I. Interpretation CluesFor each of the photos below, identify the feature(s) indicated on the photo, and describe the visual clues you used to identify or distinguish the feature(s). Be sure to use the items discussed in lecture and Avery and Berlin: tone, texture, shadow, pattern, association, shape, size, and site. Most of the photos have an adjacent photo with overlap, so that you can use your stereoscope to get a better look.
1. Photo A
2. Photo B
3. Photo C
4. Photo D
5. Photo E
6. Photo F
II. Air Photo and Map Interpretation
This part of the exercise involves combining topographic maps and air photos to describe and interpret features in a landscape. Provided is a set of six 7.5 minute USGS topographic maps and a set of 12 air photos. I suggest that you work in groups of three or four, for the first part of this exercise.
1. As a group, on the big table lay out the maps in their proper order, then lay out the air photos so that they correspond with the area shown on the maps. (The maps will take up more room than the table can accommodate, so you will have to overlap them somewhat, then bring to the top successively the ones you want to look at.
a. What is the area covered by the maps?
b. What is the area covered by the air photos?
c. When were the air photos taken? How does this compare with when the maps were made? What can this tell you about the area covered?
d. What time of year were the air photos taken? How does this influence what you see? Could you deduce time of year from clues on the air photos?
e. Can you tell what time of day the photo was taken? Explain.
2. Each person should take two or three of the photos that are adjacent (successive frame numbers) to do some more detailed description on their own.
a. What are your flight and frame numbers (give the complete number, e.g. 1-26)?
b. Use the fiducial marks to find the Principal Point on the southernmost of your air photo set. DO NOT MARK on the air photo. Find this point on the topo map. What are the UTM coordinates for this point?
c. Look at the stereo area covered on your photos. Describe in detail both cultural and physical features you can see on the photos. How does the map help you with your interpretation?
d. What can you see on the photos that isn't on the map(s)? Explain why each feature or characteristic is not shown on the map.