SO432, Geographical Information Systems

Exam 2, Fall 2003


Definitions    10 @  3        30   ___________

Short answer    3 @ 10        30   ___________

Longer answer   2 @ 20        40   ___________

Total                        100   ___________


Read the directions carefully.  You have a selection of questions for all parts of the exam.  Carefully select which questions you will answer, and only answer the correct number of questions.


Quality of your answers is important.   For full credit you should use correct terminology, and show that you understand the concepts involved.


The comments in red are not complete answers, but key points that you should have considered and were missed by a number of students.


Definitionsdefine 10 of the 12 terms with a concise sentence that clearly shows your understanding of the term:  Each is worth three points.


  1. ETOPO5  global 5’ DEM
  2. generalization
  3. GUI
  4. input goes with analysis and output
  5. LIDAR
  6. registration – with digitizing and imagery both
  7. soft-copy
  8. SRTM  1” DOD, and 3” and 30” for everyone
  9. stereo imagery  two separate images
  10. TIN
  11. topology

Answer 3 of the following 5 short answer questions.  Each is worth 10 points. 

  1. What is required to digitize a vector data set?


Registration and attribute encoding


  1. What are the tradeoffs in selecting Lat/long or UTM as the grid for a DEM?


When equating seconds to meters or km, always say about 1” = 30 m.  Emphasize about.


  1. How can we use image statistics to perform a supervised classification of a satellite scene?

 24/29 skipped question

  1. What is required for 3D visualization of a satellite scene?



DEM and registered satellite image or 2 separate images.



  1. Is contouring easier with a TIN or a gridded DEM?

Answer 2 of the following 3 Longer answer questions.  Each is worth 20 points.


  1. What are the different kinds of resolution we discuss for satellite remote sensing, and how would they affect the design of a spy satellite?


  1. Discuss the advantages of vector GIS data compared to raster data.


  1. Defend or attack the assertion that a DEM is the single most important type of data for military GIS work.