to follow

ADMAP is a Gridmerged compilation of over 700 individual survey TMI grids, with a cell size of approximately 80 m (in fact it is 0.00833333 degrees). The first preliminary grid at this resolution with data type IEEE4ByteReal has been further processed in the Fourier domain to produce a half vertical derivative grid, called "aust_18122007_008333_vd05.ers"

Includes copy of AGSO Record 1997/20

Pan-sharpened satellite imagery of the Cocos (Keeling) Islands recorded using the QuickBird Digital Globe satellite, taken over the islands in November 2003. Each pixel represent 0.6m.

Two ERS satellites have been developed by the European Space Agency (ESA). ERS-1 was launched on 17 July 1991 and ERS-2 on 20 April 1995. Both ERS satellites travel at an altitude of 785 kilometres and provide coverage of the entire globe every 35 days. The C-band, Synthetic Appeture Radar (SAR) sensor has been the primary Earth-observing instrument. The SAR is an active microwave sensor capable of imaging earth resource targets regardless of time of day, cloud, haze or smoke cover of an area. The instrument is classified "active" as it emits the energy necessary to image the earth's surface. In contrast, "passive" or "optical" sensors rely on the sun's reflected energy to image the earth. The SAR ground swath is 102.5 kilometres wide, with a nominal 30 metre pixel resolution. The sensor has VV polarisation. ACRES ERS-1 archive includes data acquired from September 1991 to March 2000, while ACRES ERS-2 acquisitions started in November 1995 and continues to present.

The JERS-1 satellite was developed by the National Space Development Agency of Japan (NASDA). JERS-1 was launched in February 1992 and operated until 11 October 1998. The satellite traveled at an altitude of 568 kilometres and provided coverage of the entire globe every 44 days. The L-band, Synthetic Appeture Radar (SAR) sensor was the primary Earth-observing instrument. The SAR is an active microwave sensor capable of imaging earth resource targets regardless of time of day, cloud, haze or smoke cover of an area. The instrument is classified "active" as it emits the energy necessary to image the earth's surface. In contrast, "passive" or "optical" sensors rely on the sun's reflected energy to image the earth. The SAR ground swath is 75 kilometres wide, with a nominal 18 metre pixel resolution. The sensor has HH polarisation. ACRES JERS SAR acquisition commenced in September 1993 and ended in October 1998.

These data are the time series recorded by Geoscience Australia`s geomagnetic observatories in Australia and Antarctica. Australian observatories are located near Canberra (ACT), Charters Towers (Queensland), Alice Springs and Kakadu (NT), Gnangara and Learmonth (WA). Antarctic observatories are located at Macquarie Island, Mawson and Casey. The time series record the temporal variations of three components of the geomagnetic field and its total-field strength at each location. The rates at which the variations are recorded are once per second for the 3-component data and once every 10 seconds for the total-field data. These time series are also used to derive a range of subsidiary time series consisting of data samples at 1-hour, 1-day, 1-month and 1-year intervals. These data are calibrated by regular (usually weekly) absolute measurements of the magnetic field. These calibrations allow corrections to be made for instrument drift so that the long-term (annual, decadal) variations of the geomagnetic field can be tracked accurately.

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SPOT 1, launched in 1986 by the French Government agency, Centre National d'Etudes Spatiales, carries two High Resolution Visible (HRV) sensors. Two SPOT satellites (SPOT 2 & 3) currently orbit the earth 180 degrees apart with SPOT 2 being the nominally operational satellite but data from SPOT 3 can be acquired on request. Each HRV has a ground swath 60 kilometres wide, and can operate independently either in panchromatic (PAN) or multispectral (XS) mode. SPOT 3 carries the only operational onboard tape recorders which store imagery when the sensors are operating outside the reception area of a ground station, allowing worldwide coverage by SPOT. Every 26 days, SPOT's orbit can provide total coverage of the Earth's surface, in a vertical viewing mode. Additionally, SPOT has the ability to image up to an angle of 27 degrees east or west of vertical. This can allow revisits of the same site in Australia in as little as three days, and also allows for stereo images to be acquired for use in determining the height of ground features. The archive of ACRES products includes SPOT data from 1989 onwards. The 10-metre resolution of SPOT's one-band panchromatic (PAN) sensor provides digital imagery in the highest resolution currently available from commercial satellite systems. ACRES SPOT archive contains selected imagery from the following SPOT satellites: - SPOT 1 commenced 1 January 1990, ceased January 1991. - SPOT 2 commenced 1 January 1991, continuing. - SPOT 3 selected from 25 September 1993.

No available information