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UNIVERSITY OF WINDSOR
Department of Civil and Environmental Engineering
GIS Data Modeling
Dr. H. Maoh Summer 2022 Assignment 1: INTRODUCTION TO ARCGIS 10.8.1
Due: Upload to Assignment Drop Box on Blackboard by 10:30 AM on Monday May 30, 2022. Instructions: Answers must be typed using Microsoft Word or some other word-processing package. Read the steps provided carefully and apply them to the data available for this assignment in the file Assignment1_Data.zip
Grading: Style and format is worth 10% of your mark. Total mark is 100.
PART I: INTRODUCTION (30 Marks)
A. The data for this assignment are compressed into a zip file which is located on the course website on Blackboard under Resources>Assignments>Assignment01 in the file Assignment1_Data.zip. Download the file and extract the Assignment1_Data folder to your Desktop.
B. Open ArcMap 10.8.1 by choosing ArcGIS from the program list and clicking on ArcMap 10.8.1. C. In ArcMap, go to File>Open then Navigate to Desktop>Assignment1_Data>Part1. Select Map1.mxd and press OK. You should now see six names on the screen. In the Table of Contents of ArcMap, you will see exclamation marks beside each of the entities (layers) listed. Since you are using a map document that was created in a different work environment, you will have to re-establish the linkages to the data. To do this, select the 6Cities layer, right-click and go to Data then select “Repair Data Sources…”. You will notice at this step that you will need to connect to the assignment folder. This can be done using the button. Once you establish a connection to the folder, navigate to Assignment1_Data>Part1>World and select the file 6cities.shp and press Add.
D. Turn on only the two layers: Countries and 6cities.
E. Use the Identify button to explore attribute information for the six cities listed on the map. Notice what happens when you click on a certain feature on the map
F. Double click on the Countries layer, go to Symbology, choose Quantities, then Graduate Colors and set the Value: under the Fields to (POP_CNTRY) as your Value field. Next set the Number of Classes to 20. Use the following color ramp setting:
G. Add the Grid30 layer to the map using the Add Data button . Move the Grid30 layer so the countries layer is on top of it. Also, make the color of the Grid30 Hollow.
1. Provide the name of the country that each of the six cities belong to and the population of each of these six cities? (6)
2. In the map view, insert a textbox using Insert>Text from the menu bar and provide the following information in it: Your name, Student ID, Assignment Number and Date of Assignment. Move the text to the top left-hand side of the map view. Provide a screen capture showing your updated map including the added text. (6)
3. What is the purpose of Symbology in ArcMap? (4)
4. Each of the theme layers you are working with is called a shapefile. What type of features can be represented by a shapefile? List the shapefiles you have in your ArcMap Table of Contents and the type of feature each shapefile represents? (10)
5. Measure the distance between Phoenix and Berlin and report the outcome as a rounded number in Km? (4)
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Part II: PROJECTIONS AND DATUMS (30 Marks)
A. GIS data projection changes the coordinate system label, and also re-calculates the x and y coordinates into the new projection. Sometimes you may have multiple data sets of the same location that are stored in different projections and/or coordinate systems. In ArcMap, the Project tool exists to allow you to convert data sets from one projection to another. In this part of the exercise, you will use this tool to help you overlay two layers representing roads and a background aerial photo for the central area of downtown London, Ontario. You will start by creating a new map document. Click the New Map File button on the button bar. This will close the Map1.mxd and leave you with a new blank map screen.
B. Use the Add Data button and navigate to the London folder by going to Assignment1_Data>Part2>London and add the two layers (Roads shapefile and Aerial_photo) to the data frame.
C. Right-click on each of the layers and click Zoom to Layer. You should notice that both layers do not overlay on top of each other. If you zoom to the full extent, you will notice that the two layers do not appear at all. This occurs because the two data sets are in different coordinate systems. Therefore, they do not overlay on top of each other.
The aerial photo of downtown London is projected to UTM NAD83. You can check that after loading the photo in ArcMap, then going to layer properties, then click on the Source Tab. Scroll down until you get to the XY coordinates. You will see that the value is set to NAD_1983_UTM_Zone_17N. On the other hand, the roads shapefile is in Geographic coordinates (GCS North American 1983). Since these two layers are in different coordinate systems, you will need to project the roads shapefile so that they can eventually line up spatially (i.e., they can be superimposed on top of each other). However, prior to using the Project tool, you will need to define the spatial reference for the roads network shapefile since it is missing the .prj file, and then you can project it to display on top of the aerial photo. It is absolutely critical to Define Projection first. ArcMap must be informed what the initial projections/coordinate system is before a new projection can be applied.
E. Define the projection for the roads shapefile using the following projection information: > > > NAD 1983. Once the projection is defined, you will notice that the road network will show on top of the aerial photo.
6. Provide a screen capture of your work with the projected roads layer superimposed on the London downtown aerial photo. Change the color of the roads layers as well as the thickness of the lines to make the roads more visible on the map. Do not forget to enter a textbox with your name, student number, tutorial number and date as part of your map (5)
F. Next, use the Project tool under Features to project the roads layer to match the aerial photo layer. Create a new ArcMap document by clicking on the New button . Load the Roads shapefile that you defined the projection for from the previous steps. When datums are different, the same coordinate location will fall in a slightly different spot, causing misalignment between the maps. Using the original unprojected London road network from the previous step, create two new shapefiles in which the output data is first projected in UTM NAD 1927 and the other is projected in UTM NAD 1983. Notice that the difference between these two datums will depend on where specifically you are in North America. Call the projected layers Roads-NAD27 and Roads NAD83, respectively.
G. Add the Intersection shapefile layer to the Map view. Next, select the Intersection layer, right-click and select Zoom to Layer. H. Select the identify button and click at the intersection of the two roads. Record the X and Y coordinates shown in the location box. Report your results in a table with rows x and y, and columns for NAD1927 and NAD1983
I. Calculate the distance between the NAD1927 and NAD1983 Coordinates.
7. What UTM Zone should be used when projecting the road network of London, Ontario? (5) 8. Report the X and Y values you recorded from steps G, H and I. What is the difference (in meters) between the NAD27 and NAD83 at the location you zoomed in at. Calculate and report the difference in the X and the difference in the Y, then the distance. Further, measure the distance using the Measure Distance button . Is the result similar to the one you have calculated? (10)
9. Provide a screen capture which shows the two projected road layers Roads_NAD27 and Roads_NAD83 in different colors on top of the aerial photo. (5)
10. Which of the two projected layers (NAD27 or NAD83) is more adequate and why? (5)
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PART III: DEALING WITH ATTRIBUTE TABLES (30 marks)
A. Open a new Map view and load the shapefiles from the folder Assignment1_Data>Part3
B. Click on the Windsor_Landuse layer, right click and select open Attribute Table
C. Under options, go to Select by Attributes and provide the following criteria in the textbox:
“CATEGORY” = ‘Parks and Recreational’
This can be done by double clicking on the field “CATEGORY” and typing the = ‘Parks and Recreational’ D. Go back to the map and observe what happened. Right click on the Windsor_Landuse layer go to data and select Export data
E. Step D will allow you to create a new shapefile that has only the features that correspond to the Parks and Recreational land use in the region. Call the new shapefile PR-Windsor.shp
F. Load the new shapefile in the Map view.
G. Go to Geoprocessing>Clip to create a Parks and Recreational land use layer that fall within the boundary of the City of Windsor. Once the new layer is created, turn off all the layers except for the new layer and the City of Windsor boundary layer. Set the color of the Windsor Boundary Layer to “Ultra Blue” and the Parks and Recreational land use to “Topaz Sand”. Select the City of Windsor Boundary layer, right-click and select Zoom to layer.
11. Provide a screen capture of the new map to your report. Be sure to include your name, student number and date. (5)
H. In the Windsor_Landuse layer, open the attribute table, click on the Shape_Area field and then right click to select Statistics.
12. Provide a screen capture of the window that appears on screen. Explain what you observe. (5)
I. In the Windsor_Landuse layer, clear all selection then Clip the layer using the City of Windsor Boundary. J. Open the attribute table of the Windsor_Landuse_Clip layer, click on the Category field and then right click to select Summarize. Click on the plus sign besides the field Shape_Area to summarize it, then check the box besides the Sum item. K. Add the new table that you created to the view and open it.
13. Provide a screen capture of the window of the table from step K. Explain what this table is telling you. (5)
L. Add the table traffic_flows.dbf to the Map view of ArcMap. You will now join this table to the attribute table of the Windsor_links layer by using the field S_ID as a common field. To do so, select the Windsor_links layer, right click and select Joins and Relates then Join. Select the Join Attributes from a table and set the field to S_ID M. Once the joint is performed, answer the following questions:
14. Select all the road links that has traffic > 1500 vehicle. You can do that by clicking on the TFLOW10AM field in the joint attribute table, right-click and select Sort Discerning. You can then select all the records with values > 1500. Provide a screen capture of the Windsor_links map while the other layers are turned off (7)
15. Using the summarize function in the attribute table, calculate the total traffic by name of road.
Be sure to clear selection from the previous step in question 14. Provide the total traffic on Cabana Rd E, Dougal Ave and Tecumseh Rd E. (8)
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