• Journal of Geo-information Science
  • Vol. 22, Issue 2, 308 (2020)
Yunkai GUO1、1、2、2, Xiaojiong ZHANG1、1、2、2、*, Min XU1、1、2、2, Yuling LIU1、1, Jia QIAN1、1, and Qiong ZHANG1、1
Author Affiliations
  • 1School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410014, China
  • 1长沙理工大学交通运输工程学院,长沙 410014
  • 2Institute of Surveying and Mapping Remote Sensing Application Technology, Changsha University of Science & Technology, Changsha 410076, China
  • 2长沙理工大学测绘遥感应用技术研究所,长沙 410076
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    DOI: 10.12082/dqxxkx.2020.190254 Cite this Article
    Yunkai GUO, Xiaojiong ZHANG, Min XU, Yuling LIU, Jia QIAN, Qiong ZHANG. Estimation Model of Equivalent Water Thickness in the Road Area[J]. Journal of Geo-information Science, 2020, 22(2): 308 Copy Citation Text show less
    Comparison of estimated EWT by three models
    Fig. 1. Comparison of estimated EWT by three models
    Fitting relationship between predicted and measured values of EWT
    Fig. 2. Fitting relationship between predicted and measured values of EWT
    输入参数输入值
    结构参数(N1.22
    叶绿素含量(Cab)/(μg/cm242.93
    类胡萝卜素含量(Car)/(μg/cm28
    褐色素含量(Cbrown)/(μg/cm20
    干物质重量(Cm)/(μg/cm20.02316
    平均叶倾角(LAD30
    叶面积指数(LAI4~6,步长:0.2
    等效水厚度(EWT0.01~0.03,步长:0.001
    热点参数(hspot0.15
    太阳天顶角(θs)/°23.9
    观测天顶角(θv)/°0
    土壤反射率(rsoil0.2
    Table 1. Input parameters of the PRO4SAIL model
    水分指数计算公式公式编号参考文献
    新近红外肩部区域光谱比值指数(Spectral Ratio Index in theNIR Shoulder Region, NSRI)NSRI=ρ890ρ780(1)[15]
    水分指数(Water Index, WI)WI=ρ900ρ970(2)[15]
    归一化差值植被指数(Normalized difference vegetation index, NDVI)NDVI=(ρ860-ρ680)(ρ860+ρ680)(3)[15]
    归一化差值红外指数 (Normalized Difference Infrared Index, NDII)NDII=(ρ850-ρ1650)(ρ850+ρ1650)(4)[15]
    Datt水分指数(DattWater Index, DWI)DWI=(ρ816-ρ2218)(ρ816+ρ2218)(5)[15]
    简单水比指数(Simple Ratio Water Index, SRWI)SRWI=ρ860ρ1240(6)[15]、[20]
    湿度胁迫指数(Moisture Stress Index, MSI)MSI=ρ1600ρ819(7)[15]、[19]
    水比指数(Simple Ratio, SR)SR=ρ895ρ675(8)[15]
    归一化差值水分指数(Normalized Difference Water Index, NDWI)NDWI=(ρ860-ρ1240)(ρ860+ρ1240)(9)[15]
    归一化多波段干旱指数(NormalizedMulti-band Drought Index, NMDI)NMDI=ρ860-(ρ1640-ρ2130)ρ860+(ρ1640+ρ2130)(10)[15]
    全球植被水分指数(Global Vegetation Moisture Index, GVWI)GVWI=(ρ820+0.1)-(ρ1600-0.02)(ρ820+0.1)+(ρ1600+0.02)(11)[18]
    土壤调整植被指数(Soil Adjusted Vegetation Index, SAVI)SAVI=ρ860-ρ680×(1+L)(ρ860+ρ860+L),L=0.5(12)[18]
    Table 2. Twelve different water indices
    特征编号植被指数重要性特征编号植被指数重要性
    1NDWI0.22417DWI0.0678
    2NMDI0.19328MSI0.0571
    3SRWI0.15819SAVI0.0491
    4SR0.073410NSRI0.0301
    5NDII0.072311NDVI0.0033
    6WI0.071112GVWI0.0003
    Table 3. Importance analysis and ordination between the water indices and EWT
    反演模型建模样本预测样本
    自变量应变量自变量应变量
    PLSPRO4SAIL模拟NDWINMDISRWISRPRO4SAIL模拟EWT实测NDWINMDISRWISR实测EWT
    SVMPRO4SAIL模拟NDWINMDISRWISRNDIIWIDWIMSISAVIPRO4SAIL模拟EWT实测NDWINMDISRWISRNDIIWIDWIMSISAVI实测EWT
    GA-SVMPRO4SAIL模拟NDWINMDISRWISRPRO4SAIL模拟EWT实测NDWINMDISRWISR实测EWT
    Table 4. Descriptive statistics of the data samples for modeling and validation
    Yunkai GUO, Xiaojiong ZHANG, Min XU, Yuling LIU, Jia QIAN, Qiong ZHANG. Estimation Model of Equivalent Water Thickness in the Road Area[J]. Journal of Geo-information Science, 2020, 22(2): 308
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