Midterm Exam

AWER 4930, Geographic Information Sytems

due Oct 31 2003

Instructions: Answer all questions, for a total of 100 points. Post the answers to your webpage. Make sure that the file is in your public_html directory, under the name of midterm.html. If you work in groups, please post the names of your collaborators on your webpage.

I have written a script that will print everybody's webpage at midnight, Oct 31, 2003.

(20 points) Place a map of your burncover that you digitized in lab on your webpage. Include roads and contours of the mountains around it, and make sure that you have a north arrow ans scale bar on the map.
(10 points) What are the UTM coordinates of the furtherest north, furtherest south, and furtherest east points of the burned area?
(20 points) What are the UTM coordinates of the top of the A on Old Main? (hint: sht_76.jpg)
(5 points) You have used the PROJECT command in ARC/INFO to convert the information in a coverage from lat-lon to UTM projection. If you look on the lab page, you were required to supply a certain number of parameters in a sort of a script, with some required arguments.
1. If you now wish to convert your UTM coverage to stateplane, what are the required arguments that you would need to give to the script?
2. What are the Lattitude and Longitude of the furtherest north, furtherest south, and furtherest east points of the burned area?
(10 points) In the directory /home/gisclass/midterm there is a file called rangesites.e00.gz.
1. According to the file extensions, what kind of a file is this?
2. What kind of file is it really?
3. What happens if you try to unzip it and import it into ARC/INFO?
4. Import the coverage, and show a picture of the data set on a map of the counties of northern Utah.
5. In what counties are the four corners of the data set?
(5 points)
1. What does the REGIONPOLY command do in ARC/INFO?
2. So, what is a REGION, and how is that different from a polygon?
(5 points)
1. Consider the following Arc Attribute Table (AAT), which contains topological information from a small river network. If a contaminant were to spill somewhere along arc g, which arcs would be contaminated as the spill washes downstream?
  
  arc length from-node to-node
  
  a 3 1
  
  b 2 3
  
  c 4 3
  
  d 5 4
  
  e 6 4
  
  f 7 6
  
  g 8 6
  
  h 10 8
  
  i 9 8
2. Draw a topologically correct map of the river network described in question 7a. Which node is the outlet?
(5 points) Define lossless and lossy compression. Why is this important for raster images?
(10 points) Consider the following data stream: it is a row-order, run-length encoded representation of a binary raster image (colors BW, or black/white). Assume that the header information starts you in the upper left hand side (northwest corner), and specified a grid as given below. Draw the image depicted by the data stream.
(37,W), (1,B), (14,W), (1,B), (13,W), (3,B), (12,W), (3,B), (11,W), (5,B), (9,W), (7,B), (8,W), (3,B), (1,W), (3,B), (9,W), (1,B), (3,W), (1,B), (65,W)

$\epsfig{file=grid1.eps, width=\linewidth}$
(5 points) Open the project /home/gisclass/midterm/proj3.apr, and open the window to View 4.
1. Which are the point themes?
2. Which are the line themes?
3. Which are the polygon themes?
4. Which are the raster themes?
5. Which are the images?
6. How many shapefiles are there in this view?
(5 points) If you have a raster coverage of 40 meter resolution, and you have a landcover type that occupies 70 pixels, what is the total area of that landcover type in your dataset?

About this document ...

Midterm Exam

This document was generated using the LaTeX2HTML translator Version 2K.1beta (1.47)

The command line arguments were:
latex2html -split 0 -local_icons midterm

The translation was initiated by paul box on 2002-09-30

paul box 2002-09-30

arc	length	from-node	to-node
a		3	1
b		2	3
c		4	3
d		5	4
e		6	4
f		7	6
g		8	6
h		10	8
i		9	8