an isopleth map shows an imaginary surface by means of lines joining points of equal value, "isolines" (e.g. contours on a topographic map) ...
isogonic chart Chart showing isogonic lines properly labeled with their magnetic declination. isogonic line Line joining points on the Earth's surface having equal magnetic declination as of a given date. isopleth map See: map, isopleth ...
 See also: Information, Symbol, Class, Projection, Map
  
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