4 June 2004
ACRES Landsat imagery is now available in Geographic Tagged Image File Format (GeoTIFF).
Introduced in response to requests from ACRES customers, this image format is initially available for Landsat 5 and Landsat 7 ortho-corrected and map-oriented image products.
GeoTIFF is being widely adopted in the GIS field, and is becoming a popular industry-wide image format for data storage and transfer across operating system environments and applications. GeoTIFF offers the capability to embed a wide range of georeferencing information within the TIFF (Tagged Image File Format) file.
The ACRES GeoTIFF-format product will be available from 4 June 2004. Prices will remain the same as other Landsat formats.
1 April 2004
ACRES has now successfully installed software that enables it to process and produce Landsat 7 ETM+ SLC-Off products. An instrument malfunction occurred onboard Landsat 7 on 31 May 2003. Following this, notification from USGS was received to suspend all acquisitions until the exact cause of the anomaly could be determined. A mechanical malfunction with the Scan Line Corrector (SLC) was found to be the cause of the problem and therefore switched off. Subsequently, acquisitions resumed on 15 July 2003 in SLC-Off mode.
The SLC problem, now inherent in all Landsat 7 data acquired after 14 July 2003, has been minimised by interpolation and extrapolation techniques used during the processing of the raw signal data into the suite of Landsat 7 SLC-Off products now available from Geoscience Australia.
To encourage customers to use SLC-Off products, ACRES is offering a 50% discount off the normal Landsat 7 recommended retail price for all SLC-Off products. This is a special introductory offer for a limited time only. Note that SLC-Off products are available for all processing levels and scene sizes offered for regular Landsat 7 products.
For more information about the processing techniques used, and effects of SLC-Off on ACRES products, visit our SLC technical information page.
ACRES are currently also looking into how to enhance the suite of SLC-Off products by reducing the gaps. For further details on this work refer to the SLC-Off image mosaic.
All SLC-Off data acquired by ACRES is also now viewable from the ACRES on-line digital catalogue.
To download a free sample of an ACRES SLC-Off data product please go to the ACRES FTP site.
If you have any further comments or questions regarding ACRES SLC-Off products please send an e-mail to earth.observation@ga.gov.au.