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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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The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
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The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
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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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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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Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
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The Development of a New Location-Based Accessibility Measure Based on GPS Data.

Feng Liu1, Ansar Yasar1, Jianxun Cui2,3

  • 1Transportation Research Institute (IMOB), Hasselt University, 3500 Hasselt, Belgium.

Sensors (Basel, Switzerland)
|October 29, 2025
PubMed
Summary

This study introduces a new accessibility measure that accounts for travel time variability, offering a more accurate assessment of transportation networks. The novel approach reveals significant underestimations in conventional methods, improving urban planning.

Keywords:
GPS dataimpedance functionlocation-based accessibilitytravel time distribution

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Area of Science:

  • Transportation Science
  • Urban Planning
  • Geographic Information Systems

Background:

  • Sustainable transport network management relies heavily on accessibility.
  • Conventional accessibility measures often use only average travel times, ignoring crucial travel time distributions.
  • This simplification leads to inaccurate accessibility assessments, especially in dynamic traffic conditions.

Purpose of the Study:

  • To develop and validate a novel accessibility measure that incorporates travel time probability density distributions.
  • To quantify the impact of travel time variability on accessibility estimations.
  • To compare the proposed method with existing potential accessibility calculations.

Main Methods:

  • Developed a new accessibility model integrating travel time probability density functions.
  • Utilized GPS data from taxis in Harbin, China, for analysis.
  • Compared accessibility results from the novel method against conventional potential accessibility calculations.

Main Results:

  • The proposed method revealed that existing accessibility measures underestimated accessibility by 6-28% (average 17%) across 103 study zones.
  • Inaccuracies in conventional methods led to the misclassification of 20% of urban areas with low accessibility.
  • The novel approach demonstrated higher sensitivity to real-world traffic conditions.

Conclusions:

  • Conventional accessibility measures provide biased and misleading estimations due to their neglect of travel time variability.
  • The travel time variability-integrated accessibility measure offers a more accurate and objective assessment of transportation network performance.
  • This improved assessment is crucial for effective sustainable transport planning and management.