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Related Concept Videos

Distance Corrections01:15

Distance Corrections

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
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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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Common Leveling Mistakes and Errors01:17

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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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Distance Measurements by Taping01:18

Distance Measurements by Taping

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

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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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Angular distance constraints calibration for outdoor zoom camera.

Xuehan Zheng, Zhenzhong Wei, Guangjun Zhang

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    This study introduces a flexible outdoor zoom camera calibration method using the 2-D protractor property. The technique accurately determines intrinsic parameters with minimal control point observations, enhancing calibration reliability.

    Area of Science:

    • Computer Vision
    • Photogrammetry
    • Robotics

    Background:

    • Accurate camera calibration is crucial for various applications, including autonomous navigation and 3D reconstruction.
    • Traditional methods often require multiple views or controlled environments, limiting their applicability for outdoor zoom cameras.
    • Zoom cameras present unique calibration challenges due to their variable focal length and potential for principal point inaccuracy.

    Purpose of the Study:

    • To propose a flexible and efficient calibration method for outdoor zoom cameras.
    • To leverage the 2-D protractor property for intrinsic parameter estimation.
    • To address the challenges of principal point inaccuracy and improve calibration accuracy.

    Main Methods:

    • Utilizing control points at infinity with known angular distances.

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  • Applying nonlinear optimization to solve for the Image of the Absolute Conic (IAC) under image point constraints.
  • Decomposing the IAC using Cholesky factorization to obtain intrinsic parameters.
  • Selecting the zooming center to mitigate principal point inaccuracies.

    • Main Results:

    • The proposed method achieves accurate intrinsic parameter calibration for zoom cameras.
    • Theoretical analysis and computer simulations validate the method's performance and accuracy.
    • Real-world data demonstrates the practical effectiveness of the calibration technique.

    Conclusions:

    • The developed flexible calibration method is effective for outdoor zoom cameras.
    • The technique offers a robust solution for determining intrinsic parameters with improved accuracy.
    • This approach enhances the reliability of vision-based systems utilizing zoom cameras.