NDLI: Design and Testing a New Instrument to Measure the Angular Reflectance of Terrestrial Surfaces

Content Provider	IEEE Xplore Digital Library
Author	Pegrum, H. Fox, N. Chapman, M. Milton, E.
Copyright Year	2006
Description	Author affiliation: Opt. Radiat. Meas. Group, Nat. Phys. Lab., London (Pegrum, H.; Fox, N.; Chapman, M.)
Abstract	Satellite sensors can measure the solar energy reflected from the Earth's atmosphere and surface, and provide the only feasible method of obtaining global scale data on the state of the planet. The accuracy and reliability of data from satellite sensors is therefore of vital importance, and much effort goes into characterizing such instruments before launch. However, the stress of launch, and the extreme environment of space is known to affect the calibration of sensors, introducing uncertainty into the data they provide, especially the long time-series data necessary to investigate and monitor climate change. It is therefore vitally important that methods for the post-launch calibration and validation of data from satellite sensors are developed and tested. In order to do this it is necessary to have highly accurate data on the angular reflectance of natural surfaces, and this project aims to develop and test a new instrument to achieve this. To improve the accuracy of field measurements, a new instrument is being designed, in conjunction with the Natural Environmental Research Council Field Spectroscopy Facility (NERC FSF). The Gonio RAdiometric Spectrometer System (GRASS) is being developed at the National Physical Laboratory (NPL), in its Optical Radiation Measurement Team. It is intended to provide quasi-simultaneous, multi-angle, multi- spectral measurements of Earth surface reflected sunlight to support vicarious calibration of satellite sensors operating in the optical region and the validation of their products. The instrument is required to be easily and quickly assembled in remote situations, be robust and transportable to remote locations and its measurements fully traceable to SI units. The GRASS instrument is currently being assembled at the NPL and will be deployed in summer 2006 as part of an experiment to validate data from a range of airborne and satellite sensors. The paper will review existing methods of measuring BRDF in the field, highlight the improvements that GRASS will provide to users, and describe the experiments performed to test its performance.
Starting Page	1119
Ending Page	1122
File Size	287353
Page Count	4
File Format	PDF
ISBN	0780395107
DOI	10.1109/IGARSS.2006.289
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-07-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Testing Instruments Reflectivity Extraterrestrial measurements Satellite broadcasting Sensor phenomena and characterization Calibration Optical sensors Atmospheric measurements Spectroscopy
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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