华南农作物覆盖区土壤水分ENVISAT-ASAR与MODIS数据联合反演算法研究

被引:10
作者
刘万侠
刘旭拢
王娟
曾文华
机构
[1] 广州地理研究所广东省遥感与地理信息系统应用重点实验室
关键词
合成孔径雷达; 土壤水分; 后向散射系数;
D O I
暂无
中图分类号
S152.7 [土壤水分];
学科分类号
摘要
准确、及时地获取大面积地表土壤水分信息在农业科学领域具有较大的应用潜力。本文以地域特色突出的广东省徐闻县为试验区,联合使用双极化ENVISAT-ASAR数据和光学遥感MODIS数据,充分利用MODIS数据的高重复覆盖率,提取试验日期内的归一化差分水指数(NDWI),计算各试验点所对应的植被含水量(VWC)数据,相较于NDVI,NDWI具有不易饱和的特点,更加适合于本次研究所在的高植被覆盖区。最后利用"水—云模型"从ASAR数据总的后向散射中去除植被的影响,建立裸土后向散射系数与实测土壤含水量之间的关系,拟合结果VV极化优于HH极化,相关系数为VV极化R=0.865,HH极化R=0.676,总体上针对农作物覆盖地表土壤水分变化的估算算法还需要更进一步发展和改进,以提高反演精度。
引用
收藏
页码:39 / 43
页数:5
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