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The NPL Gonio RAdiometric Spectrometer System (GRASS)

The NPL Gonio RAdiometric Spectrometer System (GRASS)
The NPL Gonio RAdiometric Spectrometer System (GRASS)
Increasingly satellites have the capability and requirement to measure surfaces at multiple angles, and additionally, due to the variations in slope angle and aspect, few remotely sensed data sets are immune to multi-angular effects. Since such measurements need to be calibrated or at least validated against real ground data we need to improve the accuracy of multi-angular field measurements. A new instrument has been designed, in conjunction with the Natural Environmental Research Council (UK) Field Spectroscopy Facility (FSF) and the University of Southampton for this purpose. The GonioRAdiometric Spectrometer System (GRASS) has been developed at the National Physical Laboratory, which provides quasi-simultaneous, multi-angle, multi-spectral measurements of Earth surface reflected sunlight to support vicarious calibration of satellite sensors operating in the optical region. The instrument will ultimately be available for use by UK researchers through the FSF to provide data to develop a better understanding of the anisotropy of natural targets, which can be used to reduce errors in climate modelling. It will also be utilised for the characterisation of “reference standard” test sites.
goniometer, vicarious calibration, validation
1-3
Remote Sensing & Photogrammetry Society
Pegrum-Browning, H.
131f0732-f218-42d6-bff0-20882e7595a4
Fox, N.
7635c426-459d-4ff4-99ab-d4b0ef42c7e6
Milton, E.
f6cb5c0d-a5d4-47d7-860f-096de08e0c24
Pegrum-Browning, H.
131f0732-f218-42d6-bff0-20882e7595a4
Fox, N.
7635c426-459d-4ff4-99ab-d4b0ef42c7e6
Milton, E.
f6cb5c0d-a5d4-47d7-860f-096de08e0c24

Pegrum-Browning, H., Fox, N. and Milton, E. (2008) The NPL Gonio RAdiometric Spectrometer System (GRASS). In Proceedings of the Remote Sensing and Photogrammetry Society Conference: “Measuring change in the Earth system”. University of Exeter, 15-17 September 2008. Remote Sensing & Photogrammetry Society. pp. 1-3 .

Record type: Conference or Workshop Item (Paper)

Abstract

Increasingly satellites have the capability and requirement to measure surfaces at multiple angles, and additionally, due to the variations in slope angle and aspect, few remotely sensed data sets are immune to multi-angular effects. Since such measurements need to be calibrated or at least validated against real ground data we need to improve the accuracy of multi-angular field measurements. A new instrument has been designed, in conjunction with the Natural Environmental Research Council (UK) Field Spectroscopy Facility (FSF) and the University of Southampton for this purpose. The GonioRAdiometric Spectrometer System (GRASS) has been developed at the National Physical Laboratory, which provides quasi-simultaneous, multi-angle, multi-spectral measurements of Earth surface reflected sunlight to support vicarious calibration of satellite sensors operating in the optical region. The instrument will ultimately be available for use by UK researchers through the FSF to provide data to develop a better understanding of the anisotropy of natural targets, which can be used to reduce errors in climate modelling. It will also be utilised for the characterisation of “reference standard” test sites.

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More information

Published date: 15 September 2008
Venue - Dates: Remote Sensing and Photogrammetry Society Conference: “Measuring Change in the Earth System”, Exeter, United Kingdom, 2008-09-14 - 2008-09-16
Keywords: goniometer, vicarious calibration, validation

Identifiers

Local EPrints ID: 63464
URI: http://eprints.soton.ac.uk/id/eprint/63464
PURE UUID: e605cdcc-f2d6-40c9-90fe-71aafb0aeeaf

Catalogue record

Date deposited: 09 Oct 2008
Last modified: 27 Jul 2020 16:40

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Contributors

Author: H. Pegrum-Browning
Author: N. Fox
Author: E. Milton

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