8Moore LR,Kunert W A.U.S.Geological Survey Digital Raster Graphics[C]// ACSM/ASPRS' 95,Vol.1:281-286.
9LeToan T,Lanr H,Mougin E.Multitiple and dual-polarization observations of agricultural vegetation covers by X-band SAR images[J].IEEE TransGeosciRemote Sensing,1989,27(06):709 717.