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16 terms

Environmental Geology Lab

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Topo Map
a 2-dimensional representation of the 3-dimensions surface of the Earth.
Topography
refers to the landscape of that area, or the change in elevation to the surface represented by hills and valleys.
Contour Lines
Lines that connect points of equal elevation.
Contour Interval
Elevation difference between 2 successive contour lines.
Index Contour
Every 5th contour line--drawn as bolder lines an are labeled with their elevation.
Title
Commonly named after th major geographical feature within the map area.
Orientation
most commonly displays north at the top of the page.
Geographic North
North pole is the northern end of the Earth's rotational axis
Magnetic North
direction toward which a magnetic needle of a compass points.
Legend
is the part of the map where the explanation of the symbols used on the map are found.
Fractional Scale
means the one unit of length on the map equals how ever many units of the Earth's Surface. Example: 1:24000
Graphic Scale
a line or bar that is divided to relate distances on the Earth's Surface to distances on the map.
Lattitude
parallels, lines drawn from E to W on the sufrace of the Earth. Measurd N and S from the 0 degree reference line, or Equator, which divides earth into northern and southern hemispheres--written with N or S after numerical measurement.
Longitude
Merideans, are drawn from N to S on surface of theEarth. Measure E and W ofthe 0 degree reference line, or prime meridean--written with E or W after numerical measurement--E and W of Prime Meridean in Greenwich, England.
Townships
Grid pattern created by starting at baselines and surveying additional E and W lines.
Ranges
starting at the principal merideans and surveying additional N and S lines.