SIE 509 – Principles of GIS
Test 2 – Fall 2013
KEY
Scoring is based on 102 Points
1.
Geoocode (assign an x,y coordinate) for the address 35 Poplar Street. Show your work. (8
Points)
Chain_ID
From
Node
103
Node_ID
X_Coord
Y_Coord
92
100
150
93
100
56.
To Node
92
Name
From
From
To
To
Add_Right
Add_Left
Add_Right
Add_Left
2
3
40
39
93 Poplar St.
100,150
3
5
100,56
7
39  3
 1  19
2
9
11
13
15
150 - 56 94

19
19
17
19 21
23
17 
25
27
94
 84.1
19
29
31
33
35
37 39
150 - 84  66
So the coordinates are 100, 66
2.
a.
What are the key problems when using GIS to model spatial processes? (4 Points)
The quality of the data used.
The implementation of the model within the GIS.
The availability of data for model validation.
Matching model complexity with process complexity.
b.
What are the key problems when using GIS to model human spatial processes? (4
Points)
It is very difficult to know how people make decisions.
Most of the existing models are based on transportation models for moving freight, which is not
a good predictor of human behavior.
3.
Describe the important steps in developing a multi-criteria evaluation model? (6 Points)
MCE is a method of combining data according to their importance in making a given
decision.
Define a problem
Select criteria
Allocation of weights.
Application of the MCE algorithm.
Standardization of criterion scores.
Selection of criteria.
4.
When data are aggregated many problems or issues may emerge (3 Points Each)
a.
What is the Modifiable Unit Problem?
Attributes for any polygonal area depend on the size, shape, and location of the
polygon. This means by changing the size or shape of the polygon, we may get
substantially different aggregate values, e.g., the average population density, the
percentage in one political party, or the proportion of people in poverty may change
considerably when we adjust the boundaries of a polygon.
b.
Explain the zoning effect.
Aggregate statistics may change by changing the boundaries of a unit.
c.
Explain the size effect.
Aggregate statistics may change by changing the size of a unit.
5.
Discuss the issues involved in data quality (8 Points)
Errors
Accuracy
Precision
Resolution
Bias
Uncertainty
Completeness, compatibility, consistency and applicability for the project
6.
Identify 5 key component of a layout. (5 Points)
Title
Data frame with map
Legend
Scale
North Arrow
Source
Projection
The following problems should be addressed using ArcMap, and the data available on the class website
(http://umaine.edu/computingcoursesonline/sie509/Lab Exercises). Please outline the steps you took
to arrive at your answers, as this is the only way I can give partial credit if your answer is not correct.
For items 7 – 11 use the data in the Freeport folder. The data in this folder does not have a defined
projection, but it was collected in NAD 83 State Plane Maine West (U.S. Feet).
RESIDENTIAL parcels are defined as RETYPE = 1.
ADDITION = Y are parcels with an addition to the building.
POOL = Y are parcels with pools.
AUXGAR is an unattached garage and ATTGAR is an attached garage.
7.
How many acres are owned by BEAN L L INC'? (4 Points)
727
8.
How many residences have an addition and a pool. (6 Points)
42
9.
How many residences have a garage? (6 Points)
1149
10.
How many residences are within 2000 feet of a hydrant? (8 Points)
Answers may vary depending upon the approach taken, but using the most liberal
interpretation
The most liberal interpretation: Residential parcels within a distance of 2000 feet of a
hydrant; to the most restrictive: Residential parcels completely within the 2000 foot
range, I got values of 668-778.
11.
How many residences are more than 2000 feet from a hydrant? (8 Points)
2462 minus the above answer.
For items 12-14 use the DEM folder and open the Towers.mxd.
12.
Create a slope grid in degrees. Using 6 classes and Natural Breaks, in what range is the most
frequent slope? (4 Points)
0 to 2.516455826
12.
Create an aspect grid with symbology for Flat, N, NE, E, SE, S, SW, W, NW. What is the most
frequent aspect? (4 Points)
The answer varied based upon what you used to evaluate the question. The distribution
below suggests that it is between 180 to 270 which would be southwest.
The histogram clearly shows it to be south. Either answer was accepted.
14.
Which potential tower provides the best coverage of the area represented by the DEM? (8
Points)
Tower
Visible Cells
Based on Viewsheds:
1
55743
2
597
3
21324
4
2093
5
3356
Forr item 15, use the Me_Regions folder.
You will need the BiophysicalRegions which delineates the biophysical regions of Maine. The file was
downloaded from the Maine Office of GIS. Your task is to determine the acerage for each biophysical
region in Maine, and to attach a screenshot of the attribute table with that information. (12 Points)
Dissolve the regions based on name.
Add a field
Calculate geometry