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Principle of High-resolution Airborne SAR Aerial triangulation supported by sparse GCPs
Lei Pang1,3, Jixian Zhang1, Mingbo Zhang3
1Chinese Academy of Surveying and Mapping
Tel: 86 10 88229545, Fax: 0086 10 68211420
Email: Panglei.mail@163.com,
stecsm@public.bta.net.cn
Address: Beitaiping road 16, Haidian district, Beijing, P. R. China 100039
2Shandong University of Science and Technology
Phone: +86 538 6226813(0), Fax :( 0538) 6226163
Address: Institute of Geosciences, Shandong University of Science and Technology, Taian, Shandong, P. R. China, 271019
3Institute of Geographical Sciences and Natural Resources Research, CAS
Phone: +86 10 64861632-184, Fax :0086 10 64851844
Email: zhangmb@lreis.ac.cn
Address: Datun Road 3, Chaoyang district, Beijing, P. R. China 100101
Abstract
At present, a great deal of western area in China has still lacked of corresponding relief maps. Because of the cloudy or soupy mountainous conditions in these districts, the high resolution airborne SAR imagery has often been chose as the irreplaceable data resource, while remote sensing cartography technique being performed. At the same time, the mission that how to acquire enough accuracy and quantity of ground control points (GCPs), which difficult to be measured in practical, has become an urgent demand for mapping tasks. This paper analyzes the practical conditions, and divides it into two instances, that is, which with and without navigation data provided from GPS/INS system. It discusses the aerial triangulation theory from airborne SAR images, with which only sparse GCPs around the mapping area could be provided, puts forward the corresponding mathematical model, and sequent technique flow, according of which we can obtain the coordinates of the required GCPs for cartography. Lastly, the airborne SAR imagery of 1m-resolution, in the area of Zhengzhou, in China, has been taken as an experiment data to validate the model, and a corresponding accuracy analysis derived from the developed software has been presented.
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