Chapter 10: Preprocessing I (pages: 291-313)

 

 

  1. Preprocessing can be generalized into three groups of operations, name these three groups:
  2. What are the three methods of resampling uncorrected pixel data?  How does each work?
  3. What are four good examples of a Ground Control Point(GCP)?
  4. What is a simple way to create a Mercator projection? What is the difference between Mercator, Transverse Mercator and Oblique Mercator?
  5. What are the definitions of intensity, hue and saturation?

 

 

  1. What are the three main categories of preprocessing?
  2. What three strategies are commonly employed when attempting to do a geometric correction by resampling?
  3. What type of preprocessing is a principle componant analysis and what is its purpose?
  4. What type of preprocessing is image restoration and what is its purpose?
  5. What are the two main procedures used when attempting to destripe an image?

 

 

 

Field Guide: Image Rectification (pages: 339-369)

 

 

1.      Explain the differences between rectification, georeferencing, and orthorectification.

2.      List 4 reasons when rectification is necessary.

3.      What is the minimum number of GCP's needed to rectify an image?

4.      How does triangulation, or rubber-sheeting, simplify the rectification process?

5.      Define RMS Error, and why is it important in rectification?

 

 

1.      What is rectification?  When is it necessary?  When is it not necessary?

2.      What are GCP's?  According to the field guide, they consist of two pairs of  X,Y coordinates, what are the pairs of coordinates called and what is their purpose?

3.      Match the appropriate properties to the correct transformation order.

First-order transformation -

Second-order or higher transformation -

a)      used to convert Lat/Lon data to a planar projection

b)      used when rectifying  relatively small image areas

c)      used to project raw imagery to a planar map projection

d)      used for data covering a large area

e)      are nonlinear transformations that can correct nonlinear distortions

f)        used for data that are already projected onto a plane

g)      used with distorted data

4.      What are residuals?

5.      We have been exposed to resampling methods in our labs. What do resampling methods accomplish and what are the three methods mentioned in the field guide?