Investigation of Atmospheric Effects on Retrieval of Sun-Induced Fluorescence Using Hyperspectral Imagery

作者:Ni, ZY (Ni, Zhuoya)[ 1,2 ] ; Liu, ZG (Liu, Zhigang)[ 1 ] ; Li, ZL (Li, Zhao-Liang)[ 2,3 ] ; Nerry, F (Nerry, Francoise)[ 2 ] ; Huo, HY (Huo, Hongyuan)[ 4 ] ; Sun, R (Sun, Rui)[ 1 ] ; Yang, PQ (Yang, Peiqi)[ 5 ] ; Zhang, WW (Zhang, Weiwei)[ 1 ]

SENSORS

卷: 16  期: 4

文献号: 480

DOI: 10.3390/s16040480

出版年: APR 2016

摘要

Significant research progress has recently been made in estimating fluorescence in the oxygen absorption bands, however, quantitative retrieval of fluorescence data is still affected by factors such as atmospheric effects. In this paper, top-of-atmosphere (TOA) radiance is generated by the MODTRAN 4 and SCOPE models. Based on simulated data, sensitivity analysis is conducted to assess the sensitivities of four indicators-depth_absorption_band, depth_nofs-depth_withfs, radiance and Fs/radiance-to atmospheric parameters (sun zenith angle (SZA), sensor height, elevation, visibility (VIS) and water content) in the oxygen absorption bands. The results indicate that the SZA and sensor height are the most sensitive parameters and that variations in these two parameters result in large variations calculated as the variation value/the base value in the oxygen absorption depth in the O-2-A and O-2-B bands (111.4% and 77.1% in the O-2-A band; and 27.5% and 32.6% in the O-2-B band, respectively). A comparison of fluorescence retrieval using three methods (Damm method, Braun method and DOAS) and SCOPE Fs indicates that the Damm method yields good results and that atmospheric correction can improve the accuracy of fluorescence retrieval. Damm method is the improved 3FLD method but considering atmospheric effects. Finally, hyperspectral airborne images combined with other parameters (SZA, VIS and water content) are exploited to estimate fluorescence using the Damm method and 3FLD method. The retrieval fluorescence is compared with the field measured fluorescence, yielding good results (R-2 = 0.91 for Damm vs. SCOPE SIF; R-2 = 0.65 for 3FLD vs. SCOPE SIF). Five types of vegetation, including ailanthus, elm, mountain peach, willow and Chinese ash, exhibit consistent associations between the retrieved fluorescence and field measured fluorescence.

通讯作者地址: Liu, ZG (通讯作者)

Beijing Normal Univ, Beijing Key Lab Environm Remote Sensing & Digital, State Key Lab Remote Sensing Sci, Sch Geog, Beijing 100875, Peoples R China.

地址:

[ 1 ] Beijing Normal Univ, Beijing Key Lab Environm Remote Sensing & Digital, State Key Lab Remote Sensing Sci, Sch Geog, Beijing 100875, Peoples R China

[ 2 ] Univ Strasbourg, CNRS, ICube, CS10413, 300 Blvd Sebastien Brant, F-67412 Illkirch Graffenstaden, France

[ 3 ] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr, Key Lab Agriinformat, Beijing 100081, Peoples R China

[ 4 ] Tianjin Normal Univ, Coll Urban & Environm Sci, Tianjin 300387, Peoples R China

[ 5 ] Univ Twente, ITC Fac Geoinformat Sci & Earth Observat, NL-7514AE Enschede, Netherlands