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Kompsat-5 Orthorectification

PCI Geomatics -

The Korea Multi-Purpose Satellite-5 (KOMPSAT-5) is a synthetic aperture radar (SAR) satellite unlike the optical KOMPSAT-1, 2 and 3 satellites. This is the fourth KOMPSAT satellite in the series as there is no KOMPSAT-4. This satellite was launched in August, 2013 from South Korea. The purpose of the Kompsat-5 project is to provide imagery for geographic applications, ocean and land management and monitoring of environmental disasters (https://directory.eoportal.org/web/eoportal/satellite-  missions/k/kompsat-5).

Kompsat-5 has three observation modes, High Resolution (1m resolution), Standard (3m resolution) and Wide Swath (20m resolution). The sensor has wide coverage, which allows for targets to be imaged at various incidence angles. Additionally, both left and right looking images can be collected. Both of these features are useful in environmental event monitoring.

The VNIR portion of the ASTER sensor includes two independent telescopes, a Nadir looking one and a backward looking one to help minimize image distortion during data capture. This simultaneous data capture provides true stereo coverage from which a digital elevation model (DEM) can be automatically extracted using PCI Geomatica OrthoEngine.

There are four different data products available for Kompsat-5: levels 1A, 1B, 1C and 1D. Levels 1A and 1B are officially supported for orthorectification in OrthoEngine. Each product has a different level of processing. L1A data is the raw single-look complex slant (CSC) product generated by the sensor. L1B data is a detected ground multi-look product which is created by projecting the L1A data. L1C is a geocoded ellipsoid product which is created by projecting L1A data. L1D data is geocoded and terrain corrected 1B data.

The following tutorial demonstrates how to use OrthoEngine to orthorectify KOMPSAT-5 level 1A data. The L1A file shown in the tutorial includes a Rational Functions Segment. If your data only includes an Orbit Segment you will need to create a Radar Satellite Model > Toutin’s Model project and collect GCPs to improve the accuracy. Please refer to our Training Guide for help with GCP collection.

 

Project Setup

1. Open the Geomatica OrthoEngine application

 

2. From the OrthoEngine Toolbar click File > New

 

3. Give your project a Filename, Name and Description. If your data includes only an Orbit Segment select Toutin's Model.

    a) Select Radar Satellite Modelling as the Math Modeling Method

    b) Select Radar Specific Model under Options

    c) Click OK

 

4. When the Set Projection window appears click Cancel. A popup will appear to let you know that the projection information will be read in from the first image.

Open Imagery

5. Select Ortho Generation as the Processing step

6. You can add the image directly through the Ortho Generation step. Click Open an Image.

 

7. From the File Selector window choose the H5 file from your Kompsat-5 folder

8. When prompted choose No to importing to a pix and No to creating overviews

9. From the OrthoEngine toolbar choose Schedule Ortho Generation

 

Ortho Production

10. The Ortho Image Production window will open

    a) Select the image in the Available Images box and click the arrow to move it to the Images to Process box

    b) Set a file name for your ortho image

    c) Select your DEM. For this tutorial gmted2010.pix was selected. This file can be found in the etc folder - C:\PCI Geomatics\Geomatica 201X\etc

    d) Click Generate Orthos

 

11. You can open the final ortho image in Focus

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