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Journal of Geo-information Science >

2014 , Vol. 16 >Issue 1: 134 - 141

DOI: https://doi.org/10.3724/SP.J.1047.2014.00134

ARTICLES

Analysis and Comparison Test on C-correction Strategies and Their Scale Effects with TM Images in Rugged Mountainous Terrain

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  • Institute of International Rivers and Eco-Security, Yunnan University, Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security, Kunming 650091, China

Received date: 2013-03-19

  Revised date: 2013-08-04

  Online published: 2014-01-05

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Abstract

Topographic correction for remotely sensed images is an important preprocessing step to remove the topographic effects in rugged mountainous terrain. In this study, different C-correction strategies (determining the empirical c-parameter for different NDVI intervals, different land use types, and different slope intervals) and scale levels are used to eliminate the effects of topography on Landsat TM images in complex mountains terrain. Performance of the three strategies was tested by visual comparison, correlation analysis between corrected images and the solar illumination angle (cosi), and image classification accuracy. It is attempted to find a C-correction strategy more suitable for mountainous area. The test site selected for this study is Nanting River basin, which is a subbasin of the Nujiang-Salween River. Visual comparisons showed that all the three strategies of C-correction can substantially eliminate negative terrain effects. All the C-correction strategies, similar to the global C-correction, resulted in over-correction phenomenon to different degree. The landuse-specific C-correction performs best on band 1, band 2, band 3 and band 7, the global C correction performs best on the band 4, while the slope-specific C-correction performs best on band 5. To achieve the best effect, different bands can be considered to take different strategies. Although these C-correction strategies can remove negative terrain effects, classification accuracy of Landsat TM images was not improved in our pilot area. Topography obviously affects remote sensing images with high spatial resolution, however, the effects of terrain on remote sensing images with low spatial resolution cannot be ignored.

Key words： topographic correction; scale effects; C-correction; rugged mountainous terrain; correction strategies

Cite this article

LI Cuicui, FAN Jicang, FU Xiaohua, FAN Hui . Analysis and Comparison Test on C-correction Strategies and Their Scale Effects with TM Images in Rugged Mountainous Terrain[J]. Journal of Geo-information Science, 2014 , 16(1) : 134 -141 . DOI: 10.3724/SP.J.1047.2014.00134

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