GSWA South Yilgarn merged and levelled, elevation line data

The Digital Elevation Model represents ground surface topography between points of known elevation. The elevation data was calculated using the altimeters and Global Positioning System (GPS) sensor used for the benefit of airborne magnetic and radiometric data on the same survey. The elevation is the height relative to the Australian Height Datum GDA94 (AUSGEOID09). The processed elevation data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. These line dataset from the South Yilgarn merge, 1987-2005 survey were acquired in 1987 by the WA Government, and consisted of 392575 line-kilometres of data at a line spacing between 100m and 400m, and 60m terrain clearance.

数字高程模型（Digital Elevation Model, DEM）用于表征已知高程点之间的地表地形起伏。本次航磁与放射性航测同步作业所使用的高度计及全球定位系统（GPS）传感器，被用于计算该高程数据。该高程为相对于澳大利亚高程基准面GDA94（AUSGEOID09）的海拔高度。经处理的高程数据已由GA地球物理学家开展质量核验，以确保GA发布的最终数据适配实际应用需求。本次1987-2005年南耶尔加恩合并区航测项目的航线数据集，于1987年由西澳大利亚州政府采集完成，总数据量达392575航线公里，航线间距介于100米至400米之间，作业飞行时距地表高度为60米。