FIELD VALUE

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FIELD VALUE A field value is a measurement taken
in the environment. There are two types 1) scalar
and 2) vector. Scalar field values are
measurements that only describe magnitude
(how much amount)
Examples temperature
pressure

elevation Vector field values are measurements
that describe both magnitude
and direction.
Examples wind
gravity Field Value Maps isotherm
temperature
isobar pressure
contour (topographic) elevation
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Field values are plotted on a map according to
the location that the measurement was taken.
Field values that are the same number are then
connected to each other to create lines of equal
value called isolines. DO NOT CROSS LINES
!!!!!!!!!! Anywhere you are on that line the
value will be the same. See page 26 (fig
2-7) Field values can change over time. See
reference table for gradient formula
Gradient change in field value
change in distance
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• What is the elevation of an area?
• Where is the steepest gradient?
• The steepest gradient occurs where the contour
  lines are drawn closest
• together.
• Where is the most gentle gradient?
• The gentle gradient is where the contour
  lines are drawn farthest apart.
• What is the gradient of the Brigitte River from
  the 200 foot contour line to
• the contour line before the Brigitte River
  meets the Newburgh River?
• Direction of Stream / River flow ?
• Streams and rivers flow from an area of high
  elevation to an area of low
• elevation. The contour lines bend towards the
  source (where it begins)
• Profile a side view that shows changes in
  elevation.
• Review book page 30
• study fig 2-9 on how to construct a profile.

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• TOPOGRAPHIC CONTOUR MAPS
• See review book page 29 Callister Quadrangle
• You must be able to answer the following !!!!!
• Name of the location
• Latitude /Longitude
• Map Scale is used to measure distance
• Map direction true north, MN magnetic
  north
• Symbols
• Benchmark (BM X) is the recorded elevation of
  that area at the time of placement.
• Depression an area on the map that represents a
  hole or valley
• symbol for
  depression comb marks
• Romano Swamp and Lerose
  Sink
• 8) Contour Interval may or not be given
  describes how much the value of
• each line
  changes

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