Exploration of a Polarized Surface Bidirectional Reflectance Model Using the Ground-Based Multiangle Spectropolarimetric Imager

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dc.contributor.utaustinauthorDavis, Aben_US
dc.creatorDiner, Diner J.en_US
dc.creatorXu, Fengen_US
dc.creatorMartonchik, John V.en_US
dc.creatorRheingans, Brian E.en_US
dc.creatorGeier, Svenen_US
dc.creatorJovanovic, Veljko M.en_US
dc.creatorDavis, Aben_US
dc.creatorChipman, Russell A.en_US
dc.creatorMcClain, Stephen C.en_US
dc.date.accessioned2016-10-28T19:51:42Z
dc.date.available2016-10-28T19:51:42Z
dc.date.issued2012-12en_US
dc.description.abstractAccurate characterization of surface reflection is essential for retrieval of aerosols using downward-looking remote sensors. In this paper, observations from the Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI) are used to evaluate a surface polarized bidirectional reflectance distribution function (PBRDF) model. GroundMSPI is an eight-band spectropolarimetric camera mounted on a rotating gimbal to acquire pushbroom imagery of outdoor landscapes. The camera uses a very accurate photoelastic-modulator-based polarimetric imaging technique to acquire Stokes vector measurements in three of the instrument's bands (470, 660, and 865 nm). A description of the instrument is presented, and observations of selected targets within a scene acquired on 6 January 2010 are analyzed. Data collected during the course of the day as the Sun moved across the sky provided a range of illumination geometries that facilitated evaluation of the surface model, which is comprised of a volumetric reflection term represented by the modified Rahman-Pinty-Verstraete function plus a specular reflection term generated by a randomly oriented array of Fresnel-reflecting microfacets. While the model is fairly successful in predicting the polarized reflection from two grass targets in the scene, it does a poorer job for two manmade targets (a parking lot and a truck roof), possibly due to their greater degree of geometric organization. Several empirical adjustments to the model are explored and lead to improved fits to the data. For all targets, the data support the notion of spectral invariance in the angular shape of the unpolarized and polarized surface reflection. As noted by others, this behavior provides valuable constraints on the aerosol retrieval problem, and highlights the importance of multiangle observations.en_US
dc.description.departmentCenter for Space Researchen_US
dc.description.sponsorshipNASAen_US
dc.description.sponsorshipJPLen_US
dc.identifierdoi:10.15781/T2JS9HB21
dc.identifier.citationDiner, David J., Feng Xu, John V. Martonchik, Brian E. Rheingans, Sven Geier, Veljko M. Jovanovic, Ab Davis, Russell A. Chipman, and Stephen C. McClain. "Exploration of a polarized surface bidirectional reflectance model using the ground-based multiangle spectropolarimetric imager." Atmosphere, Vol. 3, No. 4 (Dec., 2012): 591-619.en_US
dc.identifier.doi10.3390/atmos3040591en_US
dc.identifier.issn2073-4433en_US
dc.identifier.urihttp://hdl.handle.net/2152/43257
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAtmosphereen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectaerosolsen_US
dc.subjectremote sensingen_US
dc.subjectpolarizationen_US
dc.subjectunderlying surface reflectanceen_US
dc.subjectaerosol propertiesen_US
dc.subjectphotopolarimetric measurementsen_US
dc.subjectinstrumenten_US
dc.subjectdescriptionen_US
dc.subjectland surfacesen_US
dc.subjectangleen_US
dc.subjectretrievalen_US
dc.subjectairborneen_US
dc.subjectderivationen_US
dc.subjectmisren_US
dc.subjectmeteorology & atmospheric sciencesen_US
dc.titleExploration of a Polarized Surface Bidirectional Reflectance Model Using the Ground-Based Multiangle Spectropolarimetric Imageren_US
dc.typeArticleen_US

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