| 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. ![[cautionend]](../common/images/cautend.gif)
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
![[IMAGE]](./images/01319231.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
![[IMAGE]](./images/01319232.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
![[IMAGE]](./images/01319233.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
![[IMAGE]](./images/01319234.gif)
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).
- 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.
- When you select Enter number of levels
(1-12), you enter a whole number from 1 to 12; SAS/ASSIST software
divides the analysis column into that number of ranges.
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.
Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
