Featured Products Archive

August 9, 2004

Landsat Orthorectified TM Mosaics


The USGS EROS Data Center is pleased to announce the release of the Landsat Orthorectified TM Mosaics. These 5°x6° mosaics are derived from the Landsat orthorectified scene-based imagery data set which was released in December 2003. The majority of the collection dates range from 1987-1993. This dataset provides users with remote sensing data over much of the earth’s surface. For further information please visit Landsat Orthorectified TM Mosaics product description.

June 24, 2004

Scanning Aircraft and Satellite Film




The USGS EROS Data Center has in its possession thousands of rolls of film containing several million frames of historical aerial and satellite photographs dating back to the 1930's gathered from various federal agencies. The largest portion of this archive consists of original film acquired in support of the USGS 1:24,000 topographic quadrangle map series, taken during the 1940s through the 1970s. Most of this photography is reasonably large scale to support the production of the quadrangle maps.


The USGS EROS Data Center has implemented a high-resolution digitally scanned product. The high-resolution files are Photogrammetric quality and are created at approximately 1200 dpi with an output image size of around nine inches square. The file sizes are approximately 120 megabytes for black and white images and 360 megabytes for color images and are stored in a TIFF format. The high-resolution files are produced on either a Zeiss SCAI Precision Scanner using a PHODIS Photogrammetric Image Processing System or a Leica Geosystems DSW600 Digital Scanning Workstation. We have prepared samples of the high-resolution digital data for two frames of photography over an area of New York City taken in 1966 at a scale of 1:24,000. We're encouraging you to take a look at these samples and download them to your site-using FTP from the following location: http://edc.usgs.gov/phoenix_iv/new_york


For further information please contact: custserv@usgs.gov

June 24, 2004

Digitizing Aircraft and Satellite Film





The USGS EROS Data Center has in its possession thousands of rolls of film containing several million frames of historical aerial and satellite photographs dating back to the 1930's gathered from various Federal agencies. The largest portion of this archive consists of original film acquired in support of the USGS 1:24,000 topographic quadrangle map series taken during the 1940s through the 1970s. Most of this photography is reasonably large scale to support the production of the quadrangle maps.


The USGS EROS Data Center has implemented a medium-resolution digital product.


The medium-resolution files are non-Photogrammetric quality and are created at approximately 600 dpi with an output image size of around five inches square. The file sizes are approximately 15 megabytes for black and white images and 45 megabytes for color images and are stored in a TIFF format. The medium-resolution files are produced using a digital camera system with ADOBE Photoshop software. We have prepared samples of the medium-resolution digital data for two frames of photography over an area of New York City taken in 1966. We're encouraging you to take a look at these samples and download them to your site-using FTP from the following location: http://edc.usgs.gov/phoenix_iv/new_york


For further information please contact: custserv@usgs.gov

May 10, 2004

Landsat 7 SLC-off Price Reduction and New Gap-filled Product Release
As of May 10, 2004, the U.S. Geological Survey (USGS) is reducing the price of Landsat 7 SLC-off data from $600 to $250 per scene. As of the same date, a new SLC-off gap-filled product will also be available at a cost of $275 per scene. This product consists of an SLC-off scene in which all data gaps have been filled with histogram-matched data from a previous date. More information on the new gap-filled product and downloadable product samples are available at: Landsat 7 gap-filled product description.


All SLC-off data products may be searched and ordered on Earth Explorer or GloVis

March 23, 2004

Two New SRTM Elevation Products Now Available
The USGS EROS Data Center is pleased to announce the release of "Finished" 1 arc second (30-meter) Shuttle Radar Topography Mission (SRTM) digital elevation data on Mar 24, 2004 that has been provided by the National Geospatial-Intelligence Agency (NGA). SRTM is a cooperative project between the National Aeronautics and Space Administration (NASA) and the NGA. The radar data were acquired through the use of multiple antennas aboard the NASA Space Shuttle Endeavour during February 11-22, 2000. The mission acquired data from 60° north latitude to 56° south latitude.


Two "Finished" SRTM 1-arc second (30 m) product offerings are now available from EDC in a DTED® and SRTM format. The standard NGA DTED® formatted data can be searched and ordered from http://earthexplorer.cr.usgs.gov/srtmdted2/. The SRTM format, which is a binary raster format derived from the NGA DTED® product, can be searched and ordered from http://earthexplorer.cr.usgs.gov/srtmbil2/.

March 22, 2004

USGS ANNOUNCES NEW PRODUCT LINE
A technique to estimate radiometric values in Landsat 7 data gaps has been selected, and the resulting new products will be available to customers in June 2004.


The USGS Landsat 7 Project at the EROS Data Center in Sioux Falls, South Dakota has been taking steps to increase the utility of the ETM+ data that includes non-functional scan line corrector (SLC) artifacts. The SLC on the Landsat 7 ETM+ instrument failed May 31, 2003.


In the planned products, the gap pixels are replaced with data from a previously acquired SLC-on scene that is registered and histogram matched to the SLC-off image. The histogram matching technique is a localized linear transform performed in a moving window throughout the missing pixels.


Also, in March 2004 the current ETM+ SLC-off product will be available to the public with a user-selectable amount of interpolation to replace missing gap pixels. The USGS is continuing to research other methods of providing better gap pixel estimates/merged data products and will continue to provide information resulting from this work as it becomes available.


A sample product, with a comparison with the degraded data, further information and regular updates on the planned product release can be found at http://landsat7.usgs.gov/slc_enhancements/.

January 8, 2004

EO-1 Mission Extended and Prices Reduced!



Based on current funding projections, and in support of Landsat data users, NASA and the USGS plan to extend the EO-1 mission at least through fiscal year 2004 (through September). This assurance enables current and prospective users to plan now for EO-1 data to be captured this summer.


Additional good news for customers comes in the form of a USGS price decrease. The price decrease is the result of recently upgraded data processing equipment and will take effect on January 15, 2004. Customers now have access to over 20,000 EO-1 archive scenes - either Hyperion or Advanced Land Imager (ALI) - at $250.00 each, half the previous price. While the data acquisition fee remains at $1500 to acquire a new customer-specified scene from anywhere around the globe (poles excepted), the charge for processing the scene data is now $250.00, for a total of $1750.00 vs. the previous total of $2000.00.


Technical note: As an experimental satellite, EO-1 does not have the capacity to fill in for all data missing from a Landsat 7 scene affected by that satellite's failed scan-line corrector. The EO-1 ALI sensor can image smaller study sites, however, given its 37 km swath width. ALI scenes typically are acquired in strips 60 km along-track, of which 42 km are usable and are provided in a Level-1 product format. However, longer scenes (up to 185 km along-track) can be acquired on request at an additional charge.

January 16, 2004

Two New SRTM Elevation Products Now Available
The USGS EROS Data Center is pleased to announce the release of "Finished" Shuttle Radar Topography Mission (SRTM) digital elevation data on Jan 22, 2004 that has been provided by the National Geospatial-Intelligence Agency (NGA). SRTM is a cooperative project between the National Aeronautics and Space Administration (NASA) and the NGA. The radar data were acquired through the use of multiple antennas aboard the NASA Space Shuttle Endeavour during February 11-22, 2000. The mission acquired data from 60° north latitude to 56° south latitude.


Two "Finished" SRTM 3-arc second (90 m) product offerings of North and South America are now available from EDC in a DTED® and SRTM format. The standard NGA DTED® formatted data can be searched and ordered from http://edcsns17.cr.usgs.gov/srtm/index.html. The SRTM format, which is a binary raster format derived from the NGA DTED® product, can be searched and ordered from http://edcsns17.cr.usgs.gov/srtmbil/index.html. "Finished" data for other continents will be added as it becomes available from NGA.

December 29, 2003

Landsat Orthorectified Imagery
Through cooperative efforts between NASA and the commercial remote sensing community, the USGS EROS Data Center released two new Landsat-7 products on December 23, 2003. The Landsat orthorectified ETM+ imagery and Landsat orthorectified Pan sharpened ETM+ Imagery data sets joined the Landsat orthorectified TM imagery data set, which was used as to establish the baseline for these two new products. Together, these products form a suite of quality-screened, high-resolution satellite images with global coverage over the Earth's landmasses, which provide users with remote sensing data for tracking change over much of the Earth. For further information please visit http://edc.usgs.gov/products/satellite/landsat_ortho.html.

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