diaLab4ImageFilteringSubsettingAndStackingInstr110208

diaLab4ImageFilteringSubsettingAndStackingInstr110208 - GIS...

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GIS 4037c Digital Image Analysis Dr. Charles Roberts Lab 4 Image Filtering, Subsetting and Stacking In the lecture, you will be introduced to the two main categories of image filters: smoothers and edge detectors. In this lab, you will selectively apply an edge detector to an image, you will learn how to subset an image and you will then learn how to stack the layers together again You will be given step by step instructions on how to do anything that is new, but for programs you have already learned, the instructions will be described in general, you will have to remember the steps necessary to achieve the instructions. Path to the data is: R:\GIS 4037c Digital Image Analysis\DIASpring2011\DIALabExercises\Lab4ImageFilter\Data Subsetting the Scene Before beginning, remember to set your Session Preferences to the correct drives. Next, enable the No Stretch option in the Viewer section of Session Preferences . 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. Above the image viewer, click the DATAPREP button on the main Imagine menu. Then click the SUBSET IMAGE button. 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 , and then 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 the same way as above. This will give us 3 raw data bands to work with.
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Applying A Strong Edge Detector Once you have all three bands subsetted, open Band 2 (the Red
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This note was uploaded on 03/30/2011 for the course GISC 4037C taught by Professor Roberts during the Spring '10 term at FAU.

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diaLab4ImageFilteringSubsettingAndStackingInstr110208 - GIS...

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