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Related Concept Videos

Distance Corrections01:15

Distance Corrections

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...
Introduction and Methods of Leveling01:26

Introduction and Methods of Leveling

Leveling is a surveying procedure used to determine elevation differences between distant points. Elevation refers to the vertical distance above or below a reference datum, typically mean sea level (MSL). In the United States, elevations are often referenced to the mean sea level station at Father Point Rimouski along the St. Lawrence Seaway. To make the datum accessible, permanent markers are established throughout the region. These markers, called benchmarks, have known elevations. If the...
Differential Leveling01:12

Differential Leveling

Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Common Leveling Mistakes and Errors01:17

Common Leveling Mistakes and Errors

A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
Adjusting a Traverse01:12

Adjusting a Traverse

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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Updated: Jul 1, 2026

Methods for Staging Pupal Periods and Measurement of Wing Pigmentation of Drosophila guttifera
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Readjusting observational grids in dragonfly field guides.

Sander Turnhout1, Willem Halffman1

  • 1Institute for Science in Society, Radboud University Nijmegen, Nijmegen, Netherlands.

Social Studies of Science
|July 8, 2023
PubMed
Summary

Field guides evolve as community concerns shift, altering how wildlife, like dragonflies, are identified. This research explores how observational grids change with ethics, recreation, tools, and conservation goals.

Keywords:
biodiversitydistributed cognitiondragonfliesnaturalist communitiesobservational gridswildlife enthusiasts

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Area of Science:

  • Science and Technology Studies (STS)
  • Ecology
  • Conservation Biology

Background:

  • Wildlife field guides provide observational grids, enabling species identification by highlighting key distinguishing features.
  • These observational grids shape how users perceive and interact with the natural world, influencing what is considered significant.

Purpose of the Study:

  • To investigate how observational grids in wildlife field guides change over time.
  • To demonstrate how evolving community concerns—including ethics, recreation, tools, and conservation—impact species identification criteria.

Main Methods:

  • Analysis of the historical development of Dutch dragonfly field guides.
  • Transdisciplinary research combining emic knowledge from a dragonfly enthusiast with STS research methods.

Main Results:

  • The characteristics used to identify dragonflies have changed in response to shifts in observational ethics, recreational interests, technological affordances, and conservation priorities.
  • These changes affect not only identification practices but also the very perception of dragonfly biodiversity.

Conclusions:

  • Observational grids are dynamic and socially constructed, reflecting broader societal values and concerns.
  • Understanding these shifts is crucial for effective wildlife observation, identification, and conservation efforts.