Diurnal Patterns of Wheat Spectral Reflectances
作者： Paul J. Pinter , Ray D. Jackson , Sherwood B. Idso , Robert J. Reginato
关键词: Radiometry 、 Environmental science 、 Radiometer 、 Canopy architecture 、 Magnitude (astronomy) 、 Remote sensing 、 Spectral data 、 Atmospheric sciences 、 Vegetation 、 Azimuth 、 Altitude
摘要: Spectral reflectances of Produra wheat were measured at 13 different times the day Phoenix, Arizona, on April 14, 1979 using a nadir-oriented hand-held 4-band radiometer which had bandpass characteristics similar to those current LANDSAT satellites. Different sun altitude and azimuth angles caused significant diurnal changes in radiant return both visible near-IR regions spectrum several vegetation indices derived from them. The magnitude these related canopy architecture, percent cover, green leaf area conditions. measurements taken each time period well correlated with index but nature relationship changed significantly day. Thus bias estimation (GLAI) remotely sensed spectral data could occur if are not properly accounted for.
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