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Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

120
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...
120
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

88
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...
88
Errors in Global Positioning System01:26

Errors in Global Positioning System

112
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
112
Distance Measurements by Taping01:18

Distance Measurements by Taping

98
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
98
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

118
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...
118
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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Related Experiment Video

Updated: Sep 11, 2025

Author Spotlight: UAV Remote Sensing for Efficient Invasive Plant Biomass Estimation
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Ridge estimation-based vision and laser ranging fusion localization method for UAVs.

Huayu Huang, Chen Chen, Banglei Guan

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    This study introduces a new UAV-based fusion localization method using ridge estimation. It improves target tracking accuracy and robustness, especially in challenging conditions with limited observations.

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    Area of Science:

    • Robotics and Autonomous Systems
    • Geospatial Information Science
    • Sensor Fusion

    Background:

    • Unmanned Aerial Vehicles (UAVs) are increasingly used for target tracking and localization.
    • Traditional methods face challenges with accuracy and robustness under limited observation conditions (e.g., long distances, small angles).
    • Multicollinearity in least squares estimation degrades localization performance.

    Purpose of the Study:

    • To develop an enhanced fusion localization method for UAVs.
    • To improve localization accuracy and robustness by combining sequential imagery and laser ranging.
    • To address the issue of multicollinearity in the design matrix.

    Main Methods:

    • Proposed a fusion localization method integrating sequential imagery and laser ranging data.
    • Introduced ridge estimation to mitigate multicollinearity in the design matrix under limited observation conditions.
    • Compared the proposed method against ground localization algorithms using single information sources.

    Main Results:

    • The proposed fusion method significantly enhances localization accuracy compared to single-information algorithms.
    • Ridge estimation effectively improves the robustness of the localization system.
    • Performance gains are particularly notable under challenging, limited observation scenarios.

    Conclusions:

    • The fusion localization method based on ridge estimation offers superior accuracy and robustness for UAV-based target tracking.
    • Ridge estimation is a viable technique to overcome multicollinearity issues in sensor fusion for localization.
    • This approach provides a more reliable solution for UAV navigation and surveillance.