This is the DTU21 Mean Sea surface (MSS) from DTU. The 1-minute high resolution Mean Sea Surface is computed over the 1993-2012 period from multiple satellites. The MSS is available online in two file formats and in two reference systems. Reference system: TOPEX ellipsoid: WGS84 ellipsoid (WGS84) Fileformat: XYZ (ASCII format. Grid is written out as point locations). Gravsoft: DTU Space ASCII file format . Grid contains: 10800 cells (latitude) x 21602 cells in longitude.