data

/data

/data/bedmap2

This data comes from the Bedmap2 project (Fretwell et al. 2013).

Several GeoJSON files are version controlled here:

• bedmap2_bed_heights.geojson: polygons representing the height of the bedrock, banded in 1 km increments
• bedmap2_bed_outline.geojson: a polygon just representing the border of the bedrock from sea level up
• bedmap2_surface_outline.geojson: a polygon representing the border of Antarctica's ice sheet

Several TIF files are not version controlled but are generated by /analysis/topography/index.qmd based on the raw Bedmap2 data:

• bedmap2_bed_small.tif is a raster of the bedrock height, downsampled to constrain file size
• bedmap2_surface_small.tif is a raster of the ice sheet height, downsampled to constrain file size
• bedmap2_thickness_small.tif is a raster of the bedrock thickness, downsampled to constrain file size

/data/nsidc

This data comes from the National Sea and Ice Data Center’s Sea Ice Index and the GLIMS Glacier Database.

Several files are version controlled here:

• glaciers-antarctica.csv: GLIMS point data on the location of glaciers, constrained to the polar region (< -60 latitude)
• seaice_media.geojson: linestrings of the average sea ice boundaries for each month of the year over the 1981-2010 period
• seaice_media.geojson: concave hulls of the above sea ice boundary linestrings

A larger set of raw files from the Sea Ice Index and GLIMS are not version controlled but are downloaded or generated by /analysis/topography/index.qmd.