National Topographic data – principally referred to in this document as Geodata Topo 250K Series 3 – is a nationally consistent representation of natural and built environment features on the earth's surface for Australia excluding external territories. The data is thematically ordered and includes the following datasets containing up to 92 different feature classes:
The national dynamic land cover dataset is aggregated from many different sources to give a coverage over all of Australia.
The dataset is a nationally consistent and thematically comprehensive land cover reference for Australia. It provides an 8 year synoptic overview of land cover at 250 metre resolution for the Australian continent between April 2000 and April 2008.
Positioning technology through Global Navigation Satellite Systems (GNSS) has revolutionised our ability to access positioning information at the touch of a button. From smartphones to autonomous vehicles, positioning delivers value to users through increased productivity, safety and innovation. The National Positioning Infrastructure (NPI) Capability led by Geoscience Australia maximises this value to the nation by enabling exceptional accuracy and reliability from a new generation of positioning systems.
Landsat represents the world's longest continuously acquired collection of space-based moderate-resolution land remote sensing data.
Four decades of imagery provides a unique resource for those who work in agriculture, geology, forestry, regional planning, education, mapping, and global change research.
Satellite Characteristics:
Airports and airfields are defined by the International Civil Aviation Organisation as defined points or areas on land or water intended to be used either wholly or in part for the arrival, departure and surface movement of aircraft. ICAO uses the term aerodromes. Airports are generally facilities that have commercial passenger and cargo facilities.
The national catchment boundaries dataset in an aggregation of all the catchment boundaries into a single coverage for all of Australia.
The National Hydrographic obstructions dataset is a aggregated dataset fo different inputs to provide a national coverage of Australia.
Hydrological obstructions are man-made features that impact the water network either by obstruction, diversion or storage of water.
The National Flow Direction Grid is the national coverage of flow direction for all of Australia.
The Flow Direction Grid is a regular grid of surface flow directions accompanying the GEODATA 9 Second Digital Elevation Model (DEM) Version 3. It ascribes to each DEM point one of eight cardinal directions (E, SE, S, SW, W, NW, N, NE) denoting the direction of surface flow from each grid point to one of its eight immediate neighbours.
Location, height and description of infrastructure, markers or other devices on land which may aid travellers in determining their position or safe course.
Railways are transportation systems using one or more rails to carry freight or passengers. Railway stations are recognised stopping places where goods, vehicles or passengers may be transferred from one form of transport to the rail network, and vice versa. Railway stations can also include what are now called “intermodal transfer stations”.
