303
Fall CEE/GLE/IES 2004
Name ______________________________________________________
CEE/GLE/IES 303 Fall 2004 Final Exam Answer all questions on these sheets. This is a closed book exam. You may not use any other resources except a calculator to answer these questions. Please enter your name at the top of this page.
1. 6 Points 2. 14 Points 3. 20 Points 4. 15 Points 5. 15 Points 6. 15 Points 7. 15 Points Total Lab Grade:
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Course Grade:
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CEE/GLE/IES 303
Fall 2004
1.
6 Points Define/explain the following terms or abbreviations (as discussed in class): A) ISODATA
B)
Histogram Equalized Stretch
C)
LUT
CEE/GLE/IES 303
Fall 2004
2.
14 Points a) Explain bi-linear interpolation. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ b) Two images of the same area on the ground are depicted below. The one on the right is a rotated version of the image on the left. Explain why there is such a stair step appearance on the right image that is the edge of the horizontal road shown on the left image.
____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________
CEE/GLE/IES 303
Fall 2004
3.
20 Points Below is a confusion matrix constructed from a supervised classification for the images you used in the laboratory exercise. Answer the questions below using this confusion matrix and your experiences in the laboratory.
0 0 0 0 0 0 0 0 0 0 1 0 75 0 0 0 0 0 0 75 Class Numbers 2 3 4 5 0 0 0 0 0 0 0 0 72 0 3 1 0 75 0 0 2 0 53 1 0 0 19 73 0 0 0 0 1 0 0 0 75 75 75 75 Class Totals 6 0 0 3 0 1 17 48 6 75 7 0 0 1 0 0 0 1 73 75 0 75 80 75 57 109 49 80 525
Unclassified Water Deciduous Trees Evergreen Trees Corn Alfalfa Other vegetation Impervious Reference Totals
a) What is the overall accuracy for this classification? __________________ b) What is the Producer's accuracy for Corn? _ c) What is the User's accuracy for Alfalfa? ___________________ d) On the scatter plot below for this classification, indicate the relative locations and extent for the three classes: Corn, Alfalfa, and Other Vegetation. Be sure to indicate the bands on the axes. The scales on the axes are not necessary. __________________
e) Explain on the next page how you would change the above scatter plot, using the information in the confusion matrix to improve the accuracy. f) What is K-Hat and how is it calculated? Calculate or estimate (from your lab experience) the value for K-hat for this confusion matrix. Please answer this question on the next page.
CEE/GLE/IES 303
Fall 2004
3.
(continued) Answer for problem 3, part e.
Answer for problem 3, part f.
CEE/GLE/IES 303
Fall 2004
4.
15 Points a) Two similar algorithms were discussed in class to allow merging higher resolution panchromatic bands with lower resolution multi-spectral bands. These algorithms are called: ____________________ and ________________________ b) What is the major benefit of using these algorithms? ________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ c) To demonstrate that you understand how the algorithms work, calculate the transformed values (using either algorithm) for the pixel described below, assuming the sensitivity of the panchromatic band is equal for all of the multi-spectral bands. Ikonos Image Band Value 1 40 2 62 3 36 4 110 Pan 70 Merged Image Band Value ______ _______ ______ _______ ______ _______ ______ _______ ______ _______
CEE/GLE/IES 303
Fall 2004
5.
15 Points Below is a Vegetation Index (NDVI) image derived from a SPOT scene.
a)
What are the uses for a Vegetation Index image? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________
b)
Which band from a Tasseled Cap Transformation is most similar to the scene pictured above? ___________________________________________________
c)
How does atmospheric scattering affect the use of a Vegetation Index and what have been the methods of resolving these problems? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________
CEE/GLE/IES 303
Fall 2004
6.
15 Points a) What is a Principal Components Transformation (PC)? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ b) Give at least two good reasons to use such a transformation: _____________________________________________________________ _____________________________________________________________ c) What distinguishes the first Principal Component band from the th...