Title: Geometric Quality Testing of the Kompsat-2 Image Data Acquired over the JRC Maussane Test Site using ERDAS LPS and PCI GEOMATICS remote sensing software
Publisher: Publications Office of the European Union
Publication Year: 2010
JRC N°: JRC60285
ISBN: 978-92-79-17007-2
ISSN: 1018-5593
Other Identifiers: EUR 24542 EN
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC60285
DOI: 10.2788/21463
Type: EUR - Scientific and Technical Research Reports
Abstract: This report presents the geometric quality results recorded for the four samples of the Kompsat-2 radiometrically corrected images (processing level 1R) acquired over the JRC Maussane Terrestrial Test Site. The objective of this study is threefold: - to evaluate the planimetric accuracy in a routine basis production of orthorectified Kompsat-2 imagery; - to determine the optimal number and spatial distribution of the GCPs (Ground Control Points) for the Kompsat-2 orthorectification process; - to check if the orthorectified imagery of the Kompsat-2 optical sensor fall within the required accuracy criteria for the CwRS 1:10.000 scale of absolute 1-D RMSE of < 2.5m. The key issues identified during the geometric quality testing based on the limited Kompsat-2 sample images that were made available to us are as follows: 1. The 1-D RMS errors measured on the final K2 orthoimage after the single scene correction applying either the PCI rigorous model or the PCI RPC-based or the ERDAS RPC-based model are not sensitive to the number of GCPs used if they are well-distributed and range between 9 and 15 (provided a DTM with 0.6m vertical accuracy); and are sensitive to the overall off-nadir angle and increase with increasing off-nadir angle. 2. The average 1-D RMSE are 2.1m and 4m, while the maximum 1-D RMSE values are 3.2m and 6.2m of Easting and Northing direction respectively, provided a DTM with 0.6m vertical accuracy, and the GCPs with 0.05m < RMSEx, RMSEy < 0.90m are used. 3. The orthorectified Kompsat-2 imagery do not fall within the accuracy criteria of the CwRS 1:10.000 scale requirements, i.e. an absolute 1-D RMSE of < 2.5m (tab.20) except where the imagery is characterised by an overall off-nadir angle close to zero degrees and the rigorous model or first order Rational Polynomial sensor model is applied.
JRC Directorate:Space, Security and Migration

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