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01-ENVI-basics

01-ENVI-basics - ESM 266 Remote Sensing of Environment Jeff...

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ESM 266: Remote Sensing of Environment Lab 1, Vegetation Indices Jeff Dozier & Karl Rittger March 31, 2008 Due April 8, 2008 Objectives To set up your workspace for the course. To learn the basic elements of the image processing software you’ll be using for this course: Environment for Visualization of Imagery (ENVI). To explain your interests in this course. Background ENVI, an image processing program commonly used for analysis by remote sensing scientists, is located at Start All Programs ScienceApps ENVI3.6. The program comes with some excellent tutorial material. Your computer workspace also has a drive mapped to Bren School courses (typically the R:\ drive is mapped to \\babylon.bren.ucsb.edu\courses). Data that are needed for assign- ments in ESM 266 are in R:\Spring2008\ESM266. Starting to Use ENVI (1) Display a multi-band image. Once you have ENVI running, click File Open Image File and choose the file can_tmr.img from the directory R:\Spring2008\ESM266\Assignment01 . This brings up a small window that lets you pick different bands of Landsat Thematic Mapper data to view. Click RGB Color , then sequentially click on and combination of any three bands from the six available. The numbers in parentheses are the center wavelengths, in μm, of each band. To see a true-color image, load TM Band 3 into R, TM Band 2 into G, and TM Band 1 into B. Now click Load RGB , and now you should be looking at a Landsat TM image of Canyon City, Colorado. If you get stuck at any point while using ENVI, the Help menu is pretty good. Three display windows will appear: Scroll, Image, and Zoom . In the Scroll window, use the mouse and left click and drag to move the red box. Note how this changes the contents of the Image window as well as the Zoom win- dow if you move far enough. In the Image window, use the mouse and left click and drag to move the red box and note how this changes the contents of the Zoom win- dow. The Scroll window shows the entire image at reduced resolution, and the Image window shows a portion of the image at full resolution.
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