parameters, the second is one grid resolution unit to the east of that position and at the same northing or latitude, and the third is two grid resolution units to the east and at the same northing or latitude. For C columns in the grid, the (C+1)th sample in the grid is located one grid resolution unit to the north, but on the same easting, or longitude, as the first sample in the grid. Horizontal Coordinate Reference System For ENC the horizontal CRS must be EPSG: 4326 (WGS84). The full reference to EPSG: 4326 can be found at . Horizontal Coordinate Reference System: EPSG: 4326 Projection: NONE Temporal reference system: Gregorian Calendar Coordinate reference system registry: Date type (according to ISO 19115): 002 - publication International Organisation of Oil and Responsible party: Gas Producers (OGP) URL: Coordinate reference system identifier Code space: Vertical Coordinate Reference System All valid S-102 datasets shall be represented with a right-handed Cartesian coordinate system. This system shall have the x-axis oriented towards positive eastings (for projected grids), or east (for geographic grids), and y-axis oriented towards positive northings (for projected grids), or north (for geographic grids). These definitions imply that the z-axis for the sounding data is positive away from the center of mass of the earth (i.e., is positive up), rather than the usual hydrographic convention of positive down (i.e., deeper depths are larger numbers and negative depths are above datum). User-level code is free to make this reflection if required, but must write the data using the up convention. In order to make this distinction clear, the term is used for the “elevation” sounding component of the BAG, rather than The uncertainty component of the “depth”. BAG shall have the same coordinate system as the elevation component, with the
parameters, the second is one grid resolution unit to the east of that position and at the same northing or latitude, and the third is two grid resolution units to the east and at the same northing or latitude. For C columns in the grid, the (C+1)th sample in the grid is located one grid resolution unit to the north, but on the same easting, or longitude, as the first sample in the grid. Horizontal Coordinate Reference System For ENC the horizontal CRS must be EPSG: 4326 (WGS84). The full reference to EPSG: 4326 can be found at . Horizontal Coordinate Reference System: EPSG: 4326 Projection: NONE Temporal reference system: Gregorian Calendar Coordinate reference system registry: Date type (according to ISO 19115): 002 - publication Responsible party: International Organisation of Oil and Gas Producers (OGP) URL: Coordinate reference system identifier Code space: Vertical Coordinate Reference System All valid S-102 datasets shall be represented with a right-handed Cartesian coordinate system. This system shall have the x-axis oriented towards positive eastings (for projected grids), or east (for geographic grids), and y-axis oriented towards positive northings (for projected grids), or north (for geographic grids). These definitions imply that the z-axis for the sounding data is positive away from the center of mass of the earth (i.e., is positive up), rather than the usual hydrographic convention of positive down (i.e., deeper depths are larger numbers and negative depths are above datum). User-level code is free to make this reflection if required, but must write the data using the convention. In order to make this distinction clear, the term “elevation” is used for the sounding component of the BAG, rather than “depth”. The uncertainty component of the BAG shall have the same coordinate system as the elevation component, with the up
S-100WG2-7.1_S-102_Product_Spec_v2.0_WorkingDraft_03032017.docx