As compared to other SPOT satellites, SPOT5 geometric accuracy is improved : a stellar sensor unit allows absolute location accuracy of 60 meters; geometric resolution is 10 meters for multispectral mode, 5 meters for panchromatic mode and 2,5 meters for THR mode; HRS along track stereoscopic mode leads to 10 meters accuracy digital terrain models. This paper presents the results of in-flight geometric characterization of SPOT5 remote sensing satellite established during the first two months of SPOT5's life in orbit. Calibration of the viewing model has been performed : platform's biases and modelization of mirror positioning are measured thanks to a triangulation process using images acquired on several targets around the world chosen for their referential ground control points. Geometric performances of THR mode was precisely measured thanks to the comparison of the two images of the quincunx mode. Multispectral registration was measured using correlation methods. The viewing model includes a description of the focal plane with each detector viewing angle. This description was improved for HRS and HRG cameras thanks to a reference composed of a set of aerial photographs. Finally, a first evaluation of HRS' DTM accuracy has been done by comparison to a reference DTM over FRANCE. Multispectral and SWIR Panchromatic double detection line 6ytÃhpxÃqvrpv 6pÃhpxÃqvrpv ≈ 7.5 km. ≈ 7.5 km. Fig. 1 : SPOT5 focal plane Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/10/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 4881 213 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/10/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 4881 215 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/10/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 4881 219 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/10/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
Following SPOT5 launch, SpotImage and French National Geographic Institute (IGN) have decided to design a worldwide accurate database called Reference3D™ using data from the High Resolution Stereoscopic SPOT5 instrument (HRS). SpotImage and IGN have also decided to develop and commercialize a system called ANDORRE to produce orthorectified images thanks to Reference3D™ data. ANDORRE has been designed to take advantage of Reference3D™ planimetric and altimetric accuracy to automatically register and rectify any image from SPOT satellites. In this framework, CNES is acting as prime contractor to realize and industrialize the algorithms following a preliminary study undertaken by IGN. This paper focuses on the validation of the geometric performances of the algorithms. A special attention is also paid to the processing time in order to achieve the rectification of a 24000x24000 image in less than one hour.
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