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Lecture

Lab Answers: Buffering II And Creating Fields

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Department
Geography
Course
GEO 221
Professor
Steven Swales
Semester
Fall

Description
RYERSON UNIVERSITY Department of Geography GEO 241: CARTOGRAPHIC PRINCIPLES AND PRACTICE FALL 2012 LAB 3: EXPERIMENTING WITH CARTOGRAPHIC SYMBOLS This lab is an opportunity to apply concepts of graphic logic and cartographic standards, and experiment with symbolization using ArcMap. The submission for the lab is the printed coloured map; there are no written answers needed. THE MAP IS DUE AT THE END OF THE LAB PERIOD. CONTEXT The purpose of the map is to promote recreational opportunities in Prince Edward County in Eastern Ontario. The last census (2011) records the population of the county as 25,260 residents. Well known for its beautiful sand beaches on the shores of Lake Ontario, it has more recently been a leader in culinary tourism in Ontario and a number of wineries have grown up in the last few years. The map will show both types of attractions. The data have been created for this lab from information on the Prince Edward County Official Tourism Website (http://prince-edward-county.com/). Key Concepts: Distinguishing qualitative data on a map by symbol properties Distinguishing quantitative data on a map by symbol properties Adhering to cartographic standards for symbols Sizing cartographic components to reflect their importance Creating appropriate map titles and legends Key Skills: Setting relative paths for data layers Changing the order of layers Using the Symbology options for map features Editing legends Creating layouts GETTING STARTED Copy the folder labelled 241lab3F12 in LaskinTeaching on the Z: drive to your desktop. Open ArcMap. Because you will be using the map you create for Lab 4, the first thing you need to do is to make sure that all of the data layers will be accessible even if you use a different computer. You need to set the paths of the data layers to your ArcMap document. Instead of storing a full path name with the drive, if you set the relative path then the layers are attached to the ArcMap document only (as long as you keep everything in the same file.) In the Main menu, select CustomizeArcMap Options and check the box which says: Make relative paths the default for all new ArcMap documents CREATING A DATA VIEW 1. Adding ShapeFiles Click on File along the Main menu, and then Add Data or click on the Add Data tool. With the desktop selected, in the 241lab3F12 folder, add ALL of the .shp files to the Data View by clicking on each one with the Shift key held down and Add. Your Data View should list twelve geographic features as layers: Ont_water PEC boundary PEC brewery PEC conserv area (conservation areas) PEC Information (visitor information centre) PEC picnic (picnic sites) PEC places PEC prov wildlife (government wildlife areas) PEC provincial park PEC roads PEC trails PEC winery PEC represents Prince Edward County data. You can name the Data View by clicking on View in the main menu and Data Frame Properties, selecting the General tab and filling in an appropriate name. Because one of the files has Ontario-level data, the map of Prince Edward County is very small. Right-click on the PEC boundary layer in the Table of Contents and Zoom to Layer to set a more appropriate scale. 2. Changing the Order of the Layers Note that the layers are grouped by shape of feature and, within those shapes, they are ordered alphabetically. You need to change the order of the layers so that all of the data can be seen. Make sure List by Drawing Order is selected at the top of the Table of Contents window (first button on the left), then just click on the layer name and drag the layer to put it in the desired order. 3. Symbolization For this lab, there are a number of changes to make in the symbolization. You will need to distinguish different area, line and point features and you will need to distinguish the attributes of two layers: trails and places. In all cases, you need to remember what the purpose of the map is and choose symbols accordingly in terms of emphasis (ordinal differences) and cartographic standards. 3a. Symbolization to distinguish areal features There are a number of area features to distinguish: the water, wildlife areas, provincial parks and the county itself. To change the symbolization, right click the layer name, and select Properties. Select the Symbology tab and click on the symbol. Or click on the symbol underneath the layers name. A Symbol Selector window appears in either case, indicating the properties of the symbol. You can change the properties of the features to more appropriate symbols. Think about whether there are any cartographic standards or colour associations. 3b. Symbolization to distinguish lines Change the symbol for roads appropriately using the process in 3a. 3c. Symbolization to distinguish attributes of a line feature Next, you are going to identify the different types of trails. Open Attribute Table of the PEC trails layer to determine the possibilities. WHAT LEVEL OF MEASUREMENT IS THE ATTRIBUTE OF TYPE? HOW ARE YOU GOING TO DISTINGUISH THEM? Right click on the layer, click on PropertiesSymbology tab, noting that the Feature is Single Symbol. Click on the other possibilities in the Show window to reveal the mapping techniques available. Chose Categories Unique Value technique to distinguish the type of trails. Remember Lab 1 [Remember to choose the correct Value Field; Add All Values; uncheck ] You may want to change the hue, shape and/or width of the lines by double clicking and choosing different properties in the Symbol Selector window. [Note that one trail follows one of the roads so you may need some adjustments to the road or trail symbols once you display them.] 3d. Symbolization to distinguish attributes of a point feature You are going to distinguish the places in Prince Edward County by their population size. WHAT LEVEL OF MEASUREMENT IS THE ATTRIBUTE OF TYPE? HOW ARE YOU GOING TO DISTINGUISH THEM? Right-click on the layer PEC places and Open Attribute Table. There are no populations given but there is an attribute of PPN_CODE with values of 2 and 3. 2 represents small population centres with populations of 1,000 to 29,999. In this case, according to the 2011 census, Picton has a population of 4,487 and Wellington has a population of 1,860. 3 represents rural communities (populations less than 1,000). Close the Attribute Table. To distinguish the places by population, go to the Symbology tab of the layer and choose Quantities Graduated symbols. Scroll in the FieldsValue: and select PPN_CODE. In this case, 2 has a higher value than 3. Right click on Symbol (above the actual symbols) and choose Flip symbols so that the larger symbol represents the 2. In the Label column in the Symbology window (this is what you are going to see in the map legend), give the corresponding ranges a description which makes sense. Apply to see what the changes look like on the map. You may need to adjust Symbol Size. You may want to change the hue as well. 3e. Symbolization to distinguish point features There are five different point features to distinguish with the Symbol Selector window: brewery, conservation area (note this feature is designated as an "area" but at the scale of the map it will be represented by a point symbol), information centre, picnic site and winery. Remember the appropriate visual variables to use to distinguish qualitative differences. Do any of the features have an associative hue or shape? CREATING A LAYOUT In this layout, you are going to display the map (Data View), and add title legend scale north arrow neatline inside the margins of the layout
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