Shadowing effects on SPOT-HRV and high spectral resolution reflectances in Christmas tree plantations

Autor:	Hardy B. Granberg, Brigitte Leblon, S.-D. Charland
Rok vydání:	1996
Předmět:	Canopy Shadow medicine General Earth and Planetary Sciences Plant cover Enhanced vegetation index Interception medicine.symptom Vegetation (pathology) Normalized Difference Vegetation Index Multispectral pattern recognition Mathematics Remote sensing
Zdroj:	International Journal of Remote Sensing. 17:277-289
ISSN:	1366-5901 0143-1161
DOI:	10.1080/01431169608949005
Popis:	Shadowing is one of the factors that most affects the relation between canopy reflectance and forest light interception efficiency. For Christmas tree plantations, a decreasing exponential function can assess the shadow proportion from canopy SPOT-HRV red or green reflectances. Near-infrared reflectances as well as the wavelength of the inflexion point in the red-edge region (λi) are not affected by shadowing in the canopy. The linear correlation coefficients calculated between the shadow proportion and three common vegetation indices (Normalized Difference Vegetation Index, Perpendicular Vegetation Index and the Transformed Soil Adjusted Vegetation Index) estimated with the SPOT-HRV reflectances are non-significant in the case of PVI and TSAVI (if it is calculated with green reflectances). The limits and possible improvements of such a study are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c45a232278e7a0345b21f23fb3d20252 https://doi.org/10.1080/01431169608949005 Zobrazit plný text záznamu