Basic Analysis and Graphing - SAS

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424 Creating Maps Chapter 16 Background Maps If you look at the axes values, you can see that the area is less than 1/10° by 1/10°. The Simple Earth and Detailed Earth background maps do not display that type of resolution. The NASA server provides a fairly detailed view of any land mass on Earth. Water, however, is simply filled in as black. The NASA server is free to access, but it is also limited in availability. If the server is temporarily unavailable or becomes overloaded with requests, it delivers an error message instead of the requested map. Another Internet-based option for background maps is a Web Map Service (WMS). The WMS option enables you to specify any server that supports the WMS interface. The NASA server is an example of a WMS server, but we have provided the URL and a layer name for you. With the WMS option, you must know the URL to the WMS server and a layer name supported by the server. Most WMS servers support multiple layers. For example, one layer can show terrain, another layer can show roads, and still another layer can include water, such as rivers and lakes. By specifying the URL for the server and the layer, JMP can make a request to the server and then display the map that is returned. Unlike with simple and detailed maps, WMS maps do not wrap. You can scroll horizontally and vertically. However, beyond the -180 to 180 (x axis) and -90 to 90 (y axis) ranges, a plain background appears instead of the map. The limits of the axes are used to define the limits of the map that is displayed. In order to use the WMS option for a background map, you need to decide which WMS server to use. There are many WMS servers freely available from the Internet. Most of them provide maps only for a particular area of the world, and each of them supports their own layers. So you have to search for the appropriate WMS server for your particular situation. You can search for WMS servers on the Internet using your favorite search engine. Once you find one, you need to discover the layers that it supports. For this, you can use the WMS Explorer add-in. The WMS Explorer add-in generates a list of all the layers available on a server. You can select a layer from the list to see what it looks like. You can download the WMS Explorer add-in from the JMP File Exchange page. Note: To use the WMS Explorer add-in and the WMS background map capabilities of JMP, your computer must be connected to the Internet. To locate a server, launch the add-in through the menu items Add-Ins > Map Images > WMS Explorer. The add-in presents a text box for entering the url of a known WMS server. Alternatively, you can make a selection from a drop-down list of pre-discovered WMS servers (the list can be out of date). After specifying a WMS server, select Get Layers. Using Get Layers is not necessary if selecting from the drop-down list or if clicking Enter after entering a URL. This sends a request to the WMS server for a list of layers that the server supports. The returned list appears in the list box on the left, labeled Layers. A map of the world appears as an outline in the graph to the right. Selecting a layer makes a request to the WMS server to return a map, using the specified layer, that represents the entire earth. Selecting a different layer generates a different map. It is important to note that not all maps are generated to cover the entire earth (for example, some WMS servers might provide mapping data for a particular county, within a state). In that case, it is likely that selecting a layer will not generate any visible map. You might have to zoom in on the appropriate area before any image map is visible. The standard JMP toolbar is available in the add-in window and the zoom tool works just like it does in any JMP window.
Chapter 16 Creating Maps 425 Background Maps The graph is a typical graph in JMP, which means that all the regular JMP controls are available to you. You can adjust the axes or use the zoom tool (found on the hidden menu bar) just as you would in JMP. You can also right-mouse-click to select Size/Scale > Size to Isometric to get your graph back into a proper aspect ratio. You can also select Background Map, where you can adjust the boundary map. Once a desirable map is determined, note the URL in the text box at the top and the selected layer in the Layers list. This is the information that you need to enter in the background map window when WMS is selected as the type of image background map. Because requests are being made to a server across the Internet, there are a number of conditions that can generate an error. WMS servers often have limited availability and sometimes are not available at all. Occasionally a WMS server might return a name of a layer that it no longer supports. In these types of cases (and others), a server usually returns an error message in lieu of a map. If that happens, the error message is displayed below the Layers list in an area labeled Errors. Boundaries JMP can display boundaries (such as U.S. states or French region boundaries). These boundaries draw an outline around a defined area and can be displayed alone on a graph or combined with image data. Several boundaries are installed with JMP. Alternatively, you can create your own boundaries from ESRI shapefiles or from scratch. Because of this, the list of Boundaries that you see in the Set Background Map window can be different. When you add shape files to the built-in locations in JMP, they are available not only for the Graph Builder platform, but also for the Boundaries option in the Background Map window. In this way, you can add more political boundaries for use with background maps. Boundary-style maps are vector-based shapes. Figure 16.20 Example of U.S. State Boundaries Add a Background Map and Boundaries To add a background map and boundaries: 1. Right-click a blank area on the graph and select Background Map (or select Graph > Background Map in Graph Builder). The Set Background Map window appears.
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Version 10 Basic Analysis and Graph
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USE, DATA OR PROFITS, WHETHER IN AN
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6 Options for Categorical Variables
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8 Nonparametric Bivariate Density R
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10 Example of the Power Option . .
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12 Statistical Details for the Logi
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14 Use Categorical Variables . . .
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16 Control Animation for Dynamic Bu
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18 Launch the Scatterplot Matrix Pl
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Contents Book Conventions. . . . .
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22 Learn about JMP Chapter 1 Book C
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24 Learn about JMP Chapter 1 Book C
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26 Learn about JMP Chapter 1 Additi
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28 Learn about JMP Chapter 1 Additi
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32 Performing Univariate Analysis C
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90 Introduction to the Fit Y by X P
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238 Comparing Paired Data Chapter 8
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250 Bootstrapping Chapter 9 Example
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252 Bootstrapping Chapter 9 Unstack
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Contents Overview of Graph Builder
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258 Interactive Data Visualization
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340 Creating Overlay Plots Chapter
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