Sensors 2009, 9(3), 1980-1995; doi:10.3390/s90301980
Article

LULC Classification and Topographic Correction of Landsat-7 ETM+ Imagery in the Yangjia River Watershed: the Influence of DEM Resolution

1 International Institute for Earth System Science (ESSI), Nanjing University. Nanjing 210093, P.R. China 2 Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, CAS, Beijing 100029, P.R. China
* Author to whom correspondence should be addressed.
Received: 19 December 2008; in revised form: 17 February 2009 / Accepted: 9 March 2009 / Published: 17 March 2009
(This article belongs to the Section Remote Sensors)
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Abstract: DEM-based topographic corrections on Landsat-7 ETM+ imagery from rugged terrain, as an effective processing techniques to improve the accuracy of Land Use/Land Cover (LULC) classification as well as land surface parameter retrievals with remotely sensed data, has been frequently reported in the literature. However, few studies have investigated the exact effects of DEM with different resolutions on the correction of imagery.Taking the topographic corrections on the Landsat-7 ETM+ images acquired from the rugged terrain of the Yangjiahe river basin (P.R. China) as an example, the present work systematically investigates such issues by means of two commonly used topographic correction algorithms with the support of different spatial resolution DEMs. After the pre-processing procedures, i.e. atmospheric correction and geo-registration, were applied to the ETM+ images, two topographic correction algorithms, namely SCS correction and Minnaert correction, were applied to assess the effects of different spatial resolution DEMs obtained from two sources in the removal of topographic effects and LULC classifications. The results suggested that the topographic effects were tremendously reduced with these two algorithms under the support of different spatial resolution DEMs, and the performance of the topographic correction with the 1:50,000-topographic-map DEM was similar to that achieved using SRTM DEM. Moreover, when the same topographic correction algorithm was applied the accuracy of LULC classification after topographic correction based on 1:50,000-topographic-map DEM was similar as that based on SRTM DEM, which implies that the 90 m SRTM DEM can be used as an alternative for the topographic correction of ETM+ imagery when high resolution DEM is unavailable.
Keywords: Land Use/ Land Cover (LULC); SCS Correction; Minnaert correction; DEM; Landsat-7 ETM+

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MDPI and ACS Style

Gao, Y.; Zhang, W. LULC Classification and Topographic Correction of Landsat-7 ETM+ Imagery in the Yangjia River Watershed: the Influence of DEM Resolution. Sensors 2009, 9, 1980-1995.

AMA Style

Gao Y, Zhang W. LULC Classification and Topographic Correction of Landsat-7 ETM+ Imagery in the Yangjia River Watershed: the Influence of DEM Resolution. Sensors. 2009; 9(3):1980-1995.

Chicago/Turabian Style

Gao, Yongnian; Zhang, Wanchang. 2009. "LULC Classification and Topographic Correction of Landsat-7 ETM+ Imagery in the Yangjia River Watershed: the Influence of DEM Resolution." Sensors 9, no. 3: 1980-1995.

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