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Blue water, lakes, rivers, streams, etc. The names of bodies of water and water courses are also shown in blue, as are magnetic declination and UTM (Universal Transverse Mercator) grid information.
Brown - contour lines, contour elevations, spot elevations, sand.
Green - areas with substantial vegetation like a forest, orchard, or vineyard
Grey - used on
back of
map where
different symbols and a glossary of terms and abbreviations can be found.
Orange - unpaved roads and unclassified roads and streets.
Purple - features added to
map since
original survey. These features are based on aerial photographs but have not been checked on land.
Red - major highways; boundaries of public land areas. A red tint is used to show an urban development.
White - areas with little or no vegetation; also used to depict permanent snowfields and glaciers
Topographic Maps Glossary
Bearing - Angular direction expressed in degrees.
Contour Lines A line on a map joining points of equal elevation. These lines are used to illustrate relief on a map.
Distortion - The difference in shape between
actual curved surface of
earth and
flat representation of a topographic map.
Grid - A system of horizontal and vertical lines that provide coordinates for locating points on an image.
Magnetic Declination - The angle between magnetic north and true north, expressed in degrees and minutes, east or west from true north.
Magnetic North - The direction your compass needle points.
Projection - A method by which
curved shape of
earth is represented on a flat surface, overcoming distortion.
Relief The variations in elevation of
earths surface.
Scale The relationship between distance on a map and
corresponding distance on
ground. For example, a map with a scale of 1:50,000 means that 1 unit of measurement on
map equals 50,000 equivalent units on
ground.
Topographic Map An illustration of
earths different elevation levels by means of contour lines. They present both natural and manmade features.
True North - Direction of
northern rotational axis of
earth
North Pole.

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