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

Mark 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

Fingerprint

bidirectional reflectance
spectral reflectance
photosynthetically active radiation
Distribution functions
Advanced very high resolution radiometers (AVHRR)
Satellites
zenith angle
sensor
Radiation
AVHRR
Sensors
Orbits
modeling
Blueprints
nadir
Infrared imaging
Radiometers
Sun
land surface
Earth (planet)

Cite this

Chopping, M., 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.
Chopping, Mark ; Rango, Albert ; Gomez-Landesa, Enrique. / The importance of early morning local overpass times of BRDF retrieval, modeling of spectral reflectance and fAPAR estimation. Paper presented at 2002 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2002), Toronto, Ont., Canada.3 p.
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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.",
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Chopping, M, Rango, A & Gomez-Landesa, E 2002, 'The importance of early morning local overpass times of BRDF retrieval, modeling of spectral reflectance and fAPAR estimation' Paper presented at 2002 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2002), Toronto, Ont., Canada, 24/06/02 - 28/06/02, pp. 2264-2266.

The importance of early morning local overpass times of BRDF retrieval, modeling of spectral reflectance and fAPAR estimation. / Chopping, Mark; Rango, Albert; Gomez-Landesa, Enrique.

2002. 2264-2266 Paper presented at 2002 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2002), Toronto, Ont., Canada.

Research output: Contribution to conferencePaper

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AU - Rango, Albert

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N2 - 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.

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