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Ers
SAR Precision Image
Products
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SAR Basic Image ProductsOther SAR Image
products are processed to increasing
levels of radiometric and geometric accuracy.
All products are multi-look (to reduce
speckle), ground range and system corrected,
calibrated to correct SAR antenna pattern
and range spreading loss.
Precision Image (PRI)
This is the standard product for most imaging-radar
applications. It is the first product from
which radar backscatter can be derived
for geophysical modelling. No correction
is applied for terrain-induced radiometric
effects, the image is not geocoded, and
terrain distortion (foreshortening and
layover) has not been removed.
Ellipsoid Geocoded
Image (GEC)
This high level product precisely locates
and rectifies the SAR image on a map projection.
Radar backscatter can be derived for geophysical
modelling. The scene measures 100 x 100
km and is rotated according to the map
grid. There is no correction applied for
terrain distortion or radiometry.
Terrain Geocoded
Image (GTC)
This is a multi-look (speckle-reduced),
ground range, system corrected image, precisely
located and rectified onto a map projection
and corrected for terrain distortion with
a Digital Elevation Model. It is the highest
level SAR image product and is intended
for applications in terrain with significant
relief and where the geo-reference is important.
Radar backscatter can be derived from the
image, but there is no correction of terrain-induced
radiometric effects. The product also includes
a file with layover areas and a shadow
mask, plus the local incidence angle for
each pixel.
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