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GE 10 > LECTURE 5 > Flashcards

LECTURE 5 Flashcards

1
Q

angle measured in the
vertical plane

A

zenith angle

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2
Q

angle measured from the
horizontal

A

vertical angle

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3
Q

Fixed line of reference for
determining direction of lines

A

meridian

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4
Q

north-south line passing through the geographic poles of the earth

A

true meridian

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5
Q

meridian that lies parallel to the
magnetic lines of force of the earth and
is indicated by the direction of the
magnetized needle

A

magnetic meridian

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6
Q

line parallel to the central true meridian

A

grid meridian

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7
Q

meridian arbitrarily chosen for convenience

A

assumed meridian

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8
Q

Units for measuring angles

A
  1. Degree
  2. Grad
  3. Radians
  4. Mil
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9
Q

Sexagesimal system is used

A

DMS

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10
Q

the angle subtended at the center of a
circle by an arc length

A

Radians

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11
Q

Sometimes referred as the
natural angle

A

Radians

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12
Q

Commonly used in military operations as in
fire direction of artillery units

A

Mil

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13
Q

Direction of any line with respect to
a given meridian

A

Bearing

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14
Q

Direction as given by the angle between the meridian & the line measured in a clockwise direction

A

Azimuth

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15
Q

Angle between adjacent lines inside a polygon

A

Interior angle

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16
Q

Angle between the line and the prolongation of the preceding line

A

Deflection angle

17
Q

Measured clockwise from the preceding line to the following line

A

Angle to the right

18
Q

Instruments for Angle
Measurement

A
  1. Tape
  2. Magnetic Compass
  3. Engineer’s Transit
  4. Theodolite
  5. Total Station
19
Q

The angle between the true meridian
and the magnetic meridian

A

Magnetic declination

20
Q

variation of magnetic declination in which the magnetic meridian swings in one direction for 150 yrs until it gradually comes to rest and then swings in the other direction

A

Secular variation

21
Q

small annual swing distinct from secular variation; the value is less than a minute

A

Annual variation

22
Q

Periodic swing of the magnetic
needle occurring each day

A

Daily Variation

23
Q

Magnetic declination variation due to magnetic storms and disturbances caused by solar flares

A

Irregular variation

GE 10 (6 decks)

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