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diaLab5ImageRatioingTutorial110212(1)

diaLab5ImageRatioingTutorial110212(1) - GEO 4037C AND 5033C...

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GEO 4037C AND 5033C DIGITAL IMAGE ANALYSIS Lab 5: Image Ratioing
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Introduction Image Ratioing is a way of mapping land covers and other surfaces that have a high reflectance in one band and low reflectance in another band. It is a method of removing the reflective properties of the atmosphere (scattering and absorption) and topography (shadowing, different sun angles etc.) to make analysis and interpretation easier. You will submit a screen capture of your image ratioed, density-sliced image of St. Vincent Island along with the answers to the questions found on the last two pages of the lab instruction.
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Image Ratioing See the lab 5 instructions and questions document for detailed information on what to submit before starting the lab. Copy the image that you will need from the R: drive. Path to the data is: R:\GIS 4037c Digital Image Analysis\DIASpring2011\DIALabExercises\Lab5I mageRatioing\Data DO NOT WORK DIRECTLY FROM THE R:DRIVE.
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Open ERDAS Imagine and set the Session Preferences to the directories where you will be working. Open this image with no stretch applied by Imagine, and set you Viewer Preferences to No Stretch . Also ensure that Clear Display and Fit to Frame are checked (this will display the entire image in your viewer when you open it).
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