Introduction to GIS Modeling
…an introductory course in map analysis
Exam 2 – Spatial Statistics
This exam is a 2.0 hour, closed book/notes affair taken over the Internet (honor system)
at your convenience—You will download the exam (time/date stamped at our website)
and submit the completed document within 2.0 hours. BE SURE to save your completed
Word file before you exit to submit it!!!
Name ________________________________
Date _______________ Time started ___________ Time completed _____________
Questions on Terminology, Procedures and Basic Concepts…
Choose ONLY FIVE of the following seven questions (i.e., do not answer two; total of
100 points possible)…
1) <20 points possible>. What information is lost when you assign a single value to a
polygon (e.g., average lead concentration in well water for an entire county with
hundreds of potable wells) based on a set of field samples collected within the county?
Be sure your answer includes a brief discussion of how spatial statistics would provide a
different “view” of the same data.
Answer #1 here…
2) <20 points possible>. What is the differences among spatial “interpolation,” spatial
“extrapolation.” Be sure your answer identifies which of the two processing conditions
usually results in more accurate estimates and why.
Answer #2 here…
3) <20 points possible>. What information is provided by the 1) “arithmetic sum of the
signed residuals” and 2) “average unsigned residual” when assessing interpolation
performance (residual analysis)? Be sure your answer comments on how the residual
analysis can be used to generate a map of interpolation error.
Answer #3 here…
4) <20 points possible>. Identify and briefly discuss 1) one approach used to compare
discrete maps and 2) one approach that can be used to compare map surfaces. Be sure
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