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Related Concept Videos

Errors in Global Positioning System01:26

Errors in Global Positioning System

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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 Errors01:17

Common Leveling Mistakes and Errors

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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 and Mistakes in Surveying01:19

Errors and Mistakes in Surveying

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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...
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Errors occurring during blood pressure monitoring01:25

Errors occurring during blood pressure monitoring

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Blood pressure monitoring is a crucial clinical procedure in diagnosing and managing various cardiovascular conditions. Despite its significance, the accuracy of blood pressure measurements can be compromised by multiple factors, potentially leading to either falsely high or low readings. These inaccuracies are critical as they can significantly impact patient care. So, it is vital to understand these challenges deeply and adopt strategic approaches to minimize errors.
Several factors...
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Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

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Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
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Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

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GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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Related Experiment Video

Updated: May 10, 2025

Video Movement Analysis Using Smartphones ViMAS: A Pilot Study
07:51

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Examining trip-level errors in passively collected mobile device data for data quality assurance.

Peiqi Zhang1, Kathleen Stewart1, Aref Darzi2

  • 1Department of Geographical Sciences, University of Maryland, College Park, Maryland, United States of America.

Plos One
|April 25, 2025
PubMed
Summary
This summary is machine-generated.

Location-based service (LBS) data can contain trip-level errors, where trips occur on closed roads. Recent LBS datasets may have significant errors impacting travel behavior analyses.

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Area of Science:

  • Geographic Information Science
  • Transportation Science
  • Data Science

Background:

  • Location-based service (LBS) data from mobile devices is crucial for understanding travel behaviors.
  • Existing data quality assessments for LBS data often overlook trip-level errors.
  • Trip-level errors can compromise the spatio-temporal consistency of LBS datasets.

Purpose of the Study:

  • To identify and quantify a novel type of trip-level error in LBS data.
  • To assess the prevalence of these errors in recent commercial LBS datasets.
  • To highlight the impact of these errors on travel behavior analysis.

Main Methods:

  • Developed a distributed-computing workflow to detect errors.
  • Compared trip counts on closed road segments during closure periods versus non-closure periods.
  • Analyzed multiple LBS datasets from major US vendors using real-world case studies from 2023.

Main Results:

  • Several examined LBS datasets contained a significant number of trip-level errors.
  • These errors involve trips occurring on road segments during periods of closure.
  • The identified errors are present in recent, unprocessed LBS datasets.

Conclusions:

  • Trip-level spatio-temporal consistency errors are a critical data quality issue in LBS data.
  • These errors can significantly skew travel behavior analyses.
  • Users of LBS data should implement trip-level error checks during preprocessing.