Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GCPWORKS|Registration+Scenarios">Registration Scenarios</a><hr>
<H4>Satellite Ortho Model</H4>
Scenario: I wish to collect GCPs for use with the PACE Satellite Ortho package.<p>
The satellite ortho model reflects the physical reality of the 
complete viewing geometry and reflects all the distortions generated during 
the image formation:
<P>
<UL>
<LI> distortions due to the platform (position, velocity, and orientation);
<LI> distortions due to the sensor (orientation, integration time, and 
field of view);
<LI> distortions due to the earth (geoid, ellipsoid, and relief); and
<LI> distortions due to the cartographic projection (ellipsoid, and 
cartographic reference)
</UL>
In the GCPWorks Setup panel, select
<P>
<UL>
<LI> collect, review GCPs only
<LI> satellite ortho
<LI> user entered coordinates
</UL>
Select the uncorrected image.  The uncorrected image must have been read 
by one of the PCI Version 6 (or higher) SATORTHO programs:
<P>
<UL>
<LI> MEOSAT
<LI> MSAR
<LI> MLANDC
<LI> MSPOT
<LI> MSPOTC
<LI> MJERS1
<LI> MINGAC
<LI> CDEOSAT
<LI> CDLANDC
<LI> CDSPOT
<LI> CDSPOTC
<LI> CDSAR
</UL>
This uncorrected image must contain an orbital segment 
(usually segment 2)
which stores all the image ephemeris data. The File Browser can be used to
determine if this is the case.<p>
Enter the GCP coordinate system (i.e. UTM 11 S E000), then collect a series
of GCPs.
When GCPs are collected, the X, Y and elevation values of the georeferenced
coordinates must also be collected.  The GCPs should be uniformly distributed
over the image, and the coverage should include the
borders of the image.  GCPs with different elevations should also be collected.
This type of distribution will ensure that the model uses interpolation 
instead of extrapolation for the whole image.<p>
Review the RMS errors.  The displayed errors will be based on the actual
satellite ortho model.  Modify or remove any GCPs with large errors.<p>
Save the GCPs in the raw image file, and exit GCPWorks.<p>
From Xpace or EASI, run the SMODEL PACE program to calculate the satellite
ortho model.<p>
Run SORTHO to orthorectify the raw image using the satellite ortho model.<p>
For more details about satellite ortho modelling, please refer to the
PACE Satellite Ortho and DEM reference manual, or the Orthorectification
and DEM Extraction chapter of the Using PCI Software manual.
<P>
<hr>
Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GCPWORKS|Registration+Scenarios">Registration Scenarios</a><br>
<a href="http://www.pcigeomatics.com/dev_corner/pcihlp_gateway.html">About PCI Help Gateway</a>