Exercise_6
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Middle Tennessee State University *
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4100
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Information Systems
Date
Dec 6, 2023
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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.
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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.
12.
Your map should now have the fastest path layer. Right click on the layer and go to Styles |
Edit Symbol. Change the width to be 1 so that the line shows up better.
13.
Now add labels to both ends of the path to specify the start and end points. To do this,
from the toolbar at the top of the screen, select this button…
14.
Add the names of the start and end points as seen below.
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15.
Now we will be using another Network Analysis tool to find a 15 minute delivery area for
two San Francisco pizza shops- Escape from New York Pizza and Gialina.
16.
Select service area (from point). Escape from New York Pizza is at location
(548324.32,4180363.04). See screenshot for set up of service area. This will set up a 15
minute (900 second) service area for this pizza shop.
17.
Select service area (from point). Gialina Pizza is at location (549845.39,4176456.91). Do the
same set up as the previous step. After running this one, your map should look like the one
below. Make sure to add the text boxes and change colors if needed. As you can see, the
service areas aren’t perfect circles. This knowledge could be helpful for their pizza delivery
planning.
Final Product
18.
Take a screenshot of your map (like the one above) using the snipping tool and paste it into
a Word document. You will only be submitting the Word document with the map
screenshot and your name. Name the document YourLastName_Exercise6.docx
19.
Save your map file and close QGIS Desktop
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