Authors / CoAuthors
Abstract
The SPOT PAN data set is acquired by earth orbiting remote sensing satellites. These satellites carry two types of sensor systems known as "active" and "passive". A "passive" system generally consists of an array of small sensors or detectors which record (as digital numbers) the amount of electro-magnetic radiation reflected and/or emitted from the Earth's surface. The SPOT PAN is a passive system. The digital data acquired by the satellites are transmitted to ground stations and can be used to reconstitute an image of the Earth's surface not too dissimilar to an aerial photograph. Data are received through the ACRES antenna at the Data Acquisition Facility at Alice Springs enabling coverage of the Australian landmass. The recorded data are air-freighted daily to the Data Processing Facility in Canberra where it is catalogued and archived. SPOT-LITE was created as a result of Geoscience Australia's national mapping program. Geoscience Australia uses SPOT PAN imagery to revise its 1:250 000 scale maps. Usually two to four strips of imagery are used for each 1:250 000 map area that covers 1 degree of latitude and 1.5 degree of longitude. The imagery is acquired at near-vertical viewing angles wherever possible to minimise distortions. Each strip of imagery is geocoded, that is rectified to match ground control points which are digitised from the largest scale mapping available in the area (generally 1:25 000, 1:50 000 or 1:100 000 scales). Most SPOT-LITE tiles are also orthocorrected, that is, they have relief displacements removed through the application of Geoscience Australia GEODATA 9 second Digital Elevation Model. The three strips of imagery are then merged together to form a mosaic across the 1:250 000 map area. There may be some minor difference in visual appearance on either side of the join lines because the images were acquired on different dates with different lighting conditions and vegetation characteristics. The mosaic is divided into 24 tiles, each corresponding to a 1:50 000 map sheet area on the GDA 94 datum. Adjacent 1:250 000 areas were not mosaicked together. Because of this there may be minor differences in visual appearance between tiles on either side of a 1:250 000 sheet boundary and some minor positional mismatches. 1:250 000 sheet boundaries are clearly indicated on the SPOT-LITE catalogue with a red line.
Product Type
dataset
eCat Id
66003
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- Satellite Imagery
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- AU
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2008-06-05T00:00:00
Creation Date
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Status
Purpose
Maintenance Information
asNeeded
Topic Category
imageryBaseMapsEarthCover
Series Information
Lineage
The SPOT PAN data set is acquired by earth orbiting remote sensing satellites. These satellites carry two types of sensor systems known as "active" and "passive". A "passive" system generally consists of an array of small sensors or detectors which record (as digital numbers) the amount of electro-magnetic radiation reflected and/or emitted from the Earth's surface. The SPOT PAN is a passive system. The digital data acquired by the satellites are transmitted to ground stations and can be used to reconstitute an image of the Earth's surface not too dissimilar to an aerial photograph. Data are received through the ACRES antenna at the Data Acquisition Facility at Alice Springs enabling coverage of the Australian landmass. The recorded data are air-freighted daily to the Data Processing Facility in Canberra where it is catalogued and archived. SPOT-LITE was created as a result of Geoscience Australia's national mapping program. Geoscience Australia uses SPOT PAN imagery to revise its 1:250 000 scale maps. Usually two to four strips of imagery are used for each 1:250 000 map area that covers 1 degree of latitude and 1.5 degree of longitude. The imagery is acquired at near-vertical viewing angles wherever possible to minimise distortions. Each strip of imagery is geocoded, that is rectified to match ground control points which are digitised from the largest scale mapping available in the area (generally 1:25 000, 1:50 000 or 1:100 000 scales). Most SPOT-LITE tiles are also orthocorrected, that is, they have relief displacements removed through the application of Geoscience Australia GEODATA 9 second Digital Elevation Model. The three strips of imagery are then merged together to form a mosaic across the 1:250 000 map area. There may be some minor difference in visual appearance on either side of the join lines because the images were acquired on different dates with different lighting conditions and vegetation characteristics. The mosaic is divided into 24 tiles, each corresponding to a 1:50 000 map sheet area on the GDA 94 datum. Adjacent 1:250 000 areas were not mosaicked together. Because of this there may be minor differences in visual appearance between tiles on either side of a 1:250 000 sheet boundary and some minor positional mismatches. 1:250 000 sheet boundaries are clearly indicated on the SPOT-LITE catalogue with a red line.
Parent Information
Extents
[-44.0, -9.0, 112.0, 154.0]
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