Environmental Geology Lab

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16 terms

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.

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