Field Survey Techniques Quiz
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Questions and Answers

What are two characteristics of field notes that ensure their integrity?

  • Recorded in the field and original (correct)
  • Photocopied and transcribed
  • Original and not erased (correct)
  • Detailed and signed

What is the corrected bearing if your FS is 192 degrees and your BS is 10 degrees?

  • 180 degrees
  • 185 degrees
  • 202 degrees
  • 191 degrees (correct)

What type of error would a mis-adjusted declination create?

  • Systematic error (correct)
  • Random error
  • Human error
  • Instrumental error

Which map scale represents a larger scale: 1:5,000 or 1:500,000?

<p>1:5,000 (B)</p> Signup and view all the answers

What do contours never do?

<p>All of the above (D)</p> Signup and view all the answers

How should you denote a forest stand that is dominantly Douglas-fir and less than 20% western red-cedar?

<p>F(C) (B)</p> Signup and view all the answers

What does an isogonic line represent?

<p>Areas of equal magnetic declination (B)</p> Signup and view all the answers

What is one of the five principles of good field notes?

<p>Clarity (B)</p> Signup and view all the answers

Flashcards

Integrity of Field Notes

Field notes should be original documents recorded in the field, free from erasures or alterations. This ensures their reliability and accuracy.

Corrected Bearing Calculation

To correct a bearing, add half of the sum of the foresight (FS) and backsight (BS) bearings to the FS bearing, then divide the sum by 2. This ensures a consistent bearing for the observed line.

Good Tie Points

Tie points are identifiable features on the ground that can be located on maps or aerial photos. They help connect field observations to the map or imagery. Examples include road junctions and GPS-located features.

Map Scale: Larger vs. Smaller

A larger scale map represents a smaller area in greater detail. A smaller scale map represents a larger area with less detail. The larger the representative fraction, the smaller the scale.

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Systematic Error: Mis-adjusted Declination

A systematic error occurs when a compass is not properly adjusted for magnetic declination. This consistently shifts your bearings, leading to incorrect measurements.

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Resetting Magnetic Declination

Magnetic declination, the difference between true north and magnetic north, changes over time. To maintain accurate bearings, you must reset your compass declination yearly to account for these shifts.

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Converting Map Distance to Field Distance

To convert a map distance to a field distance, multiply the map distance by the map scale. Keep the units consistent (e.g., cm on the map to meters in the field).

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Azimuth Conversion from Quadrant Bearing

To convert a quadrant bearing to an azimuth, subtract the degrees west of north from 360. This gives you the equivalent bearing measured clockwise from north.

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Study Notes

Field Notes Integrity

  • Field notes must be recorded directly in the field.
  • Notes are original; no copies or erasures.

Corrected Bearing Calculation

  • Calculate the corrected bearing by adding half the difference between the forward and backsight bearings to the forward sight bearing.
    • Example: If FS is 192° and BS is 10°, the corrected bearing is 191°.

Good Tie Points

  • Road junctions
  • GPS-positioned features (Control Points)
  • Easily identifiable features from photographs.

Map Scale Comparison

  • 1:5,000 is a larger scale than 1:500,000.

Systematic Error

  • Mis-adjusted declination causes a systematic error.

Magnetic North Movement

  • Reset declination annually due to magnetic north's movement.

Field Distance Calculation

  • If the map distance between points A and B is 5.0cm on a 1:1,500 scale map, the field distance is 75.0m.

Azimuth Conversion

  • Convert N 25° W to azimuth: 335°.

Compass Bezel Lines

  • Orienting lines are the parallel lines on the compass bezel.

Contour Characteristics

  • Contours never cross or split. They never end.

Forest Cover Notation

  • Forest cover notation for a stand dominantly Douglas-fir with less than 20% western red-cedar is F(C).

Point of Control (POC) Elevation

  • Given POC elevation with slope, calculate the elevation at the POC: 133.2m.

Elevation Error Calculation

  • Calculate elevation error: 4.2m.

Safety Meeting Topics

  • Hazards
  • First aid
  • Emergency response
  • Check-in procedures

Bird's Eye View Equivalent

  • Plan view.

Surveying Definition

  • Surveying is the art, science, and technology by which lines, distances, angles, and elevations are established and measured on or beneath the Earth's surface.

Isogonic Line

  • Represents Earth's magnetic field lines.

Good Field Note Principles

  • Legibility
  • Integrity
  • Accuracy
  • Arrangement
  • Clarity

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Description

Test your knowledge on essential field surveying techniques, including field note integrity, corrected bearing calculations, and map scale comparisons. This quiz also covers systematic errors and azimuth conversions relevant to field surveys.

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