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Remote Sens. 2014, 6(4), 2745-2764; doi:10.3390/rs6042745
Article

Topographic Correction of ZY-3 Satellite Images and Its Effects on Estimation of Shrub Leaf Biomass in Mountainous Areas

1,2,3,* , 1,2,3,* , 1,2,3
, 1,2,3
, 1,2,3
 and 4
1 Key Laboratory of 3D Information Acquisition and Application of Ministry of Education, Beijing 100048, China 2 Key Laboratory of Resources Environment and GIS of Beijing Municipal, Beijing 100048, China 3 College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China 4 Satellite Surveying and Mapping Application Center, NASG, Beijing 101300, China
* Authors to whom correspondence should be addressed.
Received: 27 November 2013 / Revised: 10 March 2014 / Accepted: 13 March 2014 / Published: 26 March 2014
(This article belongs to the Special Issue Satellite Mapping Technology and Application)
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Abstract

The availability of ZY-3 satellite data provides additional potential for surveying, mapping, and quantitative studies. Topographic correction, which eliminates the terrain effect caused by the topographic relief, is one of the fundamental steps in data preprocessing for quantitative analysis of vegetation. In this paper, we rectified ZY-3 satellite data using five commonly used topographic correction models and investigate their impact on the regression estimation of shrub forest leaf biomass obtained from sample plots in the study area. All the corrections were assessed by means of: (1) visual inspection (2) reduction of the standard deviation (SD) at different terrain slopes (3) correlation analysis of different correction results. Best results were obtained from the Minnaert+SCS correction, based on the non-Lambertian reflection assumption. Additional analysis showed that the coefficient correlation of the biomass fitting result was improved after the Minnaert+SCS correction, as well as the fitting precision. The R2 has increased by 0.113 to reach 0.869, while the SD (standard deviation) of the biomass dropped by 21.2%. Therefore, based on the facts, we conclude that in the region with large topographic relief, the topographical correction is essential to the estimation of the biomass.
Keywords: topographical correction; non-lambertian reflection models; ZY-3 satellite; biomass; remote sensing estimation topographical correction; non-lambertian reflection models; ZY-3 satellite; biomass; remote sensing estimation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Gao, M.-L.; Zhao, W.-J.; Gong, Z.-N.; Gong, H.-L.; Chen, Z.; Tang, X.-M. Topographic Correction of ZY-3 Satellite Images and Its Effects on Estimation of Shrub Leaf Biomass in Mountainous Areas. Remote Sens. 2014, 6, 2745-2764.

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