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Proceedings Paper

Automatic SAR/optical cross-matching for GCP monograph generation
Author(s): Raffaele Nutricato; Alberto Morea; Davide Oscar Nitti; Claudio La Mantia; Luigi Agrimano; Sergio Samarelli; Maria Teresa Chiaradia
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Paper Abstract

Ground Control Points (GCP), automatically extracted from Synthetic Aperture Radar (SAR) images through 3D stereo analysis, can be effectively exploited for an automatic orthorectification of optical imagery if they can be robustly located in the basic optical images. The present study outlines a SAR/Optical cross-matching procedure that allows a robust alignment of radar and optical images, and consequently to derive automatically the corresponding sub-pixel position of the GCPs in the optical image in input, expressed as fractional pixel/line image coordinates. The cross-matching in performed in two subsequent steps, in order to gradually gather a better precision. The first step is based on the Mutual Information (MI) maximization between optical and SAR chips while the last one uses the Normalized Cross-Correlation as similarity metric. This work outlines the designed algorithmic solution and discusses the results derived over the urban area of Pisa (Italy), where more than ten COSMO-SkyMed Enhanced Spotlight stereo images with different beams and passes are available. The experimental analysis involves different satellite images, in order to evaluate the performances of the algorithm w.r.t. the optical spatial resolution. An assessment of the performances of the algorithm has been carried out, and errors are computed by measuring the distance between the GCP pixel/line position in the optical image, automatically estimated by the tool, and the “true” position of the GCP, visually identified by an expert user in the optical images.

Paper Details

Date Published: 18 October 2016
PDF: 8 pages
Proc. SPIE 10003, SAR Image Analysis, Modeling, and Techniques XVI, 1000303 (18 October 2016); doi: 10.1117/12.2241284
Show Author Affiliations
Raffaele Nutricato, GAP S.r.l. (Italy)
Alberto Morea, GAP S.r.l. (Italy)
Davide Oscar Nitti, GAP S.r.l. (Italy)
Politecnico di Bari (Italy)
Claudio La Mantia, Planetek Italia S.r.l. (Italy)
Luigi Agrimano, Planetek Italia S.r.l. (Italy)
Sergio Samarelli, Planetek Italia S.r.l. (Italy)
Maria Teresa Chiaradia, Politecnico di Bari (Italy)

Published in SPIE Proceedings Vol. 10003:
SAR Image Analysis, Modeling, and Techniques XVI
Claudia Notarnicola; Simonetta Paloscia; Nazzareno Pierdicca; Edward Mitchard, Editor(s)

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