Landsat imagery mosaic series
The landsat thematic mapper (TM) satellite image mosaic uses 87 separate satellite scenes. The mosaic order follows Landsat paths, from south to north, and west to east, so the northern and eastern most scenes are overlayed last (i.e. are on top).
To provide landsat thematic mapper (TM) satellite image mosaics.
Q Imagery (Imagery portal)- TBC
The SLATS project was founded in 1995 to investigate the woody vegetation cover and extent of land clearing in Queensland. The project uses Landsat TM satellite imagery acquired from Geoscience Australia. This imagery has a nominal ground resolution of 30 metres. The imagery is converted to reflectance units based on calibration results and the solar zenith angle at the time of image acquisition. It is standardised for atmospheric variations between dates by radiometrically registering to the clearest image for each scene (Collett et al 1998).The Landsat 2003 Thematic Mapper satellite image mosaic uses 87 separate satellite scenes captured during 2003. The scenes were selected to be as near as possible to the same date along a path, have minimum cloud, and generally have been captured during winter months.The mosaic order follows Landsat paths, from south to north, and west to east, so the northern and eastern most scenes are overlayed last (i.e. are on top). Mosaic creation method:1) Manually reproject the zone-rectified images (rectified and radiometrically corrected six band TM images) from the neighbouring MGA Zones into the Zone of interest.2) Clip the newly projected scenes to the standard SLATS `minimal overlap` template areas.3) List in correct mosaic order, input into Imagine mosaic tool, run using settings:Intersection Type = No Cutline ExistsOverlap Function = OverlayIgnore Input Values = 0Output Background Value = 0Stats Ignore Value = 0This 0.002 degree ground resolution image (approximately 220 metres) represents the average value of the original 25 metre image exclusive of 0 values. The averaging process was completed for three segments of Queensland corresponding to the three MGA zones 54, 55 and 56. The result of this was projected into Geographic coordinates (Spheroid: GRS1980, Datum: GDA94) using nearest neighbour resampling. The image was reduced to 3 TM bands: Band 5 (mid-infrared, 1.55-1.74¿), 4 (reflective infra-red, 0.76-0.90¿) and 2 (visible green, 0.52-0.60¿) to create a pseudo-colour image. The three images were joined to create a single statewide image.References:(Available at http://www.derm.qld.gov.au/slats/report.html )Collett, L.J., Goulevitch B.M., Danaher, T.J. SLATS Radiometric Correction: a semi-automated, multi-stage process for the standardisation of temporal and spatial radiometric differences. In: Proceedings of the 9th Australasian Remote Sensing and Photogrammetry Conference, Sydney, Australia, July 1998.
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