Validation of a laser-based system for ground measurement of backscatter surface reflectance

John Buchanan, Jeremy Dobler, Kurtis Thome, Stuart F Biggar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The recent deployment of on-orbit active sensors operating at optical wavelengths requires new calibration methods to be investigated. In response to this, a ground-based active radiometer for measuring backscattered surface reflectance has been developed by the Remote Sensing Group at the University of Arizona. This instrument, known as the reflectometer, was designed to match the illumination and detection geometry of spaceborne lidar systems. The reflectometer uses a Nd:YAG laser operating at 1064 nm (with the capability of 532 nm), illuminates the target sample at normal incidence by use of a beam expander and fold mirror, then collects the reflected light at nadir through an aperture in the fold mirror. In order to reduce stray light, a 3 nm bandwidth filter centered on the laser wavelength is mounted in front of the silicon detector and a half cylinder shell encloses the optical system. Previous measurements at White Sands Missile Range, NM have produced results that are within 3% of coincident measurements using a field spectrometer. The results of these measurements are presented, including further laboratory testing using tarpaulin witness samples and future improvements of the original system design. In addition, comparison of reflectometer measurements to MODIS derived reflectance as it relates to on-orbit lidar retroreflection will be discussed. The benefits of validating MODIS derived reflectance will become essential with the launch of CALIPSO and its incorporation into the A-train.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6296
DOIs
StatePublished - 2006
EventEarth Observing Systems XI - San Diego, CA, United States
Duration: Aug 14 2006Aug 16 2006

Other

OtherEarth Observing Systems XI
CountryUnited States
CitySan Diego, CA
Period8/14/068/16/06

Fingerprint

Reflectometers
reflectometers
reflectance
Lasers
Optical radar
MODIS (radiometry)
lasers
Mirrors
Orbits
optical radar
Stray light
Wavelength
Silicon detectors
retroreflection
missile ranges
CALIPSO (Pathfinder satellite)
mirrors
orbits
Radiometers
Missiles

Keywords

  • Backscatter
  • Calibration
  • CALIPSO
  • Reflectance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Buchanan, J., Dobler, J., Thome, K., & Biggar, S. F. (2006). Validation of a laser-based system for ground measurement of backscatter surface reflectance. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6296). [629613] https://doi.org/10.1117/12.681310

Validation of a laser-based system for ground measurement of backscatter surface reflectance. / Buchanan, John; Dobler, Jeremy; Thome, Kurtis; Biggar, Stuart F.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6296 2006. 629613.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Buchanan, J, Dobler, J, Thome, K & Biggar, SF 2006, Validation of a laser-based system for ground measurement of backscatter surface reflectance. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6296, 629613, Earth Observing Systems XI, San Diego, CA, United States, 8/14/06. https://doi.org/10.1117/12.681310
Buchanan J, Dobler J, Thome K, Biggar SF. Validation of a laser-based system for ground measurement of backscatter surface reflectance. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6296. 2006. 629613 https://doi.org/10.1117/12.681310
Buchanan, John ; Dobler, Jeremy ; Thome, Kurtis ; Biggar, Stuart F. / Validation of a laser-based system for ground measurement of backscatter surface reflectance. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6296 2006.
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