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Related Concept Videos

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
Plotting of Topographic Maps01:29

Plotting of Topographic Maps

Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
Topographic Surveying and Contours01:29

Topographic Surveying and Contours

Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
Level Curves and Contour Maps01:22

Level Curves and Contour Maps

Level curves and contour maps provide a way to visualize functions of two variables on a two-dimensional plane. A useful example is a topographic map, where curved lines represent locations that share the same elevation. In mathematics, these curves are called level curves or contour lines. Each contour line corresponds to points in the domain where the function has a constant value. For a function of two variables written as z = f(x,y), a level curve is defined by the equation f(x,y) = k,...
Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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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Related Experiment Video

Updated: Jun 16, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
06:56

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Published on: May 23, 2017

Moiré topography.

C Chiang

    Applied Optics
    |February 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    An oblique-shadow method uses geometrical optics to create moiré patterns. These patterns can represent surface contour lines under specific illumination and observation conditions.

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    Published on: August 21, 2019

    Area of Science:

    • Optics
    • Surface Metrology

    Background:

    • Moiré patterns are typically generated by superimposing gratings.
    • Interpreting moiré patterns for surface topography requires specific methodologies.

    Purpose of the Study:

    • To demonstrate the generation of moiré patterns using an oblique-shadow method.
    • To establish the conditions under which these moiré patterns represent surface contour lines.

    Main Methods:

    • Utilizing geometrical optics principles.
    • Employing an oblique-shadow technique with a viewing grid illuminated by a light source (point or parallel).
    • Varying the observation point (finite distance or infinity).

    Main Results:

    • Successful generation of moiré patterns via the oblique-shadow method.
    • Identification of specific conditions where moiré patterns accurately depict surface contour lines.
    • The method's applicability is demonstrated under different lighting and viewing configurations.

    Conclusions:

    • The oblique-shadow method provides a viable approach for generating moiré patterns.
    • These patterns can serve as effective contour lines for surface characterization when specific geometrical conditions are met.
    • This technique offers a novel way to visualize and analyze surface topography.