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Related Concept Videos

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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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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Adjusting a Traverse01:12

Adjusting a Traverse

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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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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

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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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Errors in Global Positioning System01:26

Errors in Global Positioning System

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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,...
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Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Author Spotlight: UAV Remote Sensing for Efficient Invasive Plant Biomass Estimation
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A Novel Method of UAV-Assisted Trajectory Localization for Forestry Environments.

Jian Huang1, Xiansheng Guo1

  • 1Department of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

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|June 19, 2024
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Summary

This study introduces a novel UAV-assisted localization method for forests, overcoming GPS limitations. The system optimizes drone positioning using multi-agent deep reinforcement learning for accurate target tracking in challenging environments.

Keywords:
equipment heterogeneityleast squaresmulti-agent deep reinforcement learningtrajectory localization

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Area of Science:

  • Robotics and Autonomous Systems
  • Geospatial Intelligence
  • Wireless Communication

Background:

  • Global Positioning Systems (GPS) are unreliable in dense forest canopies.
  • Existing localization methods require fixed infrastructure, unsuitable for dynamic forestry.
  • Environmental uncertainties degrade signal quality and reduce localization accuracy.

Purpose of the Study:

  • To develop an innovative trajectory localization method for forestry environments.
  • To address the limitations of traditional localization systems in complex terrains.
  • To enhance localization accuracy and reliability using Unmanned Aerial Vehicles (UAVs).

Main Methods:

  • Utilizing multi-agent deep reinforcement learning (DRL) to optimize UAV topology in real-time.
  • Employing Received Signal Strength (RSS) measurements from UAVs to the target.
  • Implementing a least squares algorithm for flexible and reliable location estimation.
  • Incorporating shared replay memory to improve DRL system performance and efficiency.

Main Results:

  • The proposed UAV-assisted method achieves flexible and high-accuracy trajectory localization.
  • Demonstrated superior robustness against high-dimensional heterogeneous data compared to existing systems.
  • Validated suitability for challenging forestry environments through simulations.

Conclusions:

  • The novel multi-agent DRL approach offers a robust and accurate solution for localization in forests.
  • UAVs, when strategically deployed, significantly enhance localization capabilities in GPS-denied areas.
  • This method provides a reliable alternative for forestry applications requiring precise spatial awareness.