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| Doing More with Graphics |
Doing More with Maps
By using the Maps item on Graphics menu, you can produce two-dimensional maps, three-dimensional block and prism maps, and surface maps. The "Graphics" chapter in Getting Started with SAS/ASSIST showed how to create a two-dimensional map. This chapter describes in more detail the different types of maps and the available advanced options. You must have SAS/GRAPH software licensed to create maps; there is no low-resolution equivalent.
Note: Under some operating systems, such as UNIX, the
maps in the SAS data library are in a compressed format and need to be decompressed
before you use them. See the SAS Software Consultant at your site for more
information. ![[cautionend]](../../../../common/65445/HTML/default/images/cautend.gif)
| Types of Maps |
Two-dimensional Maps
Two-dimensional maps are flat maps. The analysis column is divided into ranges, and each region of the map is colored according to what range its value falls into.
Two-dimensional Map Output
![[Two-dimensional Map Output]](images/2dmapreportoutput.gif)
Block Maps
Block maps are like flat maps, except that blocks are superimposed on each region of the map. Each block's height and color represents the range in which the value of the analysis column for that region falls.
Block Map Output
![[Block Map Output]](images/blockmapreportoutput.gif)
Prism Maps
Prism maps are three-dimensional maps. Each region is colored and "raised" above "sea level" to a height representing the range in which the value of the analysis column for that region falls.
Prism Map Output
![[Prism Map Output]](images/prismmapreportoutput.gif)
Surface Maps
Surface maps are another type of three-dimensional map. The values of the analysis column are not divided into ranges; instead, a "spike" is placed on each region of the map. The height of each spike represents the value of the analysis column for that region.
Surface Map Output
![[Surface Map Output]](images/surfacemapreportoutput.gif)
| Number of Levels |
For two-dimensional, block, and prism maps, the analysis column is divided into ranges or levels. By default, these levels are calculated automatically. However, by selecting Number of levels, you can specify how levels are calculated. The three options are Default number of levels (as described above), Discrete number of levels, and Enter number of levels (1-12).
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When you select Discrete number of levels, the analysis column is not divided into ranges. Each region on the map has its own color, and the height of each region's prism or block is determined by the value of the analysis column for that region.
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When you select Enter number of levels (1-12), you type a whole number from 1 to 12; SAS/ASSIST software divides the analysis column into that number of ranges.
| Additional Map Options |
Each type of map has a slightly different set of additional options. Select Additional Options to access the Additional Options menu.
Pattern and Legend Options
For two-dimensional, block, and prism maps, you can specify the pattern and color for each level, and determine the placement and configuration of the legend.
2-D and Prism Options
For two-dimensional and prism maps, you can specify the text and boundary colors, the vertical and horizontal size of the map, treat missing values as a valid level for the analysis column, and exclude internal political boundaries.
Block Options
For block maps, you can specify the color and pattern of the map surface and blocks, the size of the blocks (thin, medium, or wide), and all of the options listed for "2-D and Prism Options."
Surface Options
For surface maps, you can specify the surface color, the angle of rotation and tilt of the map, and the vertical and horizontal size of the map.
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Copyright © 2012 by SAS Institute Inc., Cary, NC, USA. All rights reserved.