GEODATA TOPO 2.5M 2003 (GA)

The GEODATA TOPO 2.5M 2003 product is a national seamless data product aimed at regional or national applications. It is a vector representation of the Australian landscape as represented on the Geoscience Australia 1:2.5M general reference maps and is suitable for GIS applications.\n\nIt supersedes the TOPO 2.5M 1998 product by being developed according to GEODATA standards as described below. The data was derived from GEODATA TOPO 250K Series 2 data where available and GEODATA TOPO 250K Series 1 and has double precision accuracy.\n\nThe product consists of eleven data layers, including built-up areas, contours, drainage, framework, localities, offshore, rail transport, road transport, sand ridges, spot heights, and waterbodies.

GEODATA TOPO 2.5M 2003数据集是一款面向区域或国家级应用的全国无缝数据产品。该数据集以澳大利亚地球科学局（Geoscience Australia）出版的1:250万通用参考地图为基准，对澳大利亚地貌进行矢量表达，适用于地理信息系统（GIS）应用场景。

本数据集依据下述GEODATA标准开发，替代了原有的TOPO 2.5M 1998数据集。其数据优先源自GEODATA TOPO 250K系列2数据，在该数据不可获取的情况下则采用GEODATA TOPO 250K系列1数据，整体精度达到双精度水平。

该数据集共包含11个数据图层，分别为建成区、等高线、水系、地理框架、居民地、近海要素、铁路交通、公路交通、沙脊、高程点以及水体。