CRS Binding File

The binding (boundcrs.dat) file provides bindings between various Coordinate Reference Systems and datum transformations. Binding are identified for systems that require looking up bound CRS IDs (typically EPSG).

Most of the datums are recorded in datum.dat and the epsg.db file. However, two datums are exclusive to this file:

• RDNAP For use with compound CRS EPSG:7415 "Amersfoort / RD New + NAP height" Uses the RDNAPTRANS(TM) method and the following grid shift files: nlgeo04.grd, x2c.grd, y2c.grd.

• NTFRFG93_4275 and NTFRFG93_4807: For use with CRS that have a base geodetic CRS of EPSG:4275 and EPSG:480 respectively. Use the NTv2 method, requires the grid shift file ntf_r93.gsb.

The file format is shown below:

BindingID,CRS-ID,DatumTxID

where:

• BindingID is a unique identifier for the binding

• CRS-ID is the identifier for the coordinate reference system.

• DatumTxID is the identifier for a datum transformation. N/A can be entered for not transformation.

Sample

Entries from boundcrs.dat: