Geomatica OrthoEngine
RASAT Orthorectification and Pansharp
RASAT is an earth observation satellite designed and developed by TBTAK Space Technologies
Research Institute (TBTAK UZAY). RASAT was produced in Turkey to provide high resolution
imagery. The multispectral imagery available from RASAT has a 15 meter resolution while the
panchromatic imagery has a 7.5 meter resolution. The RASAT satellite was launched
from Dombarovskiy Cosmodrome on August 17, 2011. Geomatica 2013 supports RASAT L1
format.
The following is a brief tutorial showing a step by step procedure for orthorectifying RASAT
imagery. A sample RASAT data set consisting of panchromatic and multispectral images of
Colorado, United States was used.
Pre-Processing Setup Multispectral Imagery
Open Geomatica 2013s OrthoEngine application
To do this through the Geomatica toolbar, click on the OrthoEngine button
Start OrthoEngine and click New on the File menu to start a new project. Give your project a
Filename, Name and Description. Select Optical Satellite Modeling as the Math Modeling
Method. Under Options, select Toutin's Model.
After accepting this panel you will be prompted to set up the projection information for the
output files, the output pixel spacing, and the projection information of GCPs. Enter the
appropriate projection information for your project.
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Data Input
Select the GCP/TP Collection option from the Processing Step drop down menu and click on
Open a new or existing image.
From the Open Image window select New Image. Select the .XML file for each multispectral
band in the dataset.
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Collect GCPs and Tie Points
Select the GCP/TP Collection processing step. GCP collection can be done using various
options: Manual Entry, Geocoded Images/Vectors, Chip Database or a Text File.
For the Rigorous model, a minimum of six accurate GCPs per image (or more, depending on the
accuracy of the GCPs and accuracy requirements of the project) are required.
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Generate an Ortho
The final step is to Schedule Ortho Generation. Proceed to the Ortho Generation processing
step and select the file(s) to be processed. Select an appropriate DEM file and set other
processing options before generating the final orthorectified image.
View the Final Orthorectified Imagery
The final orthorectified images can be viewed in Focus by dragging and dropping the files into
the display window or by clicking on File Open.
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Pre-Processing Setup Panchromatic Imagery
Start a new OrthoEngine project.
To do this through the OrthoEngine toolbar, click on File New
Give your project a Filename, Name and Description. Select Optical Satellite Modeling as
the Math Modeling Method. Under Options, select Toutin's Model. After accepting this panel
you will be prompted to set up the projection information for the output files, the output pixel
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spacing, and the projection information of GCPs. Enter the appropriate projection information
for your project.
Data Input
Select the GCP/TP Collection option from the Processing Step drop down menu and click on
Open a new or existing image.
From the Open Image window select New Image. Select the .XML file for the panchromatic
band in the dataset.
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Collect GCPs and Tie Points
Select the GCP/TP Collection processing step. GCP collection can be done using various
options: Manual Entry, Geocoded Images/Vectors, Chip Database or a Text File.
For the Rigorous model, a minimum of six accurate GCPs per image (or more, depending on the
accuracy of the GCPs and accuracy requirements of the project) are required.
The Geocoded image used for the panchromatic project was a previously orthorectified
multispectral image generated in the first part of this tutorial. This was done to ensure that the
images align properly.
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Generate an Ortho
The final step is to Schedule Ortho Generation. Proceed to the Ortho Generation processing
step and select the file(s) to be processed. Select an appropriate DEM file and set other
processing options before generating the final orthorectified image.
View the Final Orthorectified Imagery
Open Geomatica 2013s Focus application
To do this through the Geomatica toolbar, click on the Focus icon
Click on File Open and navigate to the location of the data
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Data Merge Wizard
Currently the three channels associated with this data are in separate bands. The Data Merge
wizard will join these bands into one .PIX file.
Load the multispectral orthoed imagery into Focus.
Open the Data Merge Wizard by clicking Tools Data Merge
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Pansharpen
In Focus click on Tools Algorithm Librarian PANSHARP2
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