Construction of new vegetation water index based on PROSPECT - VISIR model.

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Zdroj: Remote Sensing for Natural Resources; Jun2022, Vol. 34 Issue 2, p56-62, 7p
Abstrakt: In this paper' the leaf reflectance simulation data of visible to mid - infrared spectral range under the condition of different leaf parameters were obtained using the PROSPECT - VISIR leaf model. The spectral characteristic bands of vegetation leaves were analyzed to find the range of bands within which leaf reflectance is sensitive to changes in water content. On the basis of several common vegetation water indexes derived from visible and near - infrared bands' four new vegetation water index models were proposed by addition of the reflectance of the mid - infrared band' namely mid - infrared normalized diference infrared index ( NDII& ) ' mid - infrared normalized diference water index ( NDWIM) ' mid - infrared normalized multi - band drought index ( NMDIM) and mid - infrared normalized diference vegetation index ( NDVIM) . Based on the leaf reflectance simulation data' the sensitivity of four new vegetation water indexes and that of common water index to leaf water content were compared' and the quantitative relationship model between' on one hand' new vegetation water index and' on the other hand' leaf water content and dry matter content' was established. The fitting degree of NMDIM was 0. 972' showing the best performance. Finaly' a leaf water content estimation model was developed based on two new vegetation water indexes NMDIM and NDIIM so that accurate estimation of leaf water content can be achieved even when the dry matter content is unknown (the root mean square error of the model was 0.002 1 g/cm2 ) . [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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