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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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