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Related Concept Videos

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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Survey Safety01:28

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Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
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Design Example: Alignment of a Road Line Using GIS01:17

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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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Sight Distance in a Vertical Curve01:29

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Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
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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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Introduction to Vertical Curves01:24

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Vertical curves are parabolic transitions that connect different grades on highways and railroads, ensuring a smooth alignment between back and forward tangents. The back tangent represents the initial grade, while the forward tangent defines the subsequent grade. These curves can be symmetrical, with equal tangent lengths, or nonsymmetrical, with varying lengths. The key points defining a vertical curve include the Point of Vertical Intersection (P.V.I.), where the tangents meet; the Point of...
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Related Experiment Video

Updated: Apr 18, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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Determining a Blind Pedestrian's Location and Orientation at Traffic Intersections.

Giovanni Fusco, Huiying Shen, Vidya Murali

    Computers Helping People with Special Needs : ... International Conference, ICCHP ... : Proceedings. International Conference on Computers Helping People with Special Needs
    |January 20, 2015
    PubMed
    Summary

    This study introduces Crosswatch, a smartphone system aiding visually impaired pedestrians at intersections. It precisely locates users and estimates orientation for safer navigation, improving upon GPS accuracy.

    Keywords:
    assistive technologyblindnesssmartphonetraffic intersectionvisual impairment

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    Area of Science:

    • Computer Vision
    • Human-Computer Interaction
    • Assistive Technology

    Background:

    • Blind and visually impaired pedestrians face significant challenges navigating complex urban environments, particularly at traffic intersections.
    • Existing navigation aids, such as GPS, lack the necessary precision for detailed intersection guidance.

    Purpose of the Study:

    • To present advancements in Crosswatch, a smartphone-based computer vision system designed to assist blind and visually impaired pedestrians at traffic intersections.
    • To enhance user interaction and improve the system's localization and orientation estimation capabilities.

    Main Methods:

    • Development and testing of a modified user interface for easier image acquisition by blind participants.
    • Demonstration of precise user localization and orientation estimation using smartphone sensors and computer vision algorithms.

    Main Results:

    • The modified user interface significantly improved the ease of acquiring intersection images.
    • Crosswatch demonstrated localization precision superior to GPS.
    • The system successfully estimated user orientation within the intersection.

    Conclusions:

    • Crosswatch offers a promising solution for improving pedestrian safety and independence for visually impaired individuals.
    • The system's enhanced interface and precise localization capabilities represent significant progress in assistive navigation technology.