Optical sensor package for multiangle measurements of surface reflectance

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


The Remote Sensing Group of the Optical Sciences Center at the University of Arizona has performed the vicarious calibration of satellite sensors since the 1980s. Ground-based measurements of atmospheric and surface properties, including the surface bidirectional reflectance distribution function (BRDF), are conducted during a satellite or airborne sensor overpass and the at-sensor radiance is calculated using these properties as input to a radiative transfer code. Recently, the Remote Sensing Group has investigated an imaging radiometer based on an astronomical-grade 1024 × 1024-pixel silicon CCD array that was developed and calibrated for ground-based measurements of BRDF. The results of that study have been used to examine the feasibility of a lightweight instrument package for measurements of surface BRDF based on a combination of nonimaging radiometers and inexpensive digital cameras. The current work presents a preliminary design of such a system including specifications for ground-based operations of the system to characterize the BRDF of test sites used by the Remote Sensing Group. Also included is a preliminary evaluation of a Nikon 990 digital camera coupled with a 1.7-mm focal length fisheye lens to determine the level of accuracy that can be obtained in surface BRDF.

Original languageEnglish (US)
Pages (from-to)326-333
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2002
EventImaging Spectrometry VII - San Diego, CA, United States
Duration: Aug 1 2001Aug 3 2001


  • BRDF
  • Calibration
  • Digital camera
  • Multiangle
  • Reflectance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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