期刊
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
卷 55, 期 1, 页码 162-169出版社
SCIENCE PRESS
DOI: 10.1007/s11433-011-4584-6
关键词
automatic extraction; lunar impact craters; Object-Oriented method; accuracy assessment; cumulative frequency analysis; Chang'E-1 data
资金
- National Natural Science Foundation of China [40871177, 41171332]
- Institute of Geographic
- Natural Resources Research, the Chinese Academy of Sciences [201001005]
The distribution characteristics of the impact craters can provide a large amount of information on impact history and the lunar evolution process. In this research, based on the digital elevation model (DEM) data originating from Change'E-1 CCD stereo camera, three automatic extraction methods for the impact craters are implemented in two research areas: direct extraction from flooded DEM data (the Flooded method), object-oriented extraction from DEM data by using ENVI ZOOM function (the Object-Oriented method) and novel object-oriented extraction from flooded DEM data (the Flooded Object-Oriented method). Accuracy assessment, extracted degree computation, cumulative frequency analysis, shape and age analysis of the extracted craters combined display the following results. (1) The Flooded Object-Oriented method yields better accuracy than the other two methods in the two research areas; the extraction result of the Flooded method offers the similar accuracy to that of the Object-Oriented method. (2) The cumulative frequency curves for the extracted craters and the confirmed craters share a similar change trajectory. (3) The number of the impact craters extracted by the three methods in the Imbrian period is the largest and is of various types; as to their age earlier than Imbrain, it is difficult to extract because they could have been destroyed.
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