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SNMAP is very similar to SFMAP. The only fundamental difference is that SNMAP will map sounding (upper air) data instead of surface data. As a result, you must define the level and vertical coordinate on which to map the data.
We will practice using this program in the end of the chapter exercises.
GDMAP
GDMAP is very similar to SFMAP and
SNMAP. The only fundamental difference is that GDMAP will plot gridded data
points on a map. Usually, however, we use contours, streamlines, or vectors
to view gridded data, so this program is of limited use.
We'll discuss the new variables unique to grid programs in the
Grid Programs section. Consult the on-line
help file, or the User's Manual for information on how to use this program.
After working through this chapter, you should now be familiar with:
Before moving on to the next chapter, test your GEMPAK skill by working
through the Mapping Program Exercises.
After each question, there will be a answer window 
.
Work through the exercise, and then check your results against the answers.
The next chapter discusses graphing programs. These programs are used to represent data without the geo-referencing. Examples include meteograms and Skew T-Log P plots. Cross section programs are also included in this category.
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