Exercise_6.docx | bartleby

BIA4100: Location Analytics Exercise 6: San Francisco Exercise Version: SP2020b Exercise Author: Erskine Credits: FOSS4G Lab Authored by Kurt Menke, GISP; Original Lab Content Author: Richard Smith, Ph.D., GISP Texas A&M University - Corpus Christi; The development of the original document was funded by the Department of Labor (DOL) Trade Adjustment Assistance Community College and Career Training (TAACCCT) Grant No. TC-22525-11-60-A-48; The National Information Security, Geospatial Technologies Consortium (NISGTC) is an entity of Collin College of Texas, Bellevue College of Washington, Bunker Hill Community College of Massachusetts, Del Mar College of Texas, Moraine Valley Community College of Illinois, Rio Salado College of Arizona, and Salt Lake Community College of Utah. Objective: Learn the basics of network analysis. Introduction In this lab, you will learn how to conduct analyses related to linear networks. You will learn how to determine the shortest path from origin to destination and how to allocate a linear network into service areas. This lab includes the following tasks:  Task 1 Basic Network Analysis Required and Recommended Tools QGIS Objective: Learn the basics of network analysis The objective of this exercise is to learn how to conduct basic network analysis. You will use the Road Graph plugin to QGIS Desktop, and you will be introduced to the GRASS plugin. You will use some of the networking tools in GRASS to allocate service areas. Task 1: Basic network analysis

In this task, you will use the Network Analysis tool to determine the delivery area for two San Francisco pizza shops. 1. Open QGIS Desktop. 2. Add the MTA_DPT_SpeedLimits shapefile to QGIS Desktop. 3. Right-click on the layer and choose Set Project CRS from layer from the context menu. 4. Choose the CRS: NAD83 / UTM zone 10N (EPSG: 26910). Zoom to Layer. Street Layer in QGIS Desktop 5. This is a street network for the City of San Francisco. Open the attribute table to see what kind of data you have to work with. Notice that in addition having the street name and type, there is a column populated with speed limits for each road segment. Close the attribute table. 6. Open the Layer Properties | Style tab and symbolize the data by speed limit. a. Choose a Categorized renderer b. Column = speedlimit c. Color ramp = Greys d. Click Classify

e. Click OK (see figure below) Styling the Street Layer by Speed Limit Your map should resemble the figure below. You can now distinguish the major arteries. San Francisco Streets Styled by Speed Limit 8. Save your map as ex6.qgs.

9. You will use the QGIS Network Analysis tool to come up with the shortest path from Lands End Park to Bernal Heights Park in San Francisco. From the menu bar choose Processing | Toolbox. 10. Expand Network Analysis in the processing toolbox. We will be finding the fastest driving path between the two parks. See screenshot below. 11. Select shortest path (point to point). We want to get from Lands End Park at location (543035.61,4181504.04) to Bernal Heights Park at location (551637.77,4177488.93) using the fastest route. See screenshot for set up.

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