Based on the CHRIS/PROBA hyperspectral remote sensing data,the authors retrieved the leaf area index (LAI) by A two-layer Canopy Reflectance Model (ACRM). The process consists of three main steps: Firstly,the high-spectral data was preprocessed and statistically analyzed. Secondly,sensitivity of the model to observing directions was analyzed. And finally,the best combinations of bands and parameters for the study area were chosen. The process was used to study the LAI of typical grass plots of Xilin River basin in Inner Mongolia. The results show that the application of CHRIS/PROBA data to the inversion of sparse grassland LAI is practical,and the multi-angle information of CHRIS/PROBA data has the potential advantages in decreasing the extent of LAI underestimation.
李新辉, 宋小宁, 冷佩. 利用CHRIS/PROBA数据定量反演草地LAI方法研究[J]. 国土资源遥感, 2011, 23(3): 61-66.
LI Xin-hui, SONG Xiao-ning, LENG Pei. A Quantitative Method for Grassland LAI Inversion Based on CHRIS/PROBA Data. REMOTE SENSING FOR LAND & RESOURCES, 2011, 23(3): 61-66.
[1] Cramer W,Kicklighter D W,Bondeau A.Comparing Global Models of Terrestrial Net Primary Productivity(NPP):Overview and Key Results [J].Global Change Biology,1999,5(S1),1-15.
[2] Seller P J,Randall D A,Collata G J,et al.A Revised Land Surface Parameterization(SiB2)for Atmospheric GCMs.Part I:Model Formulation [J].Journal of Climate,1996,9(4):676-705.
[6] Mannheim S,Segl K,Heim B,et al.Monitoring of Lake Water Quality Using Hyperspectral CHRIS-PROBA Data [C]//Proc of the 2nd CHRIS/Proba Workshop,ESA/ESRIN Frascati,2004:ESA SP-578.
[7] Barducci A,Guzzi D,Marcoionnip P.CHRIS-PROBA Performance Evaluation:Sigal-to-Noise Ratio,Instrument Efficiency and Data Quality form Acquisitions Over San Rossore Italy Test Site [C].Proc of the 3rd ESA CHRIS/PROBA Workshop Frascati,2005:21-23.
[9] Miltion T.The Contribution of CHRIS/PROBA to NCAVEO,A Knowledge Transfer Network for the Calibration and Validation of EO Data [C]//Proc of the 4th ESA CHRIS/PROBA Workshop Frascati,2006:19-21.
[10] Thuillier G,Hersé M,Labs D,et al.The Solar Spectral Irradiance from 200 to 2400 nm as Measured by the SOLSPEC Spectrometer from the ATLAS and EURECA Missions [J].Solar Physics,2003,214(1):1-22.
[11] Kuusk A.Two-Layer Canopy Reflectance Model ACRM User Guide Version [R].Tartu Observatory,2009:1-21.
[12] Verhoef W.Light Scattering by Leaf Layers with Application to Canopy reflectance Modeling:the SAIL Model [J].Remote Sensing of Environment,1984,16(2):125-141.
[13] Goel N S,Strebel D E.Inversion of Vegetation Canopy Reflectance Models for Estimating Agronomic Variables.I.Problem Definition and Initial Results Using the Suits Model [J].Remote Sensing Environment,1983,13(6):487-507.
[14] Kuusk A.The Hot Spot Effect in Plant Canopy Reflectance [C]//Myneni R B,Ross J,Editors.Photon-vegetation Interactions,Applications in Optical Remote Sensing and Plant Ecology.Berlin:Springer,1991:139-159.