Radiative transfer in shrub savanna sites in Niger: preliminary results from HAPEX-Sahel. 1. Modelling surface reflectance using a geometric-optical approach

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dc.contributor.author Franklin, Janet en_US
dc.contributor.author Duncan, Jeff en_US
dc.contributor.author Huete, Alfredo en_US
dc.contributor.author Van Leeuwen, J en_US
dc.contributor.author Li, Xiaowen en_US
dc.contributor.author Begue, Agnes en_US
dc.contributor.editor en_US
dc.date.accessioned 2011-02-07T06:21:34Z
dc.date.available 2011-02-07T06:21:34Z
dc.date.issued 1994 en_US
dc.identifier 2009001550 en_US
dc.identifier.citation Franklin Janet et al. 1994, 'Radiative transfer in shrub savanna sites in Niger: preliminary results from HAPEX-Sahel. 1. Modelling surface reflectance using a geometric-optical approach', Elsevier Inc, vol. 69, no. 3-4, pp. 223-245. en_US
dc.identifier.issn 0168-1923 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/13422
dc.description.abstract To use optical remote sensing to monitor land surface-climate interactions over large areas, algorithms must be developed to relate multispectral measurements to key variables controlling the exchange of matter (water, carbon dioxide) and energy between the land surface and the atmosphere. The proportion of the ground covered by vegetation and the interception of photosynthetically active radiation (PAR) by vegetation are examples of two variables related to evapotranspiration and primary production, respectively. An areal-proportion model of the multispectral reflectance of shrub savanna, composed of scattered shrubs with a grass, forb or soil understory, predicted the reflectance of two 0.5 km2 sites as the area-weighted average of the shrub and understory or `background? reflectances. Although the shaded crown and shaded background have darker reflectances, ignoring them in the area-weighted model is not serious when shrub cover is low and solar zenith angle is small. A submodel predicted the reflectance of the shrub crown as a function of the foliage reflectance and amount of plant material within the crown, and the background reflectance scattered or transmitted through canopy gaps (referred to as a soil?plant `spectral interaction? term). One may be able to combine these two models to estimate both the fraction of vegetation cover and interception of PAR by green vegetation in a shrub savanna. en_US
dc.language en_US
dc.publisher Elsevier Inc en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/0168-1923(94)90027-2 en_US
dc.title Radiative transfer in shrub savanna sites in Niger: preliminary results from HAPEX-Sahel. 1. Modelling surface reflectance using a geometric-optical approach en_US
dc.parent Agricultural and Forest Meteorology en_US
dc.journal.volume 69 en_US
dc.journal.number 3-4 en_US
dc.publocation Netherlands en_US
dc.identifier.startpage 223 en_US
dc.identifier.endpage 245 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 070500 en_US
dc.personcode 0000059082 en_US
dc.personcode 0000059083 en_US
dc.personcode 108636 en_US
dc.personcode 0000058783 en_US
dc.personcode 0000059084 en_US
dc.personcode 0000059085 en_US
dc.percentage 100 en_US
dc.classification.name Forestry Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords en_US


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