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Antarctic Data Support Files

The data support files presented are based off U.S. National Ice Center (USNIC) Antarctic daily or weekly ice analysis. Support products are offered as GIS with shapefiles KMZs, and various text files.

Area
Description
Display / Format

Thumbnail image of the Antarctic denoting
             GIS files
Daily Antarctic Marginal Ice Zone (MIZ) and Overlay Shapefile

A GIS format that contains analyzed ice lines and ice concentration data derived from USNIC daily ice analysis. Two GIS shapefiles created:

  • MIZ Shapefile - contains ice lines at the ice edge and pack ice (ice concentration 80% and greater) boundaries.
  • Ice Edge Shapefile - contains an ice line that separates ice from no ice.

Thumbnail image of the Antarctic denoting
             GIS files
Weekly Antarctic Shapefile

A GIS shapefile that contains vector and attribute data that separates ice conditions based on total concentration, stage of development (ice types) with respective concentrations, and forms of ice.


Thumbnail image of the Antarctic denoting
             KMZ files
Daily KMZ Files

Two KMZ files are created with attributes defined by ice concentration.

  • Colorfill KMZ - contains color-defined ice areas for the marginal ice zone (concentration up to 80%) in yellow and pack ice (ice concentration 80% and greater) in red
  • Vector KMZ - contains color-defined ice lines for the ice edge in yellow and the marginal ice zone (concentration up to 80%) and pack ice boundary (ice concentration 80% and greater) in red.

Thumbnail image of the Antarctic denoting
             Text files
Daily Text Files

Text files are based off the USNIC daily Antarctic ice analysis. Files created are in text latitude / longitude pairs for portability and can be parsed into various platforms and programs. The following are a detail of file contents and format:

  • ASCII Format - general text format that outlines the ice edge to the nearest 1/10th of a degree.
    • South ASCII - outlines the ice edge
  • Rainform OTH Format - text format with a DoD defined header
    • MIZ - outlines ice edge and marginal ice zone (concentration up to 80%) boundaries within the Arctic.
    • Ice Extent - outlines ice edge boundary
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