Geographical Information Systems
Exam 2, Fall 2004
answer 3 @
Longer answer 2 @
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.
of your answers is important. For full credit you
should use correct terminology, and show that you understand the
define 10 of these terms with a concise sentence that clearly
shows your understanding of the term: Each is worth three
- Metonic cycle:
- stereo imagery
Answer 3 of the following 5 short answer questions.
Each is worth 10 points.
- What are the major steps required to
create a digital vector data set with the roads from a
paper AAA road map?
- Why does NGA use Lat/long for all of
its digital data, including DEMs?
- The map below is not very
geographically correct. Would it be better to use a
real projection like the Mercator to display the
- Why does making maps required a skilled
cartographer, and does GIS remove the need for those
- Compare the advantages of a TIN or a
Answer 2 of the following 3 Longer answer
Each is worth 20 points, and you should have
a sufficiently detailed answer to show you understand the
- Why would a vector data set with roads,
streams, and other layers be a better choice than a
raster data set created by scanning a paper map which has
all the same data? Would the raster choice ever be
- In your first assignment after
graduation, you find yourself dealing with spy satellite
data to plan operations. The first data arrives,
and the image is largely red. Despite good detail
in the image, your boss is ready to wring your neck
because the data looks worthless to him because of the
color. Can you explain what might account for the
false color in the imagery, and whether it could actually
help you accomplish your mission?
- We have talked about both vertical and
horizontal datums, and datum shifts. Differentiate
the two and explain why users in the real world have to
care about what seems like very theoretical aspects of