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USGS CMG "Vector/Polygon Format" Definition

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This provides the vector/polygon information in CMG InfoBank Polygon

  • "Vector" and "Polygon" information represent lines as a series of points.
  • Each "line" is preceded by a "header" that indicates the start of a vector and may include attribute information (e.g., contour value).
  • "Polygon" information (as used here) refers to a specific format.
  • Vector/polygon information are commonly used for coastlines, bathymetry contours, topographic contours, contacts, tracklines, political boundaries, roads, streams, etc.
  • Vector/polygon information are commonly derived by digitizing, by scanning, or from contouring applications.
  • Polygon information can be converted into "scattered data" or into data sets to load into ARC/INFO.
  • Vector/polygon information occurs in the InfoBank as:
    • polygon -- polygon files containing coastlines, bathymetry contours, topographic contours, contacts, tracklines, political boundaries, roads, and streams information from a variety of sources.

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