LandSat 7 Satellite Imagery
Overview | Selecting Files | NCSU Landsat Data Holdings | Documentation and Links
Overview
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| Landsat 7 ETM+, July 5, 1999, Path 14 Row 35 |
From a USGS Press Release, 12/27/2005: "The US Geological Survey (USGS) now offers, at no cost, selected Landsat 4, 5 and 7 satellite data. Orthorectified Landsat data are available for free download from the Global Visualization Viewer (GloVis) at http://glovis.usgs.gov and Earth Explorer at http://earthexplorer.usgs.gov."
Additionally, a lot of Landsat and other satellite data may be downloaded for free from the Global Land Cover Facility (GLCF).
See the Landsat 7 Science Data User's Handbook, the LandSat Gateway and the USGS LandSat 7 page for more information about Landsat 7 data.
NCSU Libraries has a collection of select Landsat data as listed below. Unlike earlier Landsat data, there are no restrictions on redistribution.
Selecting Files
The image below shows how the twelve scenes that cover North Carolina overlap. Notice that some locations are covered by as many as four scenes - Stanly County for example.
Click here for a larger version of this image
The North Carolina scene index is available as a shapefile in State Plane 1983 (meters) on the Geodata Server at ftp://gisdata.lib.ncsu.edu/landsat7/ or under \landsat7 by mapped drive.
NCSU Landsat Data Holdings
NCSU Libraries' Landsat data holdings and may be considered organized into two different batches, some with overlapping dates: Batch 1 was purchased by NCSU Libraries and covers roughly 1999-2000 with both "leaf-on" and "leaf-off" time periods. Batch 2 was given to NCSU Libraries by UNC University Libraries, and includes data for 1984, 1999-2002, and 2004.
Batch 1:
"Leaf-off" data is available for winter 1999-2000 and "leaf-on" data is available for 2000 (some 1999). The data is tiled in 12 scenes, identified by Path/Row in GeoTIFF format and in UTM (different zones). The images are radiometrically and geometrically corrected (level 1G product). Path/Row and image dates are indicated in the file name (e.g. L72017035_03520000306_B80.TIF is from Path 17, Row 35, and was taken March 6, 2000).
Leaf-off data
Leaf-off data dates range from Dec. 1999 to Mar. 2000 (one date per scene). A readme file briefly explains data organization. The data are currently available for NCSU access on the Geodata Server at ftp://gisdata.lib.ncsu.edu/landsat7/leafoff/19992000/ or path \landsat7\leafoff\19992000 by mapped drive.
Leaf-on data
Leaf-on data dates range from May 2000 to Sept. 2000, except for Path 19/Row 35 and Path19/Row 36 which are available for Sept. 1999 because of unavailability of cloud-free imagery for 2000. Path 18/Row 35 is made available for both May 2000 and Sept. 1999 because of partial cloud cover. The data are currently available for NCSU access on the Geodata Server at ftp://gisdata.lib.ncsu.edu/landsat7/leafon/2000/ or path \landsat7\leafon\2000 by mapped drive.
Projection: All of these images are in UTM Zone 17 except:
Zone 16: Path 19, Row 36
Zone 18: Path 14, Row 35; Path 14, Row 36; Path 15, Row 35
The WGS84 ellipsoid is employed as the Earth model for coordinate transformation.
For each scene (path/row) there are 9 TIFF images--one for each band as indicated in the following table:
The last 3 characters of the filename stem (before .TIF) indicate the band. NOTE: Filenames are very long. It may be necessary to shorten the filename to use the data in some software.
Batch 2:
1984 Data
There are 10 Thematic Mapper images from May 19 to August 4, 1984. This set is missing Path 016 Row 035 and Path 017 Row 036 in order to completely cover North Carolina. (There is a confirmed mid 1980s image available from the GLCF website for Path 017 Row 036 that can be downloaded).
Spatial resolution-28.5 meters; Format-GeoTIFF; Projection-UTM; Datum-WGS 1984; Units-Meters.
| Path 14 Row 35: 08/04/1984 |
| Path 14 Row 36: 05/16/1984 |
| Path 15 Row 35: 06/08/1984 |
| Path 15 Row 36: 06/08/1984 |
| Path 16 Row 36: 07/01/1984 |
| Path 17 Row 35: 06/06/1984 |
| Path 18 Row 35: 09/01/1984 |
| Path 18 Row 36: 06/13/1984 |
| Path 19 Row 35: 05/19/1984 |
| Path 19 Row 36: 05/19/1984 |
1999-2000 Data
There is a full set of 12 Landsat 7 images from 1999-2002 that covers North Carolina. Some of these data images were used to create the 2001 National Land Cover Database for the state.
Spatial resolution-30 meters; Format-NLAPS, BSQ; Projection-Albers Conical Equal Area; Datum-NAD 1983; Units-Meters.
| Path 14 Row 35: 03/23/2002 |
| Path 14 Row 36: 03/23/2002 |
| Path 15 Row 35: 03/08/2000 |
| Path 15 Row 36: 02/26/2002 |
| Path 16 Row 35: 10/07/1999 |
| Path 16 Row 36: 11/10/2000 |
| Path 17 Row 35: 02/24/2002 |
| Path 17 Row 36: 02/24/2002 |
| Path 18 Row 35: 10/26/2001 |
| Path 18 Row 36: 10/26/2001 |
| Path 19 Row 35: 03/10/2002 |
| Path 19 Row 36: 12/04/2001 |
2004 Data
There are 2 CDs of Landsat 7 ETM+ imagery from July 2004 for Path 16 Row 35, which covers roughly the central Piedmont area of NC excluding the southernmost counties. One image is a scan line corrector (SLC) off image, so it is gappy. Another image was used to fill the gaps. We have both the gappy and gapless images.
Spatial resolution-28.5 meters; Format-GeoTIFF; Projection-UTM; Datum-WGS 1984; Units-Meters.
Documentation and Links
Landsat 7 Science Data User's Handbook
LandSat Gateway
USGS EarthExplorer (Landsat 7 data download)
USGS LandSat 7 page
LandSat 7 data readme file
Go to the Libraries GIS Data List Page
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