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Details van artikel 199 van 268 gevonden artikelen
| Titel: |
Reflection of layered bean leaves over different soil backgrounds: measured and simulated spectra |
| Auteur: |
Miller, J. R. Steven, M. D. Demetriades-Shah, T. H. |
| Verschenen in: |
International journal of remote sensing |
| Paginering: | Jaargang 13 (1992) nr. 17 pagina's 3273-3286 |
| Jaar: |
1992-11-01 |
| Inhoud: |
A GER IRIS field spectrometer has been employed in a laboratory setting to measure the spectral reflectance of multiple layers (1, 2, 3, and 4) of French bean leaves overlayed on three soil backgrounds (peat, sand and loam), each in either a dry or wet (watered to field capacity) condition. Spectral reflectance data for the dry sand and dry peat backgrounds and for both sides of the single bean leaf, over these two backgrounds, were used with a simple model to derive the basic leaf optical properties: the diffuse transmittance and front and back reflectance spectra. These basic leaf optical spectra were then used to simulate the effect of leaf layering over the six background soils at 100 nm intervals between 450 nm and 2450 nm. Reflectance differences over the entire spectrum between the simulated and measured spectra were consistently less than 3 per cent for the six background soils used, with leaf to leaf variability thought to play the major role in the observed variability. These results suggest that representative leaf and soil background reflectance data collected with field-type spectrometers can be used to model spectral trends expected in typical field crops over a wide range of spectral backgrounds and percentage cover. For example, such data for a particular agricultural setting may be used to explore suitable spectral indicates to minimize the dependence of dcrived-LAI on soil background as well as obtain the leaf diffuse spectral reflectance and transmission functions for the crop of interest, which are the link to physical properties such as pigment concentration and leaf moisture content. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 199 van 268 gevonden artikelen
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