WETMAAP Skill 2
Avery and Weeks Islands: Element 2
Skill 2: Scale Determination
Element 2: Determining
Scale of 1995 Aerial Photograph
1963/80 Delcambre Topographic Quadrangle
1995 Avery Island Aerial Photograph
9" x 9" clear film overlay
color marker pens
ultra fine black marker pen
ruler
drafting tape
calculator
Reference Manual
1. Tape the 9" x 9"
clear film overlay on top of the 1995 aerial photography.
Hint: The fiducial is a yellow dot or cross-hair along each of the four sides of the aerial photography.
5. Identify two
points on the 1:24,000 scale topographic map at least four inches apart.
Hint: It is best to identify and use cultural features, but if not enough are available, use two natural feature points that do not appear to have changed.
_________________ What
is the distance in inches?
9.
Using the calculator and "Scale
Determination" section of the Reference Manual,
determine the scale of the aerial photograph.