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Colac - Victoria, Australia

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• National Aeronautics and Space Administration (NASA) - The Thematic Mapper
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Location of Colac, Victoria
© Geoscience Australia

The city of Colac is located in southwestern Victoria on the edge of Lake Colac, approximately 40km from the Victorian coastline. These images were acquired from the Landsat 5 Thematic Mapper sensor. True and false colour images for both a recent (2009), and an older (1988) scene are available below in high resolution JPEG format.

For acquisition of full resolution files see the Earth Observation Catalogue, or contact earth.observation@ga.gov.au

• Colac false colour before and after
• 1988 Colac true colour
• 2009 Colac true colour
• 1988 Colac false colour
• 2009 Colac false colour

In this false colour swipe comparison, the extent of the urban areas of Colac are highlighted in red. Residential expansion has been dominantly southward into Elliminyt with a combination of both urban and rural-residential housing. New industry and commercial buildings have appeared in Colac East, and similarly just out of the city in the area of Colac West. Also notice the changing water level of Lake Colac, which is significantly lower during the 2009 image due to the prolonged drought. Lake Purdiguluc, in the top left of the image, appears to be completely dried up.

	1988 Colac true colour Landsat 5 TM satellite image Red, green, and blue hues are representing TM band’s 3 (visible red), 2 (visible green) and 1 (visible blue) respectively Image taken on 14 December 1988 25m Resolution Download high resolution image [JPEG 307KB] © Geoscience Australia
	2009 Colac true colour Landsat 5 TM satellite image Red, green, and blue hues are representing TM band’s 3 (visible red), 2 (visible green) and 1 (visible blue) respectively Image taken on 7 November 2009 25m Resolution Download high resolution image [JPEG 345KB] © Geoscience Australia
	1988 Colac false colour Landsat 5 TM satellite image Red, green, and blue hues are representing TM band’s 1 (visible blue), 5 (mid-infrared) and 4 (near infrared) respectively Image taken on 14 December 1988 25m Resolution In these false colour images, urban areas appear as shades of red. Vegetation appears in a range of blue to green, with blue representing more irrigated vegetation. Darker shades of blue or green represent forests or plantations, with lighter shades showing grasslands or agriculture. Water bodies appear dark red to black. Download high resolution image [JPEG 326KB] © Geoscience Australia
	2009 Colac false colour Landsat 5 TM satellite image Red, green, and blue hues are representing TM band’s 1 (visible blue), 5 (mid-infrared) and 4 (near infrared) respectively Image taken on 7 November 2009 25m Resolution Download high resolution image [JPEG 346KB] © Geoscience Australia

Topic contact: earth.observation@ga.gov.au Last updated: October 27, 2011