Geog3561Lab05_F09 - Geography 3561/5561 Fall 2009

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Geography 3561/5561 – Fall 2009 Lab 5: Satellite Image Classification Due: In your lab session, Oct. 20 th , 21 st , 22 nd , 26 th INSTRUCTIONS Complete the lab exercises described below. When you have worked through the lab, answer the questions that appear at the end of this document. Make sure to enter your name and lab section in the space provided. Print your answers and turn them in by the start of lab next week. INTRODUCTION It is now common practice to classify satellite images to produce land cover maps of large regions. Various classification techniques exist for assigning a land cover class to each grid cell in a satellite image, but the most efficient techniques inevitably misclassify many of the grid cells in an image. It is possible to verify the accuracy of particular cells by “ground truthing” or by examining high-resolution aerial photos. LEARNING OBJECTIVES Until this point, you have mostly worked with vector spatial data in ArcView GIS. In this lab assignment, you will begin working with raster spatial data within Idrisi—a GIS that is designed primarily for raster spatial data analysis. You will use Idrisi to apply spatial sampling and create and analyze classification error matrices, an important standard technique for spatial data quality assessment. Upon completion of this lab assignment, you should understand: 1. Basic knowledge in using Idrisi. 2. How to combine bands into composite imagery. 3. How to classify satellite images with unsupervised classification. 4. The necessity for calculating thematic accuracy of data sets through sampling. 5. How to interpret an error matrix to evaluate classification quality. EXERCISES A) Setup 1. First, set up some disk space for your work on this lab. If you have not already  created a personal working folder ( C:\temp\[UofM ID] )  on your computer, do so  now. Then, create a new working folder for this lab entitled  lab05  inside of  C:\temp\ [UofM ID]  and copy all of the files in  G:\Geog 3561\lab05  into that new folder.
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2. Open  Idrisi Taiga  through the  start  menu and set up a “project environment”: From the  File  menu, select  Idrisi Explorer. Right-click inside the Projects tab, and select “New Project”. Navigate to your temporary working directory in the Browse for folder dialog and  click OK.  Make your new project is highlighted selected.  Click on it if it’s not. Now that you have specified a “main working folder,” Idrisi will use this folder as the  default location to save files and to look for files to open.  If you move your files to a  different computer, you’ll need to repeat these steps to define the project folder. B) Satellite Imagery Visualization
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This note was uploaded on 11/30/2009 for the course GEOG 3561 taught by Professor Robedsall during the Spring '09 term at Minnesota.

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Geog3561Lab05_F09 - Geography 3561/5561 Fall 2009

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