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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...
228
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...
222
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...
296
Errors in Global Positioning System01:26

Errors in Global Positioning System

245
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,...
245
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

303
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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Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

182
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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Related Experiment Video

Updated: Dec 13, 2025

Early Detection of Cyanobacterial Blooms and Associated Cyanotoxins using Fast Detection Strategy
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A GNSS-Based Crowd-Sensing Strategy for Specific Geographical Areas.

Chuan-Bi Lin1, Ruo-Wei Hung2, Chi-Yueh Hsu3

  • 1Department of Information and Communication Engineering, ChaoYang University of Technology, Taichung 413310, Taiwan.

Sensors (Basel, Switzerland)
|July 31, 2020
PubMed
Summary

This study introduces a Global Navigation Satellite System (GNSS)-based crowd-sensing strategy to map latitude and longitude coordinates to real-world locations for epidemic management. The method efficiently counts individuals within specific areas and identifies potential hotspots.

Keywords:
GNSS/GPSepidemic managementhot spotinfectious diseaseisolationsocial networking service

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Area of Science:

  • Epidemiology
  • Geospatial Analysis
  • Public Health

Background:

  • Infectious diseases like COVID-19 pose significant global threats to safety, economy, and education.
  • Restricting population movement is a key strategy for epidemic control.
  • Global Navigation Satellite System (GNSS) provides precise location data but mapping these coordinates to social contexts is challenging.

Purpose of the Study:

  • To develop a GNSS-based crowd-sensing strategy for efficient location mapping of individuals during epidemics.
  • To enable the calculation of target numbers within specific geographical areas.
  • To facilitate the identification of high-risk "hot spots" or areas during public health crises.

Main Methods:

  • Utilizing latitude and longitude coordinates from GNSS receivers.
  • Developing a strategy to map GNSS coordinates to identifiable locations.
  • Employing simulated data from a social networking platform containing location data.
  • Implementing algorithms to determine if a target is within a defined geographical area.

Main Results:

  • The proposed strategy effectively maps GNSS coordinates to specific locations.
  • The method allows for the quantification of individuals within designated geographical zones.
  • The approach successfully identified potential "hot spots" using simulated social media data.

Conclusions:

  • A GNSS-based crowd-sensing strategy offers an efficient solution for location-based epidemic management.
  • This approach enhances the ability to monitor population distribution and identify high-risk areas during outbreaks.
  • The methodology is adaptable for analyzing crowd density and movement patterns in various geographical contexts.