IntroductionImage 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.
Image RatioingSee 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\Lab5ImageRatioing\DataDO NOT WORK DIRECTLY FROM THE R:DRIVE.
has intentionally blurred sections.
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Open ERDAS Imagine and set the Session Preferencesto 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 Displayand Fit to Frameare checked (this will display the entire image in your viewer when you open it).