Spectral invariance hypothesis study of polarized reflectance with Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI)

Christine L. Bradley, Meridith Kathryn Kupinski, David J. Diner, Feng Xu, Russell A Chipman

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

11 Citations (Scopus)

Abstract

Many models used to represent the boundary condition for the separation of atmospheric scattering from the surface reflectance in polarized remote sensing measurements assume that the polarized surface reflectance is spectrally neutral. The Spectral Invariance Hypothesis asserts that the magnitude and shape of the polarized bidirectional reflectance factor (pBRF) is equal for all wavelengths. In order to test this hypothesis, JPL's Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI) is used to measure polarization information of different outdoor surface types. GroundMSPI measures the linear polarization Stokes parameters (I, Q, U), at three wavelengths, 470 nm, 660 nm, and 865 nm. The camera is mounted on a two-Axis gimbal to accurately select the view azimuth and elevation directions. On clear sky days we acquired day-long scans of scenes that contain various surface types such as grass, dirt, cement, brick, and asphalt and placed a Spectralon panel in the camera field of view to provide a reflectance reference. Over the course of each day, changing solar position in the sky provides a large range of scattering angles for this study. The polarized bidirectional reflectance factor (pBRF) is measured for the three wavelengths and the best fit slope of the spectral correlation is reported. This work reports the range of best fit slopes measured for five region types.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9613
ISBN (Print)9781628417791
DOIs
StatePublished - 2015
EventPolarization Science and Remote Sensing VII - San Diego, United States
Duration: Aug 11 2015Aug 12 2015

Other

OtherPolarization Science and Remote Sensing VII
CountryUnited States
CitySan Diego
Period8/11/158/12/15

Fingerprint

Imager
Invariance
Reflectance
Image sensors
invariance
reflectance
bidirectional reflectance
asphalt
sky
Wavelength
solar position
cameras
atmospheric scattering
wavelengths
dirt
slopes
spectral correlation
Slope
gimbals
Polarization

Keywords

  • land surface reectance
  • Multiangle Spec-TroPolarimetric Imager (MSPI)
  • pBRDF
  • pBRF
  • spectral invariance
  • spectrally neutral

ASJC Scopus subject areas

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

Cite this

Bradley, C. L., Kupinski, M. K., Diner, D. J., Xu, F., & Chipman, R. A. (2015). Spectral invariance hypothesis study of polarized reflectance with Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI). In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9613). [96130U] SPIE. https://doi.org/10.1117/12.2187495

Spectral invariance hypothesis study of polarized reflectance with Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI). / Bradley, Christine L.; Kupinski, Meridith Kathryn; Diner, David J.; Xu, Feng; Chipman, Russell A.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9613 SPIE, 2015. 96130U.

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

Bradley, CL, Kupinski, MK, Diner, DJ, Xu, F & Chipman, RA 2015, Spectral invariance hypothesis study of polarized reflectance with Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI). in Proceedings of SPIE - The International Society for Optical Engineering. vol. 9613, 96130U, SPIE, Polarization Science and Remote Sensing VII, San Diego, United States, 8/11/15. https://doi.org/10.1117/12.2187495
Bradley CL, Kupinski MK, Diner DJ, Xu F, Chipman RA. Spectral invariance hypothesis study of polarized reflectance with Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI). In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9613. SPIE. 2015. 96130U https://doi.org/10.1117/12.2187495
Bradley, Christine L. ; Kupinski, Meridith Kathryn ; Diner, David J. ; Xu, Feng ; Chipman, Russell A. / Spectral invariance hypothesis study of polarized reflectance with Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI). Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9613 SPIE, 2015.
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