Tuesday, October 5, 2010

Reading Topograpihc Maps

1. The name of the quadrangle is the "Beverly Hills Quadrangle."

2. There are eight adjacent quadrangles.  1) Canoga Park  2) Van Nuys  3) Burbank  4) Topanga  5)    Hollywood  6) N/A  7) Venice  8) Inglewood 

3. The quadrangle was created in 1995.

4. There are two datums for horizontal, and one for vertical.  The two for horizontal are The North American Datum of 1927 as well as the North American Datum of 1983.  The datum for the vertical is The National Geodetic Vertical Datum of 1929.

5. The scale is 1:24,000.

6. a) 5 centimeters is equivalent to 1,200 meters because 5x24,000= 120,000 cms which converts to 1,200m
    b) 5 inches is equivalent to 1.89 miles because 5x24,000= 120,000in which converts to 10,000ft. 1mi=5280ft so 10,000/5280=1.89 thus 5in equals 1.89 miles.
    c) 1 mile equals 2.64 inches on the map because 1mi=5280ft x 12in=63360in, thus 63360in/24000scale= 2.64 in
    d) 3 kilometers equals 12.5 cms on the map. 3km= 3000m. 3000/24000= .125m= 12.5cm

7. The contour interval on the map is 20 feet.

8. a) Latitude is Y x7.5'. Y= 3.50mi/8.60mi = .407. Thus .407x7.5'= 3.0525'. Thus the latitude is 34 07' 30" - 3' 3"= 34 04' 27" or 34.074.  For Longitude, Y= 3.7mi/7.2mi= .514. Thus .514x7.5'= 3.855'.  Thus the longitude is 118 22' 30"+ 3' 51"= 118 26' 21" or 118.4391.
34.074N, -118.4391W or 34 04' 27"N, -118 26' 21"W

    b) Y=8.1/8.6= .942.  .942x7.5' = 7.064'.  34 07' 30"- 7'4"= 34 0' 26" or 34.0072
        Y= 7.18/7.2= .9976.  .9976x7.5'= 7.482.  118 22' 30" + 7' 29" = 118 29' 59" or 118.49972
34.0072N, -118.49972W or 34 0' 26"N, 118 29' 59"W      

    c) Y=.34/8.6= .040.  .04x7.5'= .3'.  34 07' 30" - 20" = 34 07' 10" or 34.1194
        Y= 2.0/7.2= .2778.  .2778x7.5' = 2.0835'.  118 22' 30" + 2' 05" = 118 24' 35" or 118.4097
34.1194N, -118.4097W or 34 07' 10"N, -118 24' 35"W

9. a) 560'
    b) 140'
    c) 620'

10. This map uses UTM zone 11

11. (3)61.5 Easting and (37)63 Northing

12.  1000m x 1000m= 1,000,000 m^2

13.

14. The magnetic declination of the map is 14 degrees east.

15. The water is flowing south.

16.

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