以江苏省海安县为研究区,使用2008年获取的日本ALOS卫星PALSAR双极化模式数据,分析水稻在L波段SAR图像上的后向散射特征,并提出相应的水稻制图方法。水稻在L波段上表现出了和C波段相同的时相变化特征。HH极化后向散射依赖于水稻植株的空间分布结构,某些机械插秧区域的布拉格共振现象引起水稻后向散射严重增强,给利用PALSAR数据水稻制图带来了困难。而HV极化不存在布拉格共振现象。在考虑布拉格共振影响的条件下,提出了联合PALSAR双极化模式HH和HV极化数据、基于时相变化特征进行水稻制图的方法,获得了88.4%的制图精度。 更多还原
【Abstract】 Fine beam dual polarization data onboard Advanced Land Observing Satellite-Phased Array type L-band Synthetic Aperture Radar(ALOS PALSAR) for Hai’an,Jiangsu,China acquired in 2008 were used to analyze rice backscatter features at L-band SAR for the development of rice mapping method.Similar temporal change trend of backscatter was observed at L-band SAR to that of C-band.With the dependence of HH backscatter on the spatial distribution structure of the rice canopy,Bragg resonance scattering has ...