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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

613
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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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

441
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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Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

469
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Related Experiment Video

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Video Movement Analysis Using Smartphones ViMAS: A Pilot Study
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Single-Image Distance Measurement by a Smart Mobile Device.

Shangwen Chen, Xianyong Fang, Jianbing Shen

    IEEE Transactions on Cybernetics
    |October 6, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new single-image method for measuring various distances using a smartphone. The technique leverages the device

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    Area of Science:

    • Computer Vision
    • Photogrammetry
    • Mobile Sensing

    Background:

    • Traditional distance measurement techniques often require multiple images or specialized setups.
    • Existing methods may be limited to specific measurements like height or require controlled photographing poses.

    Purpose of the Study:

    • To develop a novel, image-based method for measuring diverse distances from a single photograph.
    • To enable distance measurement using readily available smart mobile devices.

    Main Methods:

    • Utilizes a single image captured by a smart mobile device.
    • Employs the embedded accelerometer to determine device view orientation.
    • Implements an efficient calibration method using two known distances for pixel back-projection.
    • Transforms pixel distances to real-world distances using a linear model based on magnification ratio.

    Main Results:

    • The proposed method effectively measures various types of distances from a single image.
    • Demonstrates the feasibility of using smartphone sensors and image analysis for accurate distance estimation.
    • Experimental results validate the effectiveness of the novel approach.

    Conclusions:

    • The developed method offers a versatile and accessible solution for distance measurement.
    • It overcomes limitations of existing techniques by using single images and standard mobile devices.
    • This approach has potential applications in various fields requiring on-the-spot measurements.