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Related Concept Videos

Manipulation and Analysis01:21

Manipulation and Analysis

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GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...
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Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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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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Levels of Use of a GIS01:29

Levels of Use of a GIS

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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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Introduction to GIS01:28

Introduction to GIS

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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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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Related Experiment Video

Updated: Jun 28, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
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Data-Driven Insights Into Urban Intersections: Visual Analytics of High-Value Scene.

Bin Yang, Hao Tang, Xinyue Wang

    IEEE Computer Graphics and Applications
    |April 22, 2024
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    Summary

    TraVis is a new system for analyzing urban intersection traffic data. It uses visualization to explore microscopic traffic events, providing deeper insights into traffic flow and high-value scenes.

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    Area of Science:

    • Computer Science
    • Transportation Engineering
    • Data Visualization

    Background:

    • Traffic trajectory data is rich in spatio-temporal information.
    • Previous research primarily focused on macroscopic traffic flow analysis.
    • Microscopic traffic events and high-value scenes remain underexplored.

    Purpose of the Study:

    • To introduce TraVis, an interactive system for exploring and analyzing complex traffic trajectory data at urban intersections.
    • To enable the investigation of microscopic traffic events using novel visualization methods.
    • To provide intuitive insights into high-value traffic scenes for better understanding of urban traffic dynamics.

    Main Methods:

    • Development of TraVis, an interactive visualization system.
    • Novel view design and multiple interaction modalities for intuitive data exploration.
    • Analysis of microscopic traffic events and high-value scenes within trajectory data.

    Main Results:

    • TraVis facilitates a deeper understanding of urban intersection traffic.
    • Users can identify and analyze different types of high-value traffic scenes.
    • The system aids in exploring the causes behind traffic event occurrences.

    Conclusions:

    • TraVis effectively supports the analysis of microscopic traffic events at urban intersections.
    • The system enhances the understanding of complex traffic dynamics through visualization.
    • Case studies demonstrate the system's utility and effectiveness in traffic analysis.