Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation Approach
Monitoring surface albedo at medium-to-fine resolution (<100 m) has become increasingly important for medium-to-fine scale applications and coarse-resolution data evaluation. This paper presents a method for estimating surface albedo directly using top-of-atmosphere reflectance. This is the...
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doaj-7eddd95420bf4c8d8c96997c8939dd0a2020-11-24T21:06:44ZengMDPI AGRemote Sensing2072-42922015-05-01755495551010.3390/rs70505495rs70505495Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation ApproachTao He0Shunlin Liang1Dongdong Wang2Xiaona Chen3Dan-Xia Song4Bo Jiang5Department of Geographical Sciences, University of Maryland, College Park, MD 20742, USADepartment of Geographical Sciences, University of Maryland, College Park, MD 20742, USADepartment of Geographical Sciences, University of Maryland, College Park, MD 20742, USADepartment of Geographical Sciences, University of Maryland, College Park, MD 20742, USADepartment of Geographical Sciences, University of Maryland, College Park, MD 20742, USAState Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, ChinaMonitoring surface albedo at medium-to-fine resolution (<100 m) has become increasingly important for medium-to-fine scale applications and coarse-resolution data evaluation. This paper presents a method for estimating surface albedo directly using top-of-atmosphere reflectance. This is the first attempt to derive surface albedo for both snow-free and snow-covered conditions from medium-resolution data with a single approach. We applied this method to the multispectral data from the wide-swath Chinese HuanJing (HJ) satellites at a spatial resolution of 30 m to demonstrate the feasibility of this data for surface albedo monitoring over rapidly changing surfaces. Validation against ground measurements shows that the method is capable of accurately estimating surface albedo over both snow-free and snow-covered surfaces with an overall root mean square error (RMSE) of 0.030 and r-square (R2) of 0.947. The comparison between HJ albedo estimates and the Moderate Resolution Imaging Spectral Radiometer (MODIS) albedo product suggests that the HJ data and proposed algorithm can generate robust albedo estimates over various land cover types with an RMSE of 0.011–0.014. The accuracy of HJ albedo estimation improves with the increase in view zenith angles, which further demonstrates the unique advantage of wide-swath satellite data in albedo estimation.http://www.mdpi.com/2072-4292/7/5/5495surface albedodirect estimationmedium resolutionsnow albedoHJ data |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tao He Shunlin Liang Dongdong Wang Xiaona Chen Dan-Xia Song Bo Jiang |
spellingShingle |
Tao He Shunlin Liang Dongdong Wang Xiaona Chen Dan-Xia Song Bo Jiang Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation Approach Remote Sensing surface albedo direct estimation medium resolution snow albedo HJ data |
author_facet |
Tao He Shunlin Liang Dongdong Wang Xiaona Chen Dan-Xia Song Bo Jiang |
author_sort |
Tao He |
title |
Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation Approach |
title_short |
Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation Approach |
title_full |
Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation Approach |
title_fullStr |
Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation Approach |
title_full_unstemmed |
Land Surface Albedo Estimation from Chinese HJ Satellite Data Based on the Direct Estimation Approach |
title_sort |
land surface albedo estimation from chinese hj satellite data based on the direct estimation approach |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2015-05-01 |
description |
Monitoring surface albedo at medium-to-fine resolution (<100 m) has become increasingly important for medium-to-fine scale applications and coarse-resolution data evaluation. This paper presents a method for estimating surface albedo directly using top-of-atmosphere reflectance. This is the first attempt to derive surface albedo for both snow-free and snow-covered conditions from medium-resolution data with a single approach. We applied this method to the multispectral data from the wide-swath Chinese HuanJing (HJ) satellites at a spatial resolution of 30 m to demonstrate the feasibility of this data for surface albedo monitoring over rapidly changing surfaces. Validation against ground measurements shows that the method is capable of accurately estimating surface albedo over both snow-free and snow-covered surfaces with an overall root mean square error (RMSE) of 0.030 and r-square (R2) of 0.947. The comparison between HJ albedo estimates and the Moderate Resolution Imaging Spectral Radiometer (MODIS) albedo product suggests that the HJ data and proposed algorithm can generate robust albedo estimates over various land cover types with an RMSE of 0.011–0.014. The accuracy of HJ albedo estimation improves with the increase in view zenith angles, which further demonstrates the unique advantage of wide-swath satellite data in albedo estimation. |
topic |
surface albedo direct estimation medium resolution snow albedo HJ data |
url |
http://www.mdpi.com/2072-4292/7/5/5495 |
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