@CONFERENCE\{IMM2019-07141, author = "A. A. Nielsen and H. Skriver and K. Conradsen and M. J. Canty", title = "Change detection in polarimetric synthetic aperture radar data", year = "2019", month = "sep", booktitle = "Nordic Remote Sensing Conference (NoRSC)", volume = "", series = "", editor = "", publisher = "", organization = "", address = "{AIAS,} Aarhus, Denmark", url = "http://imm.dtu.dk/pubdb/p.php?7141", abstract = "Based on an omnibus likelihood ratio test statistic for the equality of several variance-covariance matrices following the complex Wishart distribution and a factorization of this test statistic with associated p-values, change analysis in a time sequence of multilook polarimetric {SAR} data in the covariance matrix representation is carried out. The omnibus test statistic and its factorization detect if and when change occurs. Also, a measure of change direction is calculated. Using spaceborne dual polarization Sentinel-1 and full polarization Radarsat-2 data this contribution focuses on change detection based on the p-values, on visualization of change at pixel as well as segment level, and on computer software for local as well as cloud processing." }