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Related Concept Videos

Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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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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Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

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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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Related Experiment Video

Updated: Apr 7, 2026

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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Tracking Human Mobility Using WiFi Signals.

Piotr Sapiezynski1, Arkadiusz Stopczynski2, Radu Gatej3

  • 1Department of Applied Mathematics and Computer Science, Technical University of Denmark, Kongens Lyngby, Denmark.

Plos One
|July 2, 2015
PubMed
Summary
This summary is machine-generated.

WiFi scans reveal human location patterns, enabling 80% mobility tracking with minimal GPS data. This highlights potential for WiFi-based positioning and privacy concerns.

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Area of Science:

  • Computer Science
  • Human Mobility Studies
  • Ubiquitous Computing

Background:

  • Human mobility data, including WiFi and GPS traces, is crucial for understanding movement patterns.
  • High-resolution data reveals latent signals within WiFi scans.

Purpose of the Study:

  • To investigate the feasibility of using WiFi scan data for high-resolution location tracking.
  • To determine the accuracy and efficiency of WiFi access points as location beacons.

Main Methods:

  • Analysis of six months of human mobility data (WiFi and GPS traces).
  • Developing methods to assign locations to WiFi access points using minimal GPS samples.
  • Utilizing WiFi access points as location beacons to track mobility.

Main Results:

  • WiFi scan time series contain a strong latent location signal.
  • A single GPS observation per person per day can locate WiFi access points.
  • WiFi access points can account for 80% of population mobility.

Conclusions:

  • Ubiquitous WiFi routers offer a significant opportunity for high-resolution outdoor positioning.
  • The study raises substantial privacy implications regarding side-channel location tracking.