WETMAAP Skill 3
Texas City/Virginia Point: Element 4

Skill 3: Scale Determination
Element 4: Comparison of Topographic Quadrangles

Materials:

1954/1974 1:24,000 scale 1994 USGS Virginia Point Topographic Quadrangle

1994 1:24,000 scale 1994 USGS Virginia Point Topographic Quadrangle

ruler

Exercise:

1. Lay the 1954/1974 Virginia Point Topographic Quadrangle and the 1994 Virginia Point Topographic Quadrangle in front of you.

2. The 1954 Topographic map was updated with the 1974 aerial photography. How are the differences in features between the two dates shown the map?

3. Were the changes shown between 1954 and 1974 land gain or land loss?

4. Recognize the differences between 1974 and 1994:

a) in oil storage tanks

b) in man-made water storage/treatment lagoons

c) along the shoreline

d) in Snake Island/Shoal Point