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Evaluation of a 2-D transformation model for georeferencing of Synthetic Aperture RADAR imagery | ||
| Earth Observation and Geomatics Engineering | ||
| مقاله 1، دوره 3، شماره 1، شهریور 2019، صفحه 1-11 اصل مقاله (1.16 M) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22059/eoge.2019.248253.1018 | ||
| نویسندگان | ||
| Majid Esmaeilzadeh؛ Jalal Amini* | ||
| School of Surveying and Geospatial Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| چکیده | ||
| The Synthetic Aperture Radar (SAR) geometry imaging includes geometric distortions, which cause errors. To compensate the geometric distortions, the information about sensor position, imaging geometry, and target altitude from ellipsoid should be available. In this paper, a method for geometric calibration of SAR images is proposed. The method uses Range-Doppler (RD) equations. In this method, the georeferencing is carried out using the Digital Elevation Model (DEM) and also exact ephemeris data of the sensor. First, the digital elevation model is transferred to the range and azimuth directions. Then, the original image is registered to the transferred DEM from the previous step with transformation equations: conformal, affine, and projective. The advantage of the method described in this article is the elimination of required control points and rotational parameters of the sensor. Since the ground range resolution of used images is about 30m, in best stance, the geocoded images using the method described in this paper have an accuracy of about 20m (subpixel) in planimetry and of about 33m in altimetry. | ||
| کلیدواژه‌ها | ||
| Range-Doppler؛ Digital Elevation Model؛ Transformation؛ Georeferencing؛ Topographic errors | ||
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آمار تعداد مشاهده مقاله: 305 تعداد دریافت فایل اصل مقاله: 439 |
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