ImageSubsettingFilteringAndStacking110131%281%29

ImageSubsettingFilteringAndStacking110131%281%29 - Lab 4...

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DIGITAL IMAGE ANALYSIS Lab 4– Subsetting, Filtering and Stacking
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Introduction Introduced to two main categories of image filters: Smoothers Edge Detectors Subset an image into three separate files, one for each band Enhance each band individually Stack them back into a single file
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Before beginning, remember to set your Session Preferences to the correct drives. Also make sure there is a check next to the No Stretch option in the Viewer section of Session Preferences . The files that you need to work on this lab are located both on blackboard and the R: drive file path: R:\GIS 4037c Digital Image Analysis\DIASpring2011\DIALab Exercises\Lab4ImageFilter\Data Ensure that you final images are saved on your X: drives. Habitual Reminder
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Open the Great Rift Valley SPOT scene as a False Color Composite . Remember, Layer 1 is actually Band 3 - NIR Band and should be applied to the Red color gun, Layer 2 is Band 2 - Red Band and should be applied to the Green color gun, and Layer 3 is actually Band 1 - Green Band and should be applied to the Blue color gun. We are going to subset this image into three separate files, one for each band. Then we will enhance each band individually and then we will stack them back into a single file.
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Above the image viewer, click the DATAPREP button on the main Imagine menu. Then click the SUBSET IMAGE button.
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When the subset menu comes up, you will have to tell the program where to find the file, and what to call the subset file. Call the first one GRV1 . The new file needs to be an Unsigned 8 bit file, and the data is Continuous . Then for GRV1 select Layer 1 only for the output file. This will give us a new imagine file called GRV1 with only Band 1 in it. Click OK ,
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Open a new viewer and make sure that the program worked. You should have a single band grey scale image in GRV1. Now subset bands 2 into GRV2 and band 3 into GRV3. This will give us 3 raw data bands to work with.
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open Band 2 (the Red band) and then go into the viewers Raster menu. Just below Contrast is an option called FILTERING . Select it, and then select
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ImageSubsettingFilteringAndStacking110131%281%29 - Lab 4...

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