geog387_lab7

geog387_lab7 - Geography 387 Fall 2011 Lab 7 Vector Spatial...

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Unformatted text preview: Geography 387 Fall 2011 Lab 7 Vector Spatial Analysis 1 Lab 7: Data Vector Spatial Analysis 1.0 Introduction This lab will introduce vector spatial analysis functions found in ArcMap. In particular, we will learn about selecting based on location, buffers, and overlay. We will use a variety of scenarios and datasets to illustrate these concepts. 2.0 Download data Before we begin, download the lab7.zip data archive into your Lab 7 folder on your USB thumb drive, or local computer C drive. Unzip the archive. You should have a lab7 folder with 4 sub-folders, one for each part of this lab. 3.0 Selecting nearby features When you analyze the relationships between map features, you might need to know which features are within a certain distance of other features ( proximity ) or share the same boundary ( adjacency ). The Scenario: Suppose you are interested in buying a gas station near Interstate 40 in Old Town, Albuquerque, New Mexico. One of your requirements is that it must be within 1,000 feet of the interstate so you can attract as many drivers as possible. Start ArcMap and open the map document lab7_part1.mxd in the lab7_part1 folder. When the map document opens, you will see a gas stations layer, a streets layer, a business layer, and a zoning layer. These are all geodatabase feature classes. Set the default geodatabase to the lab7_part1.gdb in the lab7_part1 folder from the File Map Document Properties window, and make sure that the box is checked to Store relative pathnames to datasources. If needed, use the Full Extent button to zoom to and center the data in the map window. The I-40 freeway is selected (shown in light blue, also called cyan) in the streets layer. You will use this feature to select gas stations within 1,000 feet. See the screenshot below. Note: If you need to reselect the I-40 freeway features, use Select by Attributes from the streets layer Table Options, and select "STR" = 'I40' (there should be 30 selected features). Geography 387 Fall 2011 Lab 7 Vector Spatial Analysis 2 Go to the Selection menu, Select by Location. The Select by Location tool lets you do simple GIS selection analysis. Keep in mind that the window provides a multitude of criteria that form a single selection sentence. I will provide you with the criteria for now, but later, you will have to try some of these criteria on your own. Enter the criteria as shown on the screenshot below: Geography 387 Fall 2011 Lab 7 Vector Spatial Analysis 3 This tool will select features from gas stations that are within a distance of 1,000 feet of the selected streets. Read the criteria from top to bottom so that you understand the logic in this spatial query....
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This note was uploaded on 03/02/2012 for the course GEOG 387 taught by Professor Staff during the Fall '08 term at Sonoma.

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geog387_lab7 - Geography 387 Fall 2011 Lab 7 Vector Spatial...

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