收稿日期: 2001-09-17
修回日期: 2002-01-31
网络出版日期: 2002-10-01
基金资助
国家自然科学基金重点项目“新型成像雷达对地观测机理及地物识别技术” （编号：49989001）；中国科学院遥感应用研究所创新课题（编号：CX0100001）联合资助.
RELATIONSHIP BETWEEN COHERENCE OF SAR INTERFEROMETRY AND SURFACE FEATURE IN ACRID TO SEMI-ACRID AREA
Received date: 2001-09-17
Revised date: 2002-01-31
Online published: 2002-10-01
廖静娟 , 郭华东 , 邵芸 , N．Veneziani . 成像雷达干涉测量数据相关性与干旱—半干旱地区地表类型特征的关系[J]. 地球科学进展, 2002 , 17(5) : 648 -652 . DOI: 10.11867/j.issn.1001-8166.2002.05.0648
At recent years, imaging radar interferometric technique with its all weather, day and night capabilities, can generate the digital elevation model (DEM) and monitor surface change using amplitude and phase information from radar signal. So it has become a potential tool to acquire more resource and environmental information. The repeat-pass interferomety acquires two images by using one antenna for repeat passes over the same area at two different times. The two images can be used for further information extraction only while they have somewhat coherence.
This paper presented the results of discrimination and classification of surface land types in Kashi test site, Xinjing of northwestern China using the repeat-pass interferometric data, acquired by European Resource Satellite 1 and 2, based on the interferometric coherence estimation and amplitude intensity. Six types of land were discriminated and classified, including in bare soil, salina, bush, bare rock/gobi, marsh and water body. Then the backscatter and coherence characteristics of these land types were analyzed, and the relationship between coherence and surface features in acrid and semi-acrid area was also discussed. Bare soil and dry salina have high coherence, but their backscatter coefficients are different. Bush has middle coherence, and the backscatter feature is similar to bare soil. Wet salina and bare rock/gobi have low coherence, and have the different backscatter coefficients. Marsh and water body have the lowest coherence, and their backscatter features are different.
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