Forward a spatio-temporal trend surface for long-term ground-measured albedo upscaling over heterogeneous land surface

作者:Wu, XD (Wu, Xiaodan)[ 1,2 ] ; Wen, JG (Wen, Jianguang)[ 1,3 ] ; Xiao, Q (Xiao, Qing)[ 1 ] ; You, DQ (You, Dongqin)[ 1 ] ; Liu, Q (Liu, Qiang)[ 4 ] ; Lin, XW (Lin, Xingwen)[ 1,2 ]

INTERNATIONAL JOURNAL OF DIGITAL EARTH

卷: 11  期: 5  页: 470-484

DOI: 10.1080/17538947.2017.1334097

出版年: 2018

文献类型:Article

摘要

Upscaling ground albedo is challenged by the serious discrepancy between the heterogeneity of land surfaces and the small number of ground-based measurements. Conventional ground-based measurements cannot provide sufficient information on the characteristics of surface albedo at the scale of coarse pixels over heterogeneous land surfaces. One method of overcoming this problem is to introduce high-resolution albedo imagery as ancillary information for upscaling. However, due to the low frequency of updating of high-resolution albedo maps, upscaling time series of ground-based albedo measurements is difficult. This paper proposes a method that is based on the idea of conceptual universal scaling methodology for establishing a spatiotemporal trend surface using very few high-resolution images and time series of ground-based measurements for spatial-temporal upscaling of albedo. The construction of the spatiotemporal trend surface incorporates the spatial information provided by auxiliary remote sensing images and the temporal information provided by long time series of ground observations. This approach was illustrated by upscaling ground-based fine-scale albedo measurements to a coarse scale over the core study area in HiWATER. The results indicate that this method can characterize the spatiotemporal variations in surface albedo well, and the overall correlation coefficient was 0.702 during the study period.

通讯作者地址: Wen, JG (通讯作者)

Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, 20A Datun Rd, Beijing, Peoples R China.

通讯作者地址: Wen, JG (通讯作者)

Joint Ctr Global Change Studies, Beijing 100875, Peoples R China.

地址:

[ 1 ] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, 20A Datun Rd, Beijing, Peoples R China

[ 2 ] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China

[ 3 ] Joint Ctr Global Change Studies, Beijing 100875, Peoples R China

[ 4 ] Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing, Peoples R China