Geography Reference
In-Depth Information
the computer is capable of producing—millions of them 15 —but without benefit of being able
to name the color or easily select it again. The Color Selector window lets you define a color
in the most basic way. You can move the R, G, and B sliders to determine the amount of red,
green, and blue, each on a scale of zero to 255, that go into making up the color that will wind
up on the polygons. As you move the sliders, the lower-left rectangle in the window shows the
new color. Adjacent to it is the current color that is to be changed. In the area of the window
just up from the bottom is a box showing, as a continuum, all the colors. Clicking or dragging
in this box is also a way to select a color. Try this out, watching the text boxes and the slider
bars. Move the cursor both horizontally (to change colors) and vertically (to change brightness).
Finally, pick a garish yellow by typing in the boxes—say, R255, G255, B99. Click OK.
21. Click the polygon symbol in the T/C. This brings up a Symbol Selector window. Here, you can
modify the outline width and the outline color. Make the color a light green with an outline color
red. You could also open the Symbol Properties window by clicking the Edit Symbol… button,
and there you will have access to another bunch of options. In fact, you could doubtless spend
half a workweek exploring the possibilities that ArcMap gives you in the color arena. For now,
just cancel the Symbol Property Editor, and press the Style References button.
This menu shows you the different symbol sets that come with ArcMap. It is simply another way to get at
the list of Styles available to you.
Adding and Using a Style
22. Clear off the menus and windows.
Add the shapefile some_points from the
___IGIS-Arc_ YourInitials \Trivial_GIS_Datasets.
folder. You get the generic dot. Look briefly at the attribute table for some_points.shp. Note
that TYPE_ is keyed to the polygon the point is in: M, A, or P. Hide the table. Bring up the related
Style References window again. Let's go for something really ridiculous: click 3D Trees and OK.
This now gives you the capacity to replace the generic dot with elements from a style sheet
called 3D Trees. Click Close on the Style Manager window. In the T/C, click the some_points
symbol. A Symbol Selector window appears with a plethora of tree images. Slide down through
the list, taking a botany lesson as you go. How many trees are there? 16
23. Pick a Rocky Mountain Maple, either by scrolling down in the alphabetized list or by typing it in the
text box which says “Type here to search.” 17 Click OK. It's pretty hard to see that you have made any
difference in looking at the Data View. Return to the Symbol Selector window. Use the maple again
but change the size to 50 points. The symbol has taken on some form. To see it in all its pixilated
glory, change to the Layout View and zoom in on a point, using the zoom on the Layout toolbar.
24. Zoom to the whole page and go back to the Data View.
15 256 * 256 * 256 - you do the math.
16 Just kidding.
17 If this is the first time you have used the search, it may take a while to initialize and you will see a message that says
“Updating index database…”
 
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