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Unformatted text preview: ESPM 72 Introduction to Geographical Information Systems Thursday April 3rd Lab 5 Due at the beginning of the next lab, April 10th Description Today’s instruction is fairly long. Don’t worry. There are a lot of pictures. The materials are made by John Radke, a professor in the department of Landscape and Architecture. Remember that this is a ONE WEEK LAB. The objective of this lab is to make you get familiar with some analytical tools which you will use later. You can also first jump to the end to see what you are expected to complete in this lab. In this laboratory you will use some proximity (specifically buffer ) and overlay commands, which have been the main operations used in many GIS analysis. You will identify and select geographic features based on whether they are 'inside' or 'outside' the boundary of other geographical features. You will overlay or combine existing shapefiles or coverages to remove, replace, cut out, and merge their geographic features. With ArcMap9x, many of the most common between layer functions in a GIS (CLIP, INTERSECT, UNION, etc.) are available in the ArcTool Box. CLIP INTERSECT UNION The purpose of this laboratory is to introduce vertical (overlay) and horizontal (buffering) spatial operations or techniques. The intersect command brings the attributes from the overlaying coverage and adds the attributes to the intersected coverage as well as intersecting the coverage graphically. Download lab5data.zip from the website, and extract the shapefiles to your lab5 folder just as you did before. We will generate a new geology coverage containing only 'POOR' slope stability. We will join the new geology coverage and soils and generate a new coverage. Then we will clip out the coverage only within 600 feet buffer around streams. Use the three datasets below for this first exercise. PART I GETTING TO THE GEOPROCESSING WIZARDS With ArcMap9 overlay analysis became a standard capability through wizards in ArcTools . To activate this wizard go to the Analysis Tools menu....
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