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.
Highlights
Land Use/Land Cover (LULC) maps as necessary inputs for distributed eco-hydrological models are very essential for ecohydrological process modeling, and LULC mapping with remotely sensed data by means of different classification algorithms has become a popular approach
The results suggested that the topographic effects were tremendously reduced with these two algorithms under the support of different spatial resolution digital elevation model (DEM), and the performance of the topographic correction with the 1:50,000topographic-map DEM was similar to that achieved using Shuttle Radar Topography Mission (SRTM) DEM
In this paper how the DEM resolution affects the performance of topographic correction and LULC
Summary
LULC maps as necessary inputs for distributed eco-hydrological models are very essential for ecohydrological process modeling, and LULC mapping with remotely sensed data by means of different classification algorithms has become a popular approach. Various correction algorithms using digital elevation model (DEM) have been proposed to account for this problem as a preliminary step to the digital classification of LULC for specific sensors. Among these algorithms, cosine correction [5], C correction [5], b correction [6], two-stage normalization [7], SCS correction [3], SCS+C correction [8], Minnaert correction [9] and so on are world-wide utilized techniques. Reeder [10] pointed out that the improvements in the availability of high-resolution DEM throughout the United States and globally suggested that the topographic correction methods would be gained widespread use in the remote sensing community
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