FYI, dan mohon maaf untuk yang sudah menerima posting serupa.
Rul
http://wgs84.blogspot.com
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Source:
http://landsat.usgs.gov/
http://landsat.usgs.gov/images/squares/USGS_Landsat_Imagery_Release.pdf
Timeline Set to Release Entire USGS Landsat Archive at No Charge.
22 April 2008 RESTON, VA – The USGS Landsat archive is an unequalled 35-year
record of the Earth’s surface that is valuable for a broad range of uses,
ranging from climate change science to forest management to emergency response,
plus countless other user applications. Under a transition toward a National
Land Imaging Program sponsored by the Secretary of the Interior, the USGS is
pursuing an aggressive schedule to provide users with electronic access to any
Landsat scene held in the USGS-managed national archive of global scenes dating
back to Landsat 1, launched in 1972. By February 2009, any archive scene
selected by a user – with no restriction on cloud cover – will be processed
automatically to a standard product recipe, using such parameters as the
Universe Transverse Mercator projection, and staged for electronic retrieval.
In addition, newly acquired scenes meeting a cloud cover threshold of 20% or
below will be processed to the standard recipe and placed on line for at least
three months, after which they will remain available for selection from the
archive.
Newly acquired, minimally cloudy Landsat 7 Enhanced Thematic Mapper Plus (ETM+)
data covering North America and Africa are already being distributed by the USGS
over the Internet at no charge, with expansion to full global coverage of
incoming Landsat 7 data to be completed by July 2008 (see timeline below). The
full archive of historical Landsat 7 ETM+ data acquired by the USGS since launch
in 1999 will become available for selection and downloading by the end of
September 2008. At that time, all Landsat 7 data purchasing options from the
USGS, wherein users pay for on-demand processing to various parameters will be
discontinued.
By the end of December of 2008, both incoming Landsat 5 Thematic Mapper (TM)
data and all Landsat 5 TM data acquired by the USGS since launch (1984) will
become available, with all Landsat 4 TM (1982-1985) and Landsat 1-5
Multi-Spectral Scanner (MSS) (1972-1994) data becoming available by the end of
January 2009. All Landsat data purchasing options from the USGS will be
discontinued by February 2009, once the entire Landsat archive can be accessed
at no charge.
Landsat scenes can be previewed and downloaded using the USGS Global
Visualization Viewer at http://glovis.usgs.gov [under “Select Collection” choose
Landsat archive: L7 SLC-off (2003-present)]. Scenes can also be selected using
the USGS Earth Explorer tool at http://earthexplorer.usgs.gov [under “Select
Your Dataset” choose Landsat Archive: L7 SLC-off (2003-present)]. For further
information on Landsat satellites and products, see http://landsat.usgs.gov
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