title: [The study of LAI estimation using a new vegetation index based on CHRIS data].
abstract: Leaf area index (LAI) is an important structural parameter of vegetation canopy, the correct estimation of which has been the focus in the remote sensing community. As a kind of hyperspectral and multi-angle remote sensing data with higher resolution (17 m), PROBA/CHRIS has significant application value in LAI inversion. In the present paper, the analytical two-layer canopy reflectance model (ACRM) was used to simulate a series of reflectances with different LAI values. Based on this, a new vegetation index was built and successfully applied to LAI inversion of PROBA/CHRIS image data. Our results indicated that: compared with the spectral index NDVI and multi-angle index HDS, the new index could make better use of spectrum and multi-angle messages and have a better correlation with LAI of the study area; moreover, the correlation coefficient R2 reached up to 0.734 7. And in order to obtain the figure of LAI distribution of the study area, we used the optimal fit equation between LAI and HDVI to estimate LAI, and the accuracy of the RMSE was 0.619 8.
authors.affiliation: The State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China. muzixin8866@163.com
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Wang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Niu
authors.forename: Xue-Hui
authors.initials: XH
authors.lastname: Hou
authors.forename: Shuai
authors.initials: S
authors.lastname: Gao
mesh_terms: D002734:Chlorophyll / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D008962:Models, Theoretical; D010788:Photosynthesis / Q000502:physiology*; D018515:Plant Leaves / Q000737:chemistry*; D058998:Remote Sensing Technology; D017215:Satellite Communications; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*
chemical_list: D002734:Chlorophyll