NSW Foundation Spatial Data Framework - Elevation and Depth Theme Profile

Elevation and Depth is the measurement of the Earth’s surface above or below a vertical datum to obtain the height of the land.\r\nData is collected using a range of sensors including: laser, sonar, radar and optical.\r\nTechnical methodologies are used to derive spot heights, raster surfaces, contours, triangulated irregular networks and digital elevation models.

高程与深度（Elevation and Depth）测量是为获取陆地高程，对地球表面相对于垂直基准面（vertical datum）的上下位置进行的定量测量工作。
该数据集通过激光、声呐、雷达及光学等多种传感器采集数据。
依托专业技术方法，可导出测点高程（spot heights）、栅格表面（raster surfaces）、等高线（contours）、不规则三角网（Triangulated Irregular Network，TIN）以及数字高程模型（Digital Elevation Model，DEM）。