quiz 17
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School
University of North Carolina, Charlotte *
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Course
3120
Subject
Geography
Date
Dec 6, 2023
Type
docx
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Uploaded by GrandMink3802
GEOG 3120
QUIZ 17 (4 points)
Due: Nov 8, 2:30 PM
INVERSE DISTANCE WEIGHTED INTERPOLATION
Name: Ava Oljeski
Fine particulate matter (PM
2.5
) is an air pollutant that is a concern for people's health when
levels in air are high. PM
2.5
are
tiny particles in the air that reduce visibility and cause the air to
appear hazy when levels are elevated. The
primary source of PM
2.5
emissions comes from
car,
truck, bus, and off-road vehicle exhausts. The chancellor of the university wants to know the
distribution of
PM
2.5
emissions on campus during afternoon peak hours when traffic is heavy on
campus. After hiring some consultants to take measurements, the chancellor has tasked you
with making a surface map of
PM
2.5
emissions on campus. Measurements are in
μg/m
3
for a 24-
hour period. You decide to use IDW to perform your interpolation:
z
j
=
∑
i
=
1
n
(
z
i
d
ij
p
)
∑
i
=
1
n
(
1
d
ij
p
)
Assume
p
= 1 and use all control points (red) within 0.3 mile of your prediction point (gray). The
study area is 1x1mile and each grid cell is therefore 0.2x0.2 mile. I.e., use control points in all
first order neighbor cells for your prediction (vertical/horizonal neighbors = 0.2 miles away,
diagonal neighbors = 0.28 miles away).
186.43/15.71=11.86
GEOG 3120
QUIZ 17 (4 points)
Due: Nov 8, 2:30 PM
Interpolated grid/map (fill in):
20
14.5
21
11.86
8
16
5
15
11
9
11
20
Please address the following questions and turn it in together with your interpolated map:
1.
Describe your findings for the chancellor. In which areas of campus are pollution levels
higher vs. lower? Higher=p3
2.
Describe to the chancellor how your surface map could be improved. Specifically, how
would the following affect the accuracy of your resulting surface map: (i) more control
points, (ii) use of a finer grid (i.e., divide the area into more grid cells)?
More points=more detail
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