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Satellite data is a cost effective method of capturing information over large areas. Remotely sensed satellite data is an extremely powerful tool that can be viewed as imagery or used to analyse geographic information.
Satellite imagery is collected from sensors that detect very specific wavelengths (bands) of electromagnetic radiation reflected from the earths surface. Depending on the satellite, the bands measured can fall within the visible, infrared, thermal and radar portions of the spectrums. These bands can be used in different combinations to detect and highlight specific information.
Some examples where Main Roads has applied satellite imagery data are:
investigating large flooded areas finding resources ie road building material providing overview images for presentations and reports.
Some other applications that satellite imagery can be used for is to create DEM's (Digital Elevation Models) determine vegetation health / classifications or to assist with monitoring burnt areas.
There is a growing number of commercial satellites available that offer a range of different resolutions and spectral detection.
Some examples of Satellite imagery used by Main Roads are;
A small selection of satellite images can be found within the image library. Alternatively satellite images can be sourced from Department of Land Administration (DOLA - Floreat).