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TitleComparison of in situ LAI retrieval of two instruments of four mature agricultural crops
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorWhite, H PORCID logo; Young, E R
SourceGeomatics Canada, Technical Note 1, 2007, 9 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf
Subjectsremote sensing; satellite imagery; satellites; vegetation; field methods; photography; Agriculture
Illustrationsphotographs; graphs
Released2007 08 01
AbstractIn contribution to the land-surface parameter-validation efforts of the Working Group on Calibration and Validation (WGCV) under the Committee on Earth Observation Satellites (CEOS), the Canada Centre for Remote Sensing - Natural Resources Canada participated in a multinational field exercise led by the CEOS Land Product Validation (LPV) subgroup. The purpose of this exercise was to compare existing and commonly used field instruments and methodologies for determining effective leaf-area index (Le) for the purpose of integrating field Le information to satellite-based Earth Observation (EO) imagery to provide geospatialmaps of Le over a large area. An investigation of integrating these field measurements to satellite imagery will be the focus of a separate report.

This study included (but was not limited to) comparisons between using hemispheric upward and downward photography and using the LICOR LAI-2000 and related methodology as tools for determining Le during an agricultural field campaign. Where possible, measurements were obtained subject to both direct (near local solar noon) and diffuse (just after sunrise or just before sunset) illumination. Crop types evaluated included corn, sorghum, soybean, and alfalfa, all mature. All sites were located at the Manfredi Instituto Nacional de Tecnología Agropecuaria (INTA) station in the Cordoba province, Argentina. The field exercise was carried out in early March, 2005.

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