Vertical Offset by Grid Interpolation (NRCan byn) – Global Mapper

Vertical Offset by Grid Interpolation (NRCan byn) is an offset grid that transforms height values between two different local vertical datums. The offset data exist in a single .byn file providing a grid of elevation difference (aka vertical offset) values between between the two vertical datums at specific latitude and longitude values on the specified interpolation coordinate reference system. The elevation differences at non-grid point locations are interpolated.

The "Vertical Offset by Grid Interpolation" vertical transform has the following parameters:

Parameter Name	Parameter String	Units
EPSG Code for Interpolation CRS	EPSG code for Interpolation CRS	Integer
Vertical Offset File	file	String
Interpolation Type	interpolation_type	String
Path	path	String