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Related Concept Videos

Errors in Global Positioning System01:26

Errors in Global Positioning System

Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
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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...
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Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...
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Errors and mistakes in surveying refer to inaccuracies in measurements and data recording. The errors are deviations from the actual value caused by human sensory limitations, equipment flaws, or environmental effects. These errors are typically unintentional and can result from the inherent imperfections in the instruments used, atmospheric conditions, or the observer’s inability to perceive exact measurements. On the other hand, mistakes are caused by the surveyor's lack of attention,...

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Related Experiment Video

Updated: Jun 6, 2026

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Effects of structured mid-spatial frequency surface errors on image performance.

John M Tamkin1, Tom D Milster

  • 1The University of Arizona College of Optical Sciences, Tucson, Arizona 85721, USA. john.tamkin@gmail.com

Applied Optics
|November 25, 2010
PubMed
Summary
This summary is machine-generated.

Mid-spatial frequency (MSF) errors from aspheric fabrication cause image artifacts. This study models MSF errors to evaluate and tolerance them in optical systems, analyzing real-world component examples.

Related Experiment Videos

Last Updated: Jun 6, 2026

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
06:25

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Area of Science:

  • Optical engineering
  • Metrology
  • Image science

Background:

  • Aspheric and free-form surfaces offer superior optical performance.
  • Advanced aspheric fabrication methods leave residual tooling marks.
  • These mid-spatial frequency (MSF) marks cause structured image artifacts.

Purpose of the Study:

  • To apply mid-spatial frequency (MSF) modeling fundamentals.
  • To demonstrate MSF error evaluation and tolerancing in optical systems.
  • To analyze as-built optical components with MSF errors.

Main Methods:

  • Utilizing a previously established MSF modeling theory.
  • Applying commercial optical design software for analysis.
  • Evaluating and tolerancing MSF errors within optical system designs.

Main Results:

  • Demonstrated a methodology for evaluating MSF errors.
  • Provided insights into tolerancing strategies for MSF errors.
  • Analyzed real-world optical components exhibiting MSF errors.

Conclusions:

  • MSF modeling is crucial for understanding and mitigating image artifacts.
  • Effective tolerancing of MSF errors is essential for high-performance optics.
  • Analysis of as-built components validates the MSF modeling approach.