Surveying and Geomatics | 1. Contouring by Abraham | Learn Smarter
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Knowledge
1. Contouring

The chapter provides a comprehensive understanding of contour mapping, including the definition and significance of contour lines, contour intervals, and their characteristics. It explores various methods for surveying and contour mapping, digital elevation models (DEMs), and the computation of areas and volumes. The relationship between contour intervals and factors such as map scale, terrain nature, and project purpose is emphasized, providing a practical framework for effective surveying and engineering design.

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Sections

  • 1.16

    Contouring

    This section explains the importance and methodology of contouring in representing 3D terrain on 2D maps.

    Learning Practice

  • 1.16.1

    Contour Interval

    The contour interval is the constant vertical distance between successive contour lines on a map, which is essential for accurately representing topography.

    Learning Practice

  • 1.16.2

    Factors Deciding The Contour Interval

    The contour interval on a map is determined by various factors such as the scale of the map, the purpose of the map, the nature of the ground, and the availability of time and funds.

    Learning Practice

  • 1.16.3

    Characteristics Of Contour Lines

    This section explains the characteristics of contour lines and what specific shapes or arrangements signify regarding the terrain.

    Learning Practice

  • 1.16.4

    Uses Of A Contour Map

    Contour maps provide critical information for various engineering projects by depicting the relief of the ground and facilitating calculations related to site planning and resource management.

    Learning Practice

  • 1.16.5

    Methods Of Contouring

    This section outlines two primary methods of contouring in surveying: the direct method and the indirect method.

    Learning Practice

  • 1.16.6

    Digital Elevation Models (Dems)

    Digital Elevation Models (DEMs) effectively represent the spatial distribution of land-surface elevations, crucial for various Earth-related investigations.

    Learning Practice

  • 1.16.7

    Area And Volumes

    This section discusses the computation of areas and volumes in the context of engineering projects and surveying.

    Learning Practice

  • 1.16.7.a

    Computation Of Areas

    This section discusses various methods to compute the areas of irregular land shapes commonly encountered in engineering projects.

    Learning Practice

  • 1.16.7.b

    Computation Of Volumes

    This section explains the methods used to compute volumes, particularly related to earthwork in engineering projects.

    Learning Practice

References

1e.pdf

Class Notes

Memorization

What we have learnt

  • Contour lines represent ele...
  • The contour interval is det...
  • Different methods exist for...

Final Test

Revision Tests