ISO 19127:2019 pdf download – Geographic information – Geodetic register
6.4 Additional requirements
The additional requirements are as follows.
– Requirement 25: The minimum level of information that the register manager shall accept from a submitting organization is complete data for a coordinate reference system that conforms to the requirements as specified in Clause 8. The register manager shall also accept data for compound coordinate reference systems, single coordinate operations and concatenated coordinate operations that conform to the requirements of ISO 19111:2007 and Clause 8.
– Requirement 26: The register manager shall assign individual registration identifiers for records for entities so that multiple records can point to them. Records for geodetic register entities are interdependent. When a record for an entity is modified, dependent records shall be assessed and, if required, modified.
– Requirement 27: The ISO geodetic register shall use open standardization (refer to C.1.) for the units of measure of ellipsoids, coordinate conversion and coordinate transformation parameters.
– Requirement 28: The ISO geodetic register shall conform to the ISO 6709:2008 conventions that geographic latitude is positive north of the equator and geographic longitude is positive east of Greenwich (refer to C.3.1).
– Requirement 29: Geographic coordinates and angles, which are natively in sexagesimal degree representation, shall be held in the ISO geodetic register as a single real number unit, termed a “sexagesimal DMS”, which is a concatenation of degree, minute and second values stored as a single decimal number. A leading zero shall be used for the minute and second values less than 10 (refer to C.2).
– Requirement 30: The ISO geodetic register shall conform to the International Association of Geodesy’s convention for a geocentric Cartesian coordinate system, with origin at the centre of the Earth, that the Z axis is along the Earth’s rotation axis through the north pole, X is in the plane of the equator and through the intersection of the prime meridian with the equator, and Y is in the plane of the equator forming a right-handed coordinate system (refer to C.3.1).
– Requirement 31: The ISO geodetic register shall apply a closed standard (refer to C.1) for the presentation of coordinate system coordinates as follows (refer to C.3.2):geocentric Cartesian coordinates: X, Y, Z;
– Requirement 32: The ISO geodetic register shall apply an open standard (refer to C.1.) for the positive direction of axes, and the order in which the axes are presented, in a projected coordinate reference system as part of the system definition (i.e. the positive direction of axes may be in any order of north/south and east/west) (refer to C.3.1).
– Requirement 33; The ISO geodetic register shall implement an open standard (refer to C.1.) for coordinate system linear units. Allowing native units for coordinate system linear units will avoid the danger of corruption of values caused by the misunderstanding of conversion factors.
– Requirement 34: The ISO geodetic register shall apply an open standard to the two rotation conventions, which are to apply the rotations to the point’s vector or to apply the rotations to the coordinate frame, with the proviso that the applied algorithm is valid for that convention (refer to C.4.1).
– Requirement 35: The ISO geodetic register shall name and describe coordinate operation formulae clearly and unambiguously.
– Requirement 36: The ISO geodetic register shall include coordinate operation formulae for each coordinate operation method, define the coordinate operation parameters that are used as variables in those formulae and have coordinate operation parameter values that are relevant to those formulae.
– Requirement 37: The ISO geodetic register shall describe whether a coordinate operation method may be used for the reverse operation and, when reversible, indicate whether the coordinate operation parameters are used in the reverse operation with the same or reversed sign (refer to C.4.2).
– Requirement 38: The ISO geodetic register shall record coordinate transformation parameter values between a local coordinate reference system and a global coordinate reference system from the local system (source) to the global system (target), subject to this direction not being indeterminate (refer to C.7.11).