[2011 Feb 09] Intg v3.11
CONUS, Alaska, Hawaii, Guam and Northern Marianas
Islands, American Samoa, Puerto Rico and Virgin Island
files are available
For working with the USGG2009 model, two computer programs are provided
as compiled executables for both PC Win32 (INTG.EXE and XNTG.EXE)
and Sun Unix (INTG and XNTG) platforms, along with
the source code in a zip file.
INTG interpolates geoid heights from data files using
user-provided coordinates. XNTG extracts sub-grids from the binary
data files, converts back and forth between binary and ASCII data formats,
and gives statistics about a data file.
To determine geoid heights with the USGG2009 model,
download an INTG executable and at least one data file.
You need only to select those data files that cover your region of interest,
and the program will recognize which files are present. Select one or more of
the data files either by using the graphical or data interfaces.
Download the data files for your particular operating system.
The binary formats of the Unix format data files
follow the IEEE Std. 754 binary format (big-endian)
as they are developed in a Unix environment.
Programs INTG, XNTG, INTD and XNTD are all designed to
determine the user's platform and will automatically byte swap the data.
Datafiles for use on a Windows platform (little endian)
are refomatted accordingly.
PC Windows (little endian) data files
Unix, SGI (big endian, network order) data files