|Doing More with SAS/ASSIST Software|
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 the SAS System Using SAS/ASSIST Software 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 OS/2 and
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.
|Types of 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
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
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
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
|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).
|Additional Map Options|
Each type of map has a slightly different
set of additional options.
Select Additional Options to access the Additional
block, and prism maps, you can specify the pattern and color for each level,
and determine the placement and configuration of the legend.
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 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."
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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