Chapter 10 Compass and map vocab Flashcards
What is an imaginary line connecting points; shows 0° of magnetic declination at a given date
Agonic line
What line shows elevation on a map?
Contour lines
What is a starting point of a scale called?
What is a level surface to which heights are referred
What is used as a reference for position?
Datum, vertical datum, horizontal datum
A network of uniformly spaced parallel lines intersecting at right angles on a map:
Grid
A line joining points having equal magnetic dec. as of a given date:
Isogonic Line
Angular distance in degrees, minutes, or seconds, of a point north or south of the equator: (x)
Latitude
Angular distance of a point east or west of the Greenwich Meridian: (y)
Longitude
The difference between magnetic north and true north:
Mag dec
A circle from pole to pole around the earth:
Which is a 0° line that passes through Greenwich England; also the origin of longitude
Meridian
Prime meridian
Four sides area bounded by parallels of latitude
Quadrangle
Elevations and depressions of the land
Relief
A one square mile quadrangle that is a unit of subdivision of a township:
Section
Difference of size from a map- to real life
Scale
Visual geographic relief of a land surface via contour lines. A specific type of map:
Topography
The direction of an object measured in degrees from north (three words)
Bearing, heading, azimuth
180 degree opposite of a bearing
Back azimuth
4 principle points of a compass: N, S, E, W
Cardinal points
Plan of travel using a compass, map, or both:
Course
Relative location of one terrain feature to another, described as points of a compass instead of degrees: (cardinal points, and intercardinal points)
Direction
North established by the vertical UTM grid lines on a map:
Grid north
Points between cardinal points: NW NE SE SW
Intercardinal points
The direction to which the compass arrow points:
Magnetic North
Process of determining ones location in the field with the help of landscape features, map, compass, or all three; making the north on the map, match up with north on the compass
Orientation
A line from any position on the earth’s surface to the North Pole
True north
