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Home > 7. Bathy/Topo Data

7. Handling Relief Data (Bathymetry & Topography)

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General:  These exercises are concerned with data describing the height of the land (topography) or the depth of the seafloor (bathymetry), collectively called global relief.  These data can be grids, containing relief values at regular or irregular intervals; they can also be expressed in the form of contour lines (or contour vectors) which trace the locus of points of equal relief value over the surface of the map area.  Mapping relief is extremely problematic, due to the intense public need for very high resolution products, as opposed to the often very poor available datasets.

Related Exercises:

• 2.6 Adding GEBCO Depth Contours to a Project Map in Saga

  • Includes an accuracy check

• 2.35 Managing & Visualizing MGD77 and XYZ Geologic Survey Data in Saga: NGDC

• 5.4 Masking Methods for Depth- or Height-Limited Grids in Saga

Exercises in this Group:

• 7.1 GEBCO 08 Global Relief Grid: Local Processing of Products

  • Deprecated, in favor of 7.4 GEBCO 08 Global Relief Grid:  Online Processing of Products which is infinitely easier and refers to better data

• 7.2 Creating Bathymetric Contours from Grids: GEBCO 08 Shelf Estimations

  • Use Saga module to contour bathymetry grid for areas not covered by GEBCO

• 7.3 Viewing Relief and Estimating Topographic Contours in Saga: DIVA 30-sec SRTM

  • Download 30-sec grid for Liberia area

  • Use Saga module to contour topography

• 7.4 GEBCO 08 Global Relief Grid:  Online Processing of Products

  • Use online GEBCO function to download Area-of-Interest grid

• 7.5 Merging/ViewingTiled High-Resolution Relief Grids (2-D and 3-D): CGIAR 3-sec SRTM

  • Download 3-sec grids (as tiles) for Liberia area

  • Use Saga module for combining and cutting the grids to the Area-of-Interest

  • Display final grid in 2-D and 3-D

• 7.6 Displaying 3-D Relief Data ("Topography") and Vector Overlays ("Maps") in IDV

  • Use grids as "topography" for display of vectors "maps"

  • Currently topographies must be from online THREDDS catalogs to guarantee success

• 7.7 Displaying Point Cloud, LAS-Format LIDAR Data: Saga & FugroViewer

  • Compares Saga and FugroViewer visualizations to a class GRASS image of the Serpent Mounds