DOI: 10.5194/tc-11-1575-2017
Scopus记录号: 2-s2.0-85021739940
论文题名: Unmanned aerial system nadir reflectance and MODIS nadir BRDF-adjusted surface reflectances intercompared over Greenland
作者: Faulkner Burkhart J ; , Kylling A ; , Schaaf C ; B ; , Wang Z ; , Bogren W ; , Storvold R ; , Solbø S ; , Pedersen C ; A ; , Gerland S
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 4 起始页码: 1575
结束页码: 1589
语种: 英语
英文关键词: aerial survey
; albedo
; bidirectional reflectance
; MODIS
; nadir
; spectral resolution
; surface reflectance
; unmanned vehicle
; Arctic
; Greenland
; Summit
英文摘要: Albedo is a fundamental parameter in earth sciences, and many analyses utilize the Moderate Resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF)/albedo (MCD43) algorithms. While derivative albedo products have been evaluated over Greenland, we present a novel, direct comparison with nadir surface reflectance collected from an unmanned aerial system (UAS). The UAS was flown from Summit, Greenland, on 210 km transects coincident with the MODIS sensor overpass on board the Aqua and Terra satellites on 5 and 6 August 2010. Clear-sky acquisitions were available from the overpasses within 2 h of the UAS flights. The UAS was equipped with upward- A nd downward-looking spectrometers (300-920 nm) with a spectral resolution of 10 nm, allowing for direct integration into the MODIS bands 1, 3, and 4. The data provide a unique opportunity to directly compare UAS nadir reflectance with the MODIS nadir BRDF-adjusted surface reflectance (NBAR) products. The data show UAS measurements are slightly higher than the MODIS NBARs for all bands but agree within their stated uncertainties. Differences in variability are observed as expected due to different footprints of the platforms. The UAS data demonstrate potentially large sub-pixel variability of MODIS reflectance products and the potential to explore this variability using the UAS as a platform. It is also found that, even at the low elevations flown typically by a UAS, reflectance measurements may be influenced by haze if present at and/or below the flight altitude of the UAS. This impact could explain some differences between data from the two platforms and should be considered in any use of airborne platforms. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75533
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geosciences, University of Oslo, Oslo, Norway; University of California, Merced, CA, United States; Norwegian Institute for Air Research, Kjeller, Norway; School for the Environment, University of Massachusetts Boston, Boston, MA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; U.S.Geological Survey, Flagstaff, AZ, United States; Norut-Northern Research Institute, Tromsø, Norway; Norwegian Polar Institute, Fram Centre, Tromsø, Norway
Recommended Citation:
Faulkner Burkhart J,, Kylling A,, Schaaf C,et al. Unmanned aerial system nadir reflectance and MODIS nadir BRDF-adjusted surface reflectances intercompared over Greenland[J]. Cryosphere,2017-01-01,11(4)