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27 terms

Topographic Maps/Field Maps

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relief
difference in elevation between highest and lowest points
elevation
height above mean sea level
contour lines
lines that connect point of equal elevation
index contour
every fifth contour is darker and labeled by elevation
legend
key to map symbols
magnetic north
direction of magnetic north pole (what the compass points to)
true north
direction of geographic north pole
magnetic declination
difference between true north and magnetic north
contours that cross a stream
form a "v" shape and flows towards the open part of the "v"
concentric circles
shows a hill
Representative Scale (R.F. or scale)
how many times the map has been reduced,ie 1:1,000,000
isotherm
lines that connect points of equal temperature
isobar
lines that connect points of equal pressure
polyconic projection
map projection use to draw topographic maps
latitude
distance in degrees north and south of the Equator
longitude
distance in degrees east and west of the Prime Merdian
depression contour
use to show craters and hollows on a map
bench mark
places where exact elevations are shown on permentant plates
USGS
United States Geological Survey. Responsible for making topographic maps and other maps
7.5 minute quadrangle
USGS map series
gradient
slope or how steep the land is
level land
shown by contour lines far apart
steep land
shown by contour lines close together
profile
shows elevation changes across a map section
remote sensing
methods include Landsat and imaging radar
field map
map where a physical feature is measured
contour interval
difference in elevation between one contour line and the next contour line (vertical distance)