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Design Example: Measuring Distance Between Two Points with Obstructions01:10

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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...

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Measuring step geometry using the Nose-to-Nose method: validity and repeatability.

Daniel Johnson1, Gary Sloan

  • 1Daniel A Johnson, Inc, 6221 Swayne Dr NE, Olympia, WA 98516, USA.

Work (Reading, Mass.)
|February 10, 2012
PubMed
Summary
This summary is machine-generated.

The Nose-to-Nose method accurately measures stairway geometry, aligning with user experience and building codes. This study confirms its high validity and repeatability for assessing stair design.

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Area of Science:

  • Building Science
  • Ergonomics
  • Architectural Engineering

Background:

  • Accurate stairway geometry measurement is crucial for compliance with design goals, standards, and codes.
  • Traditional methods for measuring risers and runs (goings) do not align with code definitions or user experience.
  • The Nose-to-Nose method offers an alternative approach to stairway geometry assessment.

Purpose of the Study:

  • To determine the validity of the Nose-to-Nose method for measuring stairway geometry.
  • To assess the repeatability of the Nose-to-Nose method in stairway measurements.
  • To compare the Nose-to-Nose method with traditional measurement techniques in terms of user experience and code compliance.

Main Methods:

  • Two researchers employed the Nose-to-Nose method to measure risers and runs on two distinct stairways.
  • One stairway was carpeted, while the other was not, to assess the method's performance across different surface conditions.
  • Measurements focused on the geometric parameters as experienced by users and defined by codes.

Main Results:

  • The Nose-to-Nose method demonstrated a high degree of validity in measuring stairway geometry.
  • The study confirmed the repeatability of the Nose-to-Nose method across multiple measurements and researchers.
  • Results indicate the Nose-to-Nose method provides measurements consistent with user experience and code requirements.

Conclusions:

  • The Nose-to-Nose method is a valid and repeatable technique for measuring stairway geometry.
  • This method offers a more accurate representation of stairs compared to traditional approaches, aligning with user perception and building codes.
  • The findings support the adoption of the Nose-to-Nose method for stairway design assessment and compliance verification.