ARC elevation - PED

## **Abstract** \n\nThis dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.\n\nDigital Terrain Model derived from radar elevations from NASA's SRTM (Shuttle Radar Topography Mission) project in Feb 2000. Raster resolution is 1 arc seconds of latitude/longitude which is equivalent to approximately 30 metres. It consists of a regular grid representing ground surface topography, and where possible, excluding other features such as vegetation and man-made structures.\n\n## **Purpose** \n\nVarious\n\n## **Dataset History** \n\nThe SRTM data was collected during a 10 day NASA Space Shuttle mission in February 2000 (Kobrick, 2006). It was processed to produce a 1 arc second digital surface model covering most of the earth's landmass and publicly released as a 3 second resolution product. The 1 second version was provided to CSIRO by Australia's Defence Imagery and Geospatial Organisation (DIGO) with permission to release cleaned up products to government users only. The data was acquired by interferometric synthetic aperture radar, meaning that the information is contained in the interference patterns between the radar signals collected by two antennas, one of which was inside the Shuttle and the other was on a 60m boom. The Shuttle was oriented to point the antennas at 45 degrees to the ground to optimise the effect of topography on the interference patterns, but this also has the effect of obscuring any steep areas facing away from the Shuttle. This is mostly overcome by collecting overlapping swathes from different orbits, although some canyons and steep areas have no data. Other areas that did not produce a good radar return signal also have no data.Comparison of SRTM with reference data (Rodriguez et al, 2006) showed that 90% of tested heights were within 6m of the reference heights. In much of the clear flat areas of Australia the height errors are less than 3m, although there are some areas where the errors are much larger. Trees and buildings produce offsets in the elevation much larger than these height errors, since the radar frequency used by SRTM does not penetrate them.\n\n## **Dataset Citation** \n\nSA Department of Environment, Water and Natural Resources (2015) ARC elevation - PED. Bioregional Assessment Source Dataset. Viewed 12 October 2016, http://data.bioregionalassessments.gov.au/dataset/ac790bcf-7809-4ba1-b3ce-0faa8637c5e1.

**摘要**
本数据集及其元数据声明由第三方提交至生物区域评估计划（Bioregional Assessment Programme），本文档按原始提交形式呈现。
本数据集为数字地形模型，源自美国国家航空航天局（NASA）2000年2月实施的SRTM（航天飞机雷达地形测绘任务，Shuttle Radar Topography Mission）项目的雷达高程数据。栅格分辨率为1弧秒经纬度，约合30米。数据集由代表地表地形的规则网格构成，尽可能剔除植被、人工构筑物等非地表地形要素。

**用途**
用途多样。

**数据集历史**
SRTM数据采集于2000年2月为期10天的NASA航天飞机任务中（Kobrick，2006）。经处理后生成覆盖全球绝大多数陆地的1弧秒数字地表模型，并以3弧秒分辨率产品的形式公开发布。1弧秒版本由澳大利亚国防图像与地理空间组织（Defence Imagery and Geospatial Organisation, DIGO）提供给联邦科学与工业研究组织（Commonwealth Scientific and Industrial Research Organisation, CSIRO），且仅允许向政府用户发布经过清理的衍生产品。
该数据通过干涉合成孔径雷达采集：两个天线分别搭载于航天飞机内部及60米长的吊杆上，采集的雷达信号之间的干涉图样包含了地形信息。航天飞机的天线朝向与地面成45度角，以最大化地形对干涉图样的影响，但这也会导致背向航天飞机的陡峭区域无法被有效探测。尽管部分峡谷及陡峭区域存在数据缺失，但通过不同轨道采集的重叠扫描带可在很大程度上弥补这一缺陷。未获得良好雷达回波信号的区域同样存在数据缺失。
经与参考数据对比（Rodriguez等，2006），90%的测试高程点与参考高程的差值在6米以内。在澳大利亚多数开阔平坦区域，高程误差小于3米，但部分区域的误差幅度显著更大。由于SRTM采用的雷达频率无法穿透植被与建筑物，此类地物会导致高程偏移量远大于上述高程误差。

**数据集引用**
南澳大利亚州环境、水与自然资源部（2015）ARC高程——PED。生物区域评估源数据集。2016年10月12日查阅，http://data.bioregionalassessments.gov.au/dataset/ac790bcf-7809-4ba1-b3ce-0faa8637c5e1。