|
ACRES Related links |
Updated:
20 June 2008
LANDSAT SatellitesDiagram of the Landsat 7 Satellite ACRES receives and processes data from the Landsat series of satellites. The first Landsat satellite was launched in July 1972. Of the sensors carried, the Multispectral Scanner (MSS) with 80-metre pixels and four spectral bands was found to provide information of unforeseen value. In July 1982, the launch of Landsat 4 saw the inclusion of the Thematic Mapper (TM) sensor with a 30-metre resolution and 7 spectral bands. Both sensors are on Landsat 5. The newest in this series of remote sensing satellites is Landsat 7. Launched on 15 April 1999, Landsat 7 has the new Enhanced Thematic Mapper Plus (ETM+) sensor. This sensor has the same 7 spectral bands as its predecessor, TM, but has an added panchromatic band with 15-metre resolution and a higher resolution thermal band of 60 metres. The ETM+ sensor also has a five percent absolute radiometric calibration. Historical InformationLandsat MSS data has been recorded over Australia since 1972, with ACRES commencing acquisition in October 1979. Acquisition of Landsat MSS image data ceased in November 1997. From late 1979 ACRES has archived nearly every pass over Australia and continues to receive and archive data from Landsat 5 and Landsat 7 generally on a daily basis.
Enhanced Thematic Mapper Plus (ETM+) and Thematic Mapper (TM)ACRES started acquiring ETM+ image data from the Landsat 7 satellite in July 1999. With ETM+ image data acquired daily, the ACRES archive is the largest repository of Landsat 7 images covering Australia. A fault with the Landsat 7 Scan Line Corrector (SLC) occurred on 31 May 2003 resulting in small gaps in the processed products. For more details refer to: Overseas data can also be accessed by ACRES via our agreement with USGS. Example of a Landsat Thematic Mapper image Example of a Landsat 7 image The Landsat Thematic Mapper (TM) is a sensor onboard the Landsat 4 and Landsat 5 spacecrafts. It provides information on the Earth's surface in the visible, near, middle and thermal infrared regions of the electromagnetic spectrum. Thematic Mapper data of Australia, Papua New Guinea and South-Eastern Indonesia has been acquired in Australia by ACRES continuously since September 1987 until 31 December 1999. Acquisitions of Landsat 5 TM data recommenced on 1 July 2003. Radiometric Characteristics of the ETM+ and TM Sensors
Other Satellite and Image Characteristics
Multispectral Scanner (MSS)Example of a Landsat Multispectral Scanner image The Landsat Multispectral Scanner (MSS) has been on board all the Landsat spacecraft from the beginning of the Landsat program in 1972. This sensor provides information on the earth's surface in the visible and near infrared parts of the spectrum. ACRES acquired Landsat MSS image data from 14 September 1979 to 30 November 1997. Image data required for earlier dates can be obtained from archives held by the USGS, EROS Data Center. Radiometric Characteristics
Other Characteristics
Enquiries and orders for Landsat dataTo enquire about data availability or to order your Landsat satellite data, please contact ACRES or your ACRES Landsat distributor. Prices for ACRES Landsat data can be found in the Landsat 7 ETM+ price list, the Landsat TM price list and the Landsat MSS price list.
Trading conditionsSpecial copyright conditions apply to the sale of satellite data. In order to purchase satellite data products, users must agree to the licence conditions covering its use. For a copy of this Licence please contact ACRES@ga.gov.au or your nearest ACRES Distributor. |
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||