The importance of early morning local overpass times of BRDF retrieval, modeling of spectral reflectance and fAPAR estimation

Mark J. Chopping, Albert Rango, Enrique Gomez-Landesa

Research output: Contribution to conferencePaper

Abstract

Blueprints for near-future moderate resolution satellite-borne sensor systems such as the VIIRS (Visible Infrared Imaging Radiometer Suite) sensor on the National Polar-orbiting Operational Environmental Satellite System (NPOESS) do not include plans to ensure that land surface observations are made from an early morning (AM) orbit (07:30-08:30 local time) as well as in the afternoon (PM), and current spaceborne sensors designed to sample the bidirectional reflectance distribution function (BRDF) achieve this by off-nadir viewing with a small range of solar zenith angles (SZA). This many limit the utility of current and future systems in important Earth observation applications such as estimating the fraction of absorbed photosynthetically-active radiation (fAPAR). The lack of observations at 50° < SZA < 70° may only be partly offset by the 09:30 orbit foreseen for EUMETSAT's METOP satellite, to carry a third generation Advanced Very High Resolution Radiometer (AVHRR). Here existing AVHRR data are used to examine the likely impact of inverting models with observations at a small range of sun angles.

Original languageEnglish
Pages2264-2266
Number of pages3
StatePublished - 1 Jan 2002
Event2002 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2002) - Toronto, Ont., Canada
Duration: 24 Jun 200228 Jun 2002

Other

Other2002 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2002)
CountryCanada
CityToronto, Ont.
Period24/06/0228/06/02

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    Chopping, M. J., Rango, A., & Gomez-Landesa, E. (2002). The importance of early morning local overpass times of BRDF retrieval, modeling of spectral reflectance and fAPAR estimation. 2264-2266. Paper presented at 2002 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2002), Toronto, Ont., Canada.