Measuring and tracking changes
Since the 1980s, Landgate has been at the forefront of capturing and using satellite imagery.
Used to measure and track natural and human induced changes across the Earth, satellite imagery can produce images of large or small parts of the world from a small section of city streets to an entire continent.
Satellites capture information that is not visible to the human eye and most carry more than one sensor on board to capture images in low to high resolution.
At Landgate we have our own satellite receiving station so we can capture imagery from certain satellites in near real time. We also have agreements in place to allow access to commercial satellite data, and we use this in websites we manage for a range of fire monitoring and agricultural applications.
Spatial resolution refers to the level of detail that can be retrieved from an image. As one of the key parameters in satellite imagery, resolution is the size of one pixel on the ground and is measured as the distance between the centre points of each adjacent pixel.
The spatial resolution of satellite imagery differs depending on the satellite and the sensors it has on board. Spatial resolution can be categorised as:
- Low resolution: 60m - 2km per pixel
- Medium resolution: 10 - 30m per pixel
- High to very high resolution: 30cm - 5m per pixel
At Landgate’s satellite receiving station we receive data from satellites that have a spatial resolution from 250m to 1km. (Not all have sensors with all the resolutions listed above on them.)
Satellites we receive date from, include:
- JPSS-1 (also known as NOAA-20)
Access to satellite imagery
Access will depend on the spatial resolution of the imagery that you are seeking:
Applications for satellite imagery
Landgate manages several websites that predominantly use satellite imagery. The sites fall into two categories as below:
Satellite imagery costs
Lower resolution imagery
Raw imagery from the lower resolution satellites such as Terra, Aqua, SNPP and JPSS-1 is available from Landgate for the cost of extraction and provision. Value-added products are charged on a case-by-case basis, and costs depend on the amount of coverage and number of bands of information you require.
Please email any requests to EarthObs@landgate.wa.gov.au.
High to very high-resolution imagery
Landgate can procure high to very high-resolution imagery via the Capture WA program. This program is only available to WA public sector agencies and Local Governments. It allows access to satellites such as (but not limited to):
- SPOT (1.5m spatial resolution)
- WorldView-2 (as low as 46cm spatial resolution for panchromatic imagery)
- Worldview-3 (as low as 30cm minimum spatial resolution for panchromatic imagery).
Public sector agencies can visit Capture WA to register and submit requests for a range of satellite and aerial imagery.