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Landsat
GTCE Products
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- Landsat 7 GTCE
- Landsat 5 GTCE
- Landsat 7 GTCE+ natural
- Landsat 7 GTCE+ false
The Landsat GTCE (Ground Terrain Corrected
Enhanced) product is a rectified Landsat
full frame. All images are geometrically
processed using the USGS 30 arcseconds
DEM GTOPO30, and control points collected
on high quality reference data. The accuracy
of the final product is below 50 meters
RMSE, but in many areas is around 30 meters
RMSE.
Landsat 5 GTCE
- seven multispectral bands, with 30-meter
pixel size.
Landsat 7 GTCE
- seven or eight multispectral bands
(according to the presence of a single
or low-high gain thermal band), with
30-meter pixel size;
- one panchromatic band, with 15-meter
pixel size.
Landsat 7 GTCE+ natural
- same as Landsat 7 GTCE, plus three
pansharpened natural color bands (corresponding
to bands ETM+ 3, ETM+ 2 and ETM+ 1),
with 15-meter pixel size
Landsat 7 GTCE+ false
- same as Landsat 7 GTCE, plus three
pansharpened false color bands (corresponding
to bands ETM+ 3, ETM+ 4 and ETM+ 5), with
15-meter pixel size
Coverage
The GTCE family products can be generated
on Landsat 5 and Landsat 7 full scenes collected
worldwide. The products are available also
on floating scenes.
Reference system
The default reference
system is UTM/WGS84. The
UTM zone is chosen according
to the longitude
The product is also available with client-defined
reference system. In this case the client
that must specify:
- Projection type (eg: Transverse Mercator)
- Projection spheroid (eg: International
1909)
- Projection datum (eg: European 1950)
- Other relevant parameters for the projection,
if needed (example: scale factor at central
meridian, longitude of central meridian,
latitude of origin of projection, false
easting, false northing, etc.)
All these parameters must be fully available
in order to generate the final product.
Accuracy
The processing is carried out on the
basis of the USGS GTOPO30 30 arcseconds DEM
and of the high accuracy reference data.
The resulting accuracy is in the range 30-50
meters RMSE. Control points from ephemeris
data are not used in the processing, due
to the low declared accuracy achievable.
Pansharpening
Pansharpened products are generated
by merging the colour information contained
in the 30-meters three visible (blue, green
and red) or visible-infrared (green, near
infrared, mid-infrared) multispectral bands
with the geometrical information contained
in the 15-meters panchromatic band.
The result of the processing is a natural
or false color pansharpened image, with
15 meters resolution. The processing is
carried out by using an Eurimage proprietary
pansharpening algorithm. |
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