Evaluation of DEM, and orthoimage generated from Cartosat-1 with its potential for feature extraction and visualization
Evaluation of DEM, and orthoimage generated from Cartosat-1 with its potential for feature extraction and visualization
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评估 DEM 和 Cartosat-1 生成的正射影像及其特征提取和可视化潜力
DOI：
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发表时间：
2013
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通讯作者：
A. Bhardwaj
中科院分区：
文献类型：
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作者：
A. Bhardwaj
利用Cartosat-1卫星立体（PAN）数据提供的有理多项式系数（RPC），对Cartosat-1数据生成的三角网、数字高程模型（DEM）和正射影像的精度进行了评价。研究区域为拉贾斯坦邦的斋浦尔市。对2005年5月18日在斋浦尔上空获得的数据进行了分析。立体对包括平原地区，农田，城市地区，水体和Aravalli山脉的地形。进行了差分全球定位系统测量，以收集地面控制点，用于卫星三角测量、数字高程模型生成、正射影像生成和随后的精度评估分析。通过DGPS测量，测量了18个GCP。12个地面控制点用于三角测量，6个地面控制点用作检查点。卫星三角测量的总体RMSE为0.753像素。在X和Y方向上分别实现了2.08 m和1.74 m的水平精度。通过在高度变化的地形中使用独立的检查点，还单独评估了3.72 m的垂直精度。
The present study evaluates the accuracy of Triangulation, Digital Elevation Model (DEM) and orthoimage generated by Cartosat-1 data by using Rational Polynomial Coefficient’s (RPC’s) provided with the Cartosat-1 satellite stereo (PAN) data. The study area is taken as Jaipur city, Rajasthan. The data acquired over Jaipur, on 18 May’ 2005 was analysed. The stereopair comprises of terrain ranging from plain area, agriculture fields, urban area, waterbody and Aravalli hill range. A Differential Global Positioning System (DGPS) survey was conducted to collect ground control points (GCPs) for satellite triangulation, DEM generation, orthoimage generation and subsequent analysis for accuracy assessment. Eighteen GCPs were measured through DGPS survey. Twelve GCPs are used for triangulation and six GCPs were used as check points. The overall RMSE for satellite triangulation is 0.753 pixel. Horizontal accuracy of 2.08 m and 1.74 m is achieved in X and Y direction, respectively. The vertical accuracy of 3.72 m has been assessed separately also by using independent check point in highly varying terrain.