Geography Reference
In-Depth Information
A transverse Mercator projection show-
ing the location (A) for calculating the scale factor
example (image scaled from original).
The units in the equation must be equal, so you first need to convert
kilometers to centimeters by multiplying by 100,000.
1,107.04 km
×
100,000 = 110,704,000 cm
Calculate the local map scale:
Map scale = 110,704,000 cm/3.1 cm
Map scale = 1:35,710,967.74
This map scale is considerably larger than the map scale along the standard
line of 1:30,000,000. You can now compute the scale factor using the scale
factor equation:
Scale factor =
35,710,967.74
scane nacnor =
30,000,000
Scale factor = 1.19
This scale factor suggests that the distances in the transverse Mercator pro-
jection increase away from the central meridian. A visual check of the pro-
jected map supports this.
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