[2011 Feb 09] Intg v3.11
For working with the GEOID06 model, two FORTRAN programs are provided
as source code (INTG.FOR and XNTG.FOR) and as compiled executables for
both Sun Unix (INTG and XNTG) and IBM PC (INTG.EXE and XNTG.EXE)
platforms. INTG will interpolate geoid heights from data files using
user-provided coordinates. XNTG will extract sub-grids from the binary
data files, as well as convert back and forth between binary and ASCII,
or just give statistics about a data file.
To use GEOID06, the INTG executable and at least one data file must be
You need only to select those data files that cover your region,
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.
Due to numerous requests, the binary formats of the eight data files
have now been switched to the native format of Intel based PCs
(little-endian). Users desiring IEEE Std. 754 binary format
should process the desired files through XNTG (in a Unix environment)
and select option 2. The user should select the default spatial
extents for the output file. Give the output file a unique
name and then change it to the input file name after the XNTG
program is complete. The resulting file will cover the same
range as the original file but will be byte-swapped. Repeat
as necessary for the desired number of files.
Graphical Interface- click on the desired image grid to download a binary file
Data (non-graphical interface)
- Binary Grids (all are 1921 columns by 721 rows and are 5,540,208 bytes in size)
- Compressed ASCII grids
- Grid #1 (60 - 72 N & 172 - 204 E, size: 4,023,668 bytes)
- Grid #2 (60 - 72 N & 202 - 234 E, size: 4,370,347 bytes)
- Grid #3 (49 - 61 N & 172 - 204 E, size: 4,427,318 bytes)
- Grid #4 (49 - 61 N & 202 - 234 E, size: 4,545,330 bytes)