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Related Concept Videos

Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

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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 alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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A Geographic Information System (GIS) combines specialized software and hardware to effectively manage, analyze, and present spatial and related data. GIS software includes critical functionalities such as a user interface for easy navigation, database management tools for handling spatial and attribute data, and data retrieval features for efficient access. Analytical tools transform raw data into insights, while display functions produce maps and reports in various formats for effective...
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Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
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Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
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Computing Geographical Networks Generated by Air-Mass Movement.

H Richard1, D Martinetti1, D Lercier2

  • 1INRAE BioSP Avignon France.

Geohealth
|October 20, 2023
PubMed
Summary
This summary is machine-generated.

Air masses create atmospheric highways, connecting distant locations. TropoLink visualizes these connections, aiding in tracking the spread of airborne substances like pollen and pollutants.

Keywords:
HYSPLITair trajectoryparticle dispersalpest spreadtropolinktropospheric network

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Area of Science:

  • Atmospheric Science
  • Computational Geography
  • Ecology

Background:

  • Air masses transport gases and particles (pollen, microorganisms) globally.
  • Atmospheric movement creates connections between geographic locations.
  • Understanding these connections is crucial for various applications, including epidemiology and pollutant tracking.

Purpose of the Study:

  • To present an approach and web application (TropoLink) for quantifying potential connections between distant locations via air-mass movement.
  • To build trajectory-based geographical networks using air-mass transport data.
  • To illustrate the application of this approach in plant epidemiology and other domains.

Main Methods:

  • Utilizing the HYSPLIT atmospheric transport and dispersion model to compute air-mass trajectories.
  • Calculating connection frequencies (connectivities) to build trajectory-based geographical networks.
  • Developing a web application for intensive computation and mobilization of meteorological data to create weighted directed networks.

Main Results:

  • Demonstrated the approach's utility across different spatial and temporal scales with three plant epidemiology case studies.
  • Successfully described the invasion potential of a migratory pest beyond its known distribution.
  • Generated weighted directed networks representing air-mass movement connections.

Conclusions:

  • The TropoLink approach effectively quantifies potential geographical connections mediated by air-mass movement.
  • This method has broad applicability in diverse fields, including pest invasion risk assessment and long-term pollutant spread analysis.
  • The developed web application facilitates user-friendly analysis of complex atmospheric transport networks.