Location: Southwest Watershed Research CenterTitle: Evaluation of the VIIRS BRDF, Albedo and NBAR products suite and an assessment of continuity with the long term MODIS record Author
|Liu, Y. - University Of Massachusetts|
|Wang, Z. - Goddard Space Flight Center|
|Sun, Q. - University Of Massachusetts|
|Erb, A. - University Of Massachusetts|
|Schaaf, C. - University Of Massachusetts|
|Zhang, X. - South Dakota State University|
|Roman, M.o. - Goddard Space Flight Center|
|Scott, Russell - Russ|
|Zhang, Q. - University Of Indiana|
|Novick, K.a. - University Of Indiana|
|Bret-harte, M. - University Of Alaska|
|Petroy, S. - Battelle Memorial Institute|
|Sanclements, M. - Battelle Memorial Institute|
Submitted to: Remote Sensing of Environment
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/8/2017
Publication Date: 9/25/2017
Citation: Liu, Y., Wang, Z., Sun, Q., Erb, A., Schaaf, C., Zhang, X., Roman, M., Scott, R.L., Zhang, Q., Novick, K., Bret-Harte, M., Petroy, S., Sanclements, M. 2017. Evaluation of the VIIRS BRDF, Albedo and NBAR products suite and an assessment of continuity with the long term MODIS record. Remote Sensing of Environment. 201:256-274. https://doi.org/10.1016/j.rse.2017.09.020.
DOI: https://doi.org/10.1016/j.rse.2017.09.020 Interpretive Summary: The amount of solar energy that is reflected by the Earth’s surface, called albedo, is an essential climate variable to accurately model the global surface energy budget. To estimate albedo from remotely sensed observations from satellites, the intrinsic variability in the reflective character of the surface is needed. Here we compared two different satellite’s measurements of reflective character of the land surface and the algorithms that translate these reflectances into albedo. We find that the measurements from the newer satellite agree well with the older satellite and with surface observations. Thus, the goal of the new satellite, to provide a continuing, high-quality data record into the future to better understand our changing planet, is well supported.
Technical Abstract: Bidirectional Reflectance Distribution Function (BRDF) model parameters, Albedo quantities, and Nadir BRDF Adjusted Reflectance (NBAR) products derived from the Visible Infrared Imaging Radiometer Suite (VIIRS), on the Suomi-NPP (National Polar-orbiting Partnership) satellite are evaluated through comparison with the MODerate Resolution Imaging Spectroradiometer (MODIS) long term record and with spatially representative in situ tower albedometer measurements. Preliminary White Sky Albedo (WSA), Black Sky Albedo (BSA), NBAR, and Quality Assurance (QA) results show that the VIIRS algorithm is performing well at the global scale and provides global data products comparable with MODIS (with an absolute bias of 0.0069 for shortwave broadband WSA) despite the spectral, angular, and effective spatial resolution differences between the two sensors. Both VIIRS and MODIS albedo are shown to agree well with in situ albedo measurements at a number of spatially representative sites. This evaluation provides confidence that the high quality, daily VIIRS BRDF model parameters, Albedo, and NBAR products will be able to provide the long term continuity required by the modeling and monitoring communities.