设为首页
加入收藏
从MODIS资料提取土壤湿度信息的主成分分析方法
Principal Component Analysis Method Acquiring Soil Moisture Information from MODIS Data
-
摘要: 沿袭了遥感地物分类中K-L变换思想, 以归一化处理后的遥感数据, 结合地面土壤湿度观测数据, 应用主成分分析方法, 采用MODIS不同红外波段数据, 通过相关关系计算, 在监测结果中融合MODIS具有250 m分辨率的第2波段数据, 建立了青海省多维特征空间土壤湿度监测模型。模型的建立克服了热惯量法监测干旱需多时相遥感数据的缺陷, 经初步检验, 此模型可以在一定精度范围之内监测表层土壤湿度, 具有业务应用潜力。Abstract: Monitoring soil moisture exactly is very important. Soil moisture is one important factor of agricultural meteorology, which can reflect humid condition of soil, and is a main base to forecast drought of farmland. But it is influenced by too many factors, so it is difficult to monitor real-time soil moisture of largescale areas. General method such as soil sampling method, neutron probe method and TDR method takemuch time and efforts, and can only monitor limited spots. However, the development of remote sensingtechnology can provide assistance to monitoring real-time soil moisture of large-scale areas dynamically.Thermal inertial is a matured technological method to monitor bare soil moisture applying MODIS data. But it needs remote sensing data of both daytime and nighttime, which is difficult to obtain in practicaloperation. It inherits the idea of K-L transformation that is applied in the remote sensing system of targetclassification, uses principal component analysis, regression analysis, residual image, and relative reflection of internal average methods to correct remote sensing radiation data, and establishes soil moisturemodel of multiple-dimensional feature space based on mono temporal normalized MODIS data.Then the result from the image of monitoring is obtained and checked up. Monitored and model results of 35 spots are compared, and the accuracy of the model is 80%. It shows that the model has potentialto be applied in operation. More problems are discussed, including representative of the data, the calibration of remote sensing detector and so on.
-
Key words:
- MODIS data;
- soil moisture;
- principal component analysis
-
图 1 利用主成分分析方法特征空间变换
Fig. 1 Spacial characteristic transformation by principal component analysis
图 2 第1主成分与土壤湿度回归结果
Fig. 2 Regression result of principal component factors and soil moisture
表 1 图像融合各要素相关系数
Table 1 Correlation coefficient of factors in image infusing
表 2 遥感监测值和实测值对照(单位: %)
Table 2 Comparison between RS monitoring value data and observing data(unit : %)
-
[1] 崔彩霞, 杨青, 杨莲梅. M ODIS资料用于塔克拉玛干沙漠地表温度计算方法初探.中国沙漠, 2003, 23(5):596-598. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGSS200305024.htm [2] 申广荣, 田国良.作物缺水指数监测旱情方法研究.干旱地区农业研究, 1998, 16(1): 123-128. http://www.cnki.com.cn/Article/CJFDTOTAL-GHDQ801.021.htm [3] Watson K, Pohn H A.Thermal inertia mapping from satellites discrimination of geologic units in Oman.J Res Geol Surv, 1974, 2(2): 147-158. [4] John C.Price, thermal inertia mapping :A new view of the earth.J Geophys Res, 1982, 87: 2582-2590. [5] 张仁华.土壤含水量的热惯量模型及其应用.科学通报, 1991, 36(12): 924-927. http://www.cnki.com.cn/Article/CJFDTOTAL-KXTB199112013.htm [6] 肖乾广, 陈维英, 盛永伟, 等.用气象卫星检测土壤水分的实验研究.应用气象学报, 1994, 5(3): 312-318. http://qk.cams.cma.gov.cn/jams/ch/reader/view_abstract.aspx?file_no=19940355&flag=1 [7] 王鹏新, 龚健雅, 李小文.条件温度植被指数及其在干旱监测中的应用.武汉大学学报, 2001, 26(5): 412-418. http://www.cnki.com.cn/Article/CJFDTOTAL-WHCH200105006.htm [8] 刘志明, 张柏, 晏明, 等.土壤水分与干旱遥感研究的进展与趋势.地球科学进展, 2003, 18(4) :576-581. http://www.cnki.com.cn/Article/CJFDTOTAL-DXJZ200304014.htm [9] 田国良.黄河流域典型地区遥感动态研究.北京:科学出版社, 1990: 122-132. [10] 余涛, 田国良.热惯量法在监测土壤表层水分变化中的研究.遥感学报, 1997, 1(1) : 24-31. http://www.cnki.com.cn/Article/CJFDTOTAL-YGXB199701002.htm [11] 刘安麟, 李星敏, 何延波, 等.作物缺水指数法的简化及在干旱遥感监测中的应用.应用生态学报, 2004, 15(2): 210-214. http://www.cnki.com.cn/Article/CJFDTOTAL-YYSB200402007.htm [12] 郭广猛, 赵冰茹.使用MODIS数据监测土壤湿度.土壤, 2004, 36(2): 219-221. http://www.cnki.com.cn/Article/CJFDTOTAL-TURA200402021.htm [13] 马霭乃.遥感信息模型.北京:北京大学出版社, 1997. [14] 赵英时.遥感应用分析原理与方法.北京:科学出版社, 2003. [15] 梅安新.遥感导论.北京:高等教育出版社, 2001. [16] 王晓云, 郭文利, 奚文, 等.利用" 3S"技术进行北京地区土壤水分监测应用技术研究.应用气象学报, 2002, 13(4):422-429. http://qk.cams.cma.gov.cn/jams/ch/reader/view_abstract.aspx?file_no=20020457&flag=1 [17] 吴贤云, 丁一汇, 王琪.近40年长江中下游地区旱涝特点分析.应用气象学报, 2006, 17(1): 19-26. http://qk.cams.cma.gov.cn/jams/ch/reader/view_abstract.aspx?file_no=20060103&flag=1 [18] 延昊, 张国平.混合像元分解法提取积雪盖度.应用气象学报, 2004, 15(6): 665-671. http://qk.cams.cma.gov.cn/jams/ch/reader/view_abstract.aspx?file_no=20040681&flag=1 -
下载:
图(3) / 表(2)
计量
- 摘要浏览量: 4514
- HTML全文浏览量: 797
- PDF下载量: 1911
- 被引次数: 0
