期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2011
卷号：23
页码：41-44
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：Since 1991, a number of European satellites have acquireddata of the Earth’s surface for environmental monitoring.In general, a satellite will orbit the Earth in about 1½ hoursand it takes 35 days before an ERS or ENVISAT satelliterepeats radar scanning of the same position. For younger generations of satellites, such as RADARSAT and TERRA, thescanning repeat interval has decreased to 24 and 11 days, respectively, so that hundreds of radar scenes of the same place,produced over the past c. 20 years, are now available.
