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Related Concept Videos

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

Design Example: Measuring Distance Between Two Points with Obstructions

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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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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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Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

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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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Common Leveling Mistakes and Errors01:17

Common Leveling Mistakes and Errors

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A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
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Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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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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Leveling Equipment01:18

Leveling Equipment

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As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
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Multi-target automatic positioning based on angle and distance parallel measurement.

Shuo Yang, Linghui Yang, Tengfei Wu

    Optics Express
    |December 13, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new multi-target positioning method for large-scale manufacturing, improving 3D coordinate measurement efficiency and accuracy using parallel angle and distance measurements.

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    Area of Science:

    • Metrology and Measurement Science
    • Industrial Manufacturing Technologies
    • Aerospace and Marine Engineering

    Background:

    • Accurate 3D coordinate measurement is crucial for large-scale component manufacturing in aerospace and shipbuilding.
    • Conventional metrology systems face challenges in efficiency and automation for large structures.
    • Need for enhanced precision and speed in industrial measurement processes.

    Purpose of the Study:

    • To develop and validate a multi-target automatic positioning method for rapid, parallel angle and distance measurement.
    • To improve the efficiency and automation of 3D coordinate measurement in large-scale manufacturing.
    • To enhance the accuracy of 3D coordinate measurements beyond conventional methods.

    Main Methods:

    • Decoupling angle and distance measurements for simultaneous execution.
    • Utilizing a cooperative target for rotary-laser scanning angle and absolute distance measurement.
    • Implementing multi-target rough positioning via laser scanning followed by precise coordinate measurement with absolute distance constraints.
    • Proposing a method for internal zero-length determination and mirror offset error compensation in distance measurement.

    Main Results:

    • Demonstrated feasibility of the multi-target automatic positioning method through a real-site experiment.
    • Achieved 3D coordinate measurement accuracy better than 0.17 mm when compared to a laser tracker.
    • Verified enhanced measurement efficiency and automation compared to traditional metrology systems.

    Conclusions:

    • The proposed parallel angle and distance measurement method significantly enhances efficiency and automation in 3D coordinate measurement.
    • The developed technique provides high accuracy suitable for critical applications in large-scale manufacturing.
    • This approach offers a viable solution for precise metrology in the aerospace and shipbuilding industries.