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Signal Data (or RAW data) cannot be viewed as a scene. It is an unprocessed
matrix of time delays that has been repackaged to fit into standard CEOS
format. Clients will require SAR processing capabilities to use Signal Data
(level 0).
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Single Look Complex processing level data is stored in slant range.
It has been corrected for satellite reception errors, and includes latitude
and longitude positional information. In addition, Single Look Complex data
retains the optimum resolution available for each beam mode and the phase
and amplitude information of the original SAR data. Data cannot be directly
viewed as images by all software.
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Path Image processing aligns the scene parallel to the satellite's orbit
path. Latitude and longitude positional informaiton has been added to the
data.
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Path Image Plus uses smaller pixel spacing than Path Image to retain full
RADARSAT beam mode resolution. This will enhance your ability to make
detailed analyses of point targets or to obtain subsequent spatial information
if required. However, it will create a digital file which is considerably
larger than a Path Image product.
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Map Image processing orients the scene with "North Up" and corrects the
scene to a map projection.
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Precision Map Image processing orients the scene with "North Up" and may
provide even greater positional accuracy than Map Image processing. Ground
Control Points (GCPs) as well as a map projection are used to spatially align
the scene. (Note: Suitably scaled maps or GCPs must be provided by the
client for most areas outside of Canada.)
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Ortho-Image processing removes terrain distortions inherent in satellite
imagery, particularly in areas of high relief. The scene is oriented
to a standard map projection, corrected with a digital elevation model
(DEM) and GCPs. DEM and suitably scaled maps must be provided by the
client as required.
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