface model generation important issues like epipolar rectification, hierarchical stereo matching, and fusion of heights are reported. The main outcomes are that the sensor accuracy is within the range as defined by Astrium, but that a sensor model optimization is obligatory when it comes to highly accurate 3D mapping. The presented workflow generates mapping products with a GSD of 0.5m. The derived DSMs and DTMs show a high level of detail, thus enabling varying applications on a large scale, like land cover and land use classification, change detection, city modelling, or forest assessment.
Pléiades, Sensor Model, Accuracy Analysis, 3D Mapping, Digital Surface Model, Digital Terrain Model
To cite this article
Roland Perko, Hannes Raggam, Mathias Schardt, Peter Michael Roth, Very High Resolution Mapping with the Pléiades Satellite Constellation, American Journal of Remote Sensing. Vol. 6, No. 2, 2018, pp. 89-99. doi: 10.11648/j.ajrs.20180602.14
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