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Geographic Information Systems (GIS) are tools for storing, analyzing, and displaying spatial data alongside related attributes. Unlike traditional information systems that address general queries, GIS incorporates spatial components, enabling users to answer "where" and "how far." For example, GIS can process housing data linked to geographic locations like zip codes, allowing insights into population density or housing distribution through thematic maps.GIS integrates technologies such as...
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Selected Data About Geographic Locations01:25

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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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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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Levels of Use of a GIS01:29

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Geographic Information Systems (GIS) operate across three levels of application, each representing an increasing degree of complexity: data management, analysis, and prediction. These levels reflect the expanding functionality and versatility of GIS technology in handling spatial data for diverse purposes.Data ManagementAt its foundational level, GIS serves as a tool for data management, enabling the input, storage, retrieval, and organization of spatial data. This level is often employed in...
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Field Application of Global Positioning System01:28

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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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GeoSentinel: past, present and future†.

Davidson H Hamer1,2,3, Aisha Rizwan4, David O Freedman5

  • 1Department of Global Health, Boston University School of Public Health, Crosstown 308, 801 Massachusetts Avenue, Boston, MA 02118, USA.

Journal of Travel Medicine
|November 28, 2020
PubMed
Summary
This summary is machine-generated.

GeoSentinel, a global network for travel-related infectious disease surveillance, has identified outbreaks and characterized diseases in travelers for 25 years. It is expanding to include research alongside surveillance for future contributions.

Keywords:
COVID-19Sentinel eventZikaantimicrobial resistanceemerging infectious diseasessurveillancetravel medicine

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Area of Science:

  • Global health security
  • Infectious disease epidemiology
  • Travel medicine

Background:

  • Established in 1995, GeoSentinel is a global surveillance network by the International Society of Travel Medicine and the US CDC.
  • Aims to monitor emerging infectious diseases and assist global public health responses.

Purpose of the Study:

  • To review the history, achievements, and future directions of the GeoSentinel Network.
  • Highlight its role in surveillance of travel- and migration-related infectious diseases.

Main Methods:

  • The network has expanded from 8 US centers to 68 sites in 28 countries since 1996.
  • Data collection and analysis on infectious diseases in travelers, migrants, and refugees.

Main Results:

  • GeoSentinel has enhanced diagnosis and treatment for returning travelers.
  • Identified unrecognized outbreaks and diseases in new locations.
  • Characterized the epidemiology of diseases like typhoid fever, leishmaniasis, and Zika virus.

Conclusions:

  • GeoSentinel has been pivotal in surveillance of travel- and migration-related infectious diseases for 25 years.
  • The network is evolving to integrate research with surveillance.
  • Its global reach uniquely positions it for future contributions to understanding travel-related infectious diseases.