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Evaluating the quality of the Digital Elevation Models produced from ASTER stereoscopy for topographic mapping in the Brazilian Amazon Region

机译:评估从ASTER立体镜产生的数字高程模型的质量,以用于巴西亚马逊地区的地形图

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摘要

Brazilian Amazon is a vast territory rich in natural renewable and non-renewable resources. Due to the adverse environmental condition (rain, cloud, dense vegetation) and difficult access, topographic information is still poor, and when available needs to be up-dated or re-mapped. In this paper, the feasibility of using elevation generated from orbital ASTER stereo-pairs images for topographic mapping was investigated for the mountainous relief in the Serra dos Carajás, Pará. The quality of information derived from these optical images was evaluated regarding field altimetric measurements. Precise topographic field information acquired from Global Positioning System (GPS) was used as Ground Control Points (GCPs) for the modeling of the stereoscopic Digital Elevation Models (DEMs) and as Independent Check Points (ICPs) for the calculation of elevation accuracies. The analysis was performed following two approaches: (1) the use of Root Mean Square Error (RMSE) and (2) calculations of trend analysis and accuracy. The investigation has shown that the altimetric accuracy from ASTER fulfilled the Brazilian Map Accuracy Standards elevation requirements for 1:100,000 A Class. In addition, ASTER can provide up-dated planimetric information that is also necessary for cartographic production. Thus, when the environment condition allows the acquisition of stereo-pairs, the use of ASTER can be considered an alternative for semi-detailed topographic mapping in similar environments of the Brazilian Amazon.
机译:巴西亚马逊河是一片广阔的土地,拥有丰富的自然可再生和不可再生资源。由于不利的环境条件(雨,云,茂密的植被)和难以获取的地形信息仍然很差,并且在可用时需要更新或重新映射。在本文中,针对在帕拉州Serra dosCarajás的山区地形,研究了使用从轨道ASTER立体对图像生成的高程进行地形图绘制的可行性。从这些光学图像得出的信息的质量是根据现场测高评估的。从全球定位系统(GPS)获得的精确地形信息被用作地面控制点(GCP),用于建模立体数字高程模型(DEM),并用作独立检查点(ICP),用于计算高程精度。该分析是通过以下两种方法进行的:(1)使用均方根误差(RMSE)和(2)趋势分析和准确性的计算。调查显示,ASTER的高度精确度满足了巴西地图精确度标准对1:100,000 A级的海拔要求。此外,ASTER还可以提供地图制图所必需的最新平面信息。因此,当环境条件允许获取立体声对时,可以考虑使用ASTER作为巴西亚马逊类似环境中半详细地形图的替代方法。

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