Satellite Imagery

Document No:  D12#434471
Revision:  2A
Date amended:  14-May-2015
The information below is intended to reflect the preferred practice of Main Roads Western Australia ("Main Roads"). Main Roads reserves the right to update this information at any time without notice. If you have any questions or comments please contact Nathan Miller by e-mail or on phone (08) 9323-4669.

To the extent permitted by law, Main Roads, its employees, agents, authors and contributors are not liable for any loss resulting from any action taken or reliance made by you on the information herein displayed.


Revision Register

Ed/Version Number Clause Number Description of Revision Date
ISSUE ​2 ​Header ​Document Number Changed ​16/06/2014
​ISSUE 2A​Header​Guideline introduction amended.​14/05/2015

Table of Content


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;

  • One-Meter or smaller resolution images from Ikonos and Quickbird.  These images are on par with aerial photographs at high altitudes.  They allow features larger than a meter to be identified such as footpaths bus shelters, road lanes and cars to be identified.
  • 10-Meter resolution images Spot imagery used to cover larger tracts of land around Coral Bay.
  • 20-Meter images from Landsat 7 satellites used to identify flooded areas general soil types to identify road building materials.

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). 

To discuss applications and costings of satellite data please contact the Senior Mapping Surveyor.