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

Remote Sensing

Ming-Liang Gao¹  Wen-Ji Zhao¹  Zhao-Ning Gong¹  Hui-Li Gong¹  Zheng Chen¹ 

[1] Key Laboratory of 3D Information Acquisition and Application of Ministry of Education, Beijing 100048, China; E-Mails:

关键词: topographical correction;    non-lambertian reflection models;    ZY-3 satellite;    biomass;    remote sensing estimation;   

DOI  :  10.3390/rs6042745

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland