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Pansharpening and Mosaicking Landsat 8

On February 11, 2013, Landsat 8 was launched adding to the constellation of Earth imaging satellites. It is the seventh satellite to reach orbit successfully but the eighth satellite in the Landsat program. Landsat 8 operates in the visible, near-infrared, short wave infrared and thermal infrared spectrums. It captures an average of 400 scenes a day ranging from Earth’s land surfaces to its polar regions. Landsat 8 data is freely available for download. Landsat 8 data can be acquired a number of different ways through the USGS website http://landsat.usgs.gov/. Google Earth, Earth Explorer or Glovis are all tools available to download imagery. Please refer to our tutorial on acquiring Landsat 8 data for more information on downloading imagery. This tutorial shows the steps required to pansharpen and mosaic a number of Landsat 8 images.

Initial Project Setup

1. Open Geomatica 2013’s Focus application

a. To do this through the Geomatica toolbar, click on the Focus button.

2. To view the extracted images in Focus drag and drop the _MTL.txt into the Focus window.

3. Select MS to load the multispectral channels. Click OK.

4. Drag and drop the _MTL.txt into the Focus window a second time. Select PAN to select the panchromatic channels. Click OK.

5. Repeat this step to load all images into the Focus viewer.

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PANSHARPEN

Creating a pansharpened image by combining the multispectral data (30m resolution) and panchromatic data (15m resolution) will result in a high resolution 15m color image.

1. Open the Algorithm Librarian from the Tools menu.

2. Navigate to the PANSHARP algorithm.

3. Select multispectral channels 4 3 2 for a true color image. 4. Select panchromatic channel 8.

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5. Select an output file name and location. 6. Click Run.

7. Run the PANSHARP algorithm on all images in your dataset.

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MOSAIC

Creating a mosaic of the images will allow for a seamless image. This is done through OrthoEngine.

1. Open the Geomatica 2013 OrthoEngine application.

2. In OrthoEngine click File New.

3. Give your project a Filename, Name and Description. 4. Select None (mosaic only) under Math Modeling Method. 5. Click OK.

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6. Input the appropriate Output projection and GCP projection information for your

project.

7. Select Data Input as the Processing step. a. Click Open a new or existing image

b. Click New Image. c. Navigate to the location of the data. d. Click Yes when asked if you wish to create overviews now. e. Repeat this step for all your images.

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8. Select Mosaic as the Processing step. a. Click Define mosaic area.

9. In the Define Mosaic window select a file name and location for the output mosaic file. a. Click OK.

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10. Select Automatic mosaicking from the OrthoEngine Toolbar

11. The default parameters can be used in the Automatic Mosaicking window or changes

can be made to the color balance, cutlines or blend width.

a. Click Generate Mosaic when ready to do so. This may take a while.

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b. Click OK when the mosaicking process has completed. c. Save and close the OrthoEngine Project.

To view the final mosaic, simply drag and drop the file into Focus.