Topographic Maps Notes
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Lab questions: Activity 2, skip B, F2, F5 and G, pg. 199. Activity 3, pg. 201. Activity 5, pg. 205. Activity 6, pg. 206.
Coordinate systems (where am I?):
Latitude: the lines that run ______ and _______ across a map.
 Latitude numbers run from zero (the equator) to _____ (the poles).
 The addition of a N (North) or S (South) indicates which hemisphere you are in.
Longitude: the lines that run ______ and _______ across a map.
 Longitude numbers run from zero (the Prime Meridian) to ______ (the International Date Line).
 The addition of an E to the numbers indicates you are in the Eastern Hemisphere and a W means you are West of the Prime Meridian.
 One degree can be divided into _____ minutes. One minute is _____ seconds.
Quadrangle: The standard size USGS (US Geologic Survey) Map.
 Covers a square area of 7.5 minutes in latitude by 7.5 minutes in longitude.
 Why aren't our maps in this area __________?
Reading Topo Maps (which way do I go?):
Contour Lines: Lines that connect points of _______ elevation
Sea Level: the ____________ contour line.
Index Contour: The _________ contour lines on a map
Contour Interval: How much the elevation jumps between two ___________ contour lines
Hills: are located in the the center of a bull’s eye of __________
Depressions: where the ground slopes downward. Indicated by __________ marks (whiskers) on the contour lines.
 The lowest point in a depression is half way inbetween the contour and the _________ contour line down if it had been there.
Magnetic Declination the difference between true north and where the _________ points!
Stream flow directions: the stream flows ______________ the point in the “V” of the contour that crosses over it.
Gradient (Slope) is calculated by dividing the difference in elevation between to points by its _____________.
(mathyouneed)
Map Scales (are we there yet?):
Fractional: a fraction that indicates how the comparative ratio between one unit on the _____ (say an inch) is equivalent to how many of the same units (inches) in real life on the _________.
 ex. 1a. 1/63,360 or 1:63,360 means one inch on the map is really ___________ inches on the ground.
 b. How many feet apart are 2 spots that are 4 inches apart on the same map as above? _______
Graphic: because you really don’t know instinctually how far 63,360 inches really is  a _________ bar scale is provided for you.
 Note: begin measuring distances from ____________!!!
Verbal: indicating the number of inches (on the map) in ______ mile (on the ground).
 To convert inches to miles divide the total inches by _________ to get the number of feet per mile, then divide by _____ to get the number of inches in a mile.
Map Reading Challenges:
Topographic Profile: a _______ section of a map that shows the elevation and slope along a given line.
Vertical Exaggeration: The number of times the _________ scale is greater than the _________ scale. Found by dividing the horizontal fraction scale per _______ by the vertical exaggeration scale per _______.
 To calculate find out how many inches on the ground is equivalent to one inch on the map.
 ex. 1:11,520 would be ___________
 Divide this number by how many inches are indicated in a one inch rise on your vertical profile scale. Use a ruler.
 ex. If you made a scale whereby one inch equals 120 feet then the equivalent number of inches in real life would be 120 x ________ = 1440 inches.
 In the above example the vertical exaggeration would be 11,520 divided by _________ or 8 x.
Regional (Maximum) Relief: The difference between the highest and the __________ points on a map (or the fact that you are done with notes!).
