Selection of suitable digital elevation model for analysis of forest cover in different agro-climatic zones of Jharkhand, India

S. N. Mishra, Dharmendra Kumar, Sharad Tiwari
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引用次数: 3

Abstract

Digital Elevation Model (DEM) has wide ranging application in the study and analysis of various environmental and biodiversity conservation issues. Due to geographical variations, the accuracy of DEMs generated from different satellite sources needs to be ascertained for choosing the best suitable DEM for a particular study area. In the present study, the performance of DEM datasets of Cartosat-1 and Shuttle Radar Topography Mission (SRTM) has been evaluated on the basis of slope, aspect, altitude and hill-shade map generated through these DEMs for different agro-climatic zones of Jharkhand. Elevation values deduced through Cartosat-1 and SRTM datasets were compared with actual Ground Control Points (GCP) recorded using Global Positioning System (GPS) for testing their accuracy. The forest cover map was created by Landsat 7 ETM+ data and subsequently superimposed on altitude map, generated using SRTM and Cartosat-1. Further, it was visually compared with the Survey of India topo-sheet (1:50000) for analyzing undulating topography and forest cover of Jharkhand. The comparative study based on different parameters for DEM dataset from Cartosat-1 and SRTM, reveals that SRTM data performed better than Cartosat-1 for the study of forest cover in different agro-climatic zones of Jharkhand.
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印度贾坎德邦不同农业气候带森林覆盖分析的数字高程模型选择
数字高程模型(DEM)在各种环境和生物多样性保护问题的研究和分析中有着广泛的应用。由于地理差异,需要确定不同卫星源生成的DEM的精度,以便为特定研究区域选择最适合的DEM。本文利用Cartosat-1和Shuttle Radar terrain Mission (SRTM) DEM数据集对贾坎德邦不同农业气候带的坡度、坡向、海拔和山阴图进行了评价。通过Cartosat-1和SRTM数据集推断的高程值与使用全球定位系统(GPS)记录的实际地面控制点(GCP)进行了比较,以测试其精度。森林覆盖图由Landsat 7 ETM+数据生成,然后叠加在SRTM和Cartosat-1生成的高程图上。此外,将其与Survey of India topo-sheet(1:50000)进行视觉比较,以分析贾坎德邦的起伏地形和森林覆盖。基于不同参数对Cartosat-1和SRTM DEM数据的对比研究表明,SRTM数据对贾坎德邦不同农业气气带森林覆盖的研究效果优于Cartosat-1。
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