Intro to Toppgraphic Maps (6)

Latitude —

Measured north or south of the equator (parallel or the equator and each other)

Longitude I

Measured east or west of the prime-meridian (converge towards the poles)

Magnetic Dec.

Ex: 12^o E 1950

What are the minimum and maximum values of latitude?

Min: 0 Max: 90^o

What awe the minimum and maximum values for longitude?

Min: 0 Max: 180^o

Degrees, Minutes, & Seconds

29^o (degrees) 45’ (minutes) 36’’ (seconds) N

*Convert from DMS to DD

29 + 45/60 + 36/3600 =29.76 29.76 N

Representative Fractional Scale

R.F. 1:24,000 = 1/24,000

Verbal Scale

We know that there are 12 inches in 1 foot so:

24,000 inches (R.F.) x 1 ft/ 12 in = 2,000 ft

If you measure distance between 2 points on map to be 8.5 cm. How many meters in real world?

8.5 × 24,000 = 204,000

204,000 ft x 1/100 = 2,040 meters

What is the magnetic declination on map?

12.5^o E 1950

What is the contour interval of the map?

10 ft

What is the approximate total relief of the map?

Highest elevation - lowest elevation = TR

3760 - 3420 = 340