EGM96 geoid heights in ValTerra
===============================

File: egm96_15.bin (read by valterra/core/geoid.py)

The model
  EGM96 geoid undulations (the height of mean sea level above the WGS84
  ellipsoid) on the 15-arc-minute worldwide grid: 1440 x 721 posts, 0.25
  degrees apart, from 90N to 90S and from 180W eastwards.

Origin
  U.S. National Geospatial-Intelligence Agency (NGA). The EGM96 model and its
  grids are in the public domain; no attribution is required.

Obtained from
  https://cdn.proj.org/us_nga_egm96_15.tif
  (PROJ-data; TIFF copyright tag "Derived from work by NGA. Public Domain")
  2,710,815 bytes, sha256
  db493027562c9b004d7220fa881f5603adada4e1c5029b933fa7de4547b0e78d

Conversion
  Converted by ValTerra (tools/make_geoid.py) to a grid of whole centimetres:
  a 40-byte header, then one little-endian 2-byte integer per post, row 0 at
  90N and column 0 at 180W. Each value is rounded to 1 cm. Nothing else is
  changed: the copy is unmodified in substance.
  Result: 2,076,520 bytes, sha256
  9afcd9431fb34d8582db1f4d0ab72c5e04af4c7fd93f51426c64a5375e1630bf
