GEOID99
[2008 Oct 21]
Description
For working with the GEOID99 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 GEOID99, the INTG executable and at least one data file must be
downloaded. 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.
Information
Programs
Graphical Interface - click on an image to download a binary data file
Data (non-graphical interface)
Conterminous United States
- Binary Grids (all are 1141 columns by 1081 rows and are 4,933,728 bytes in size)
- Compressed ASCII grids
- Grid #1 (58 - 40 N & 230 - 249 E, size: 3,886,292 bytes)
- Grid #2 (58 - 40 N & 247 - 266 E, size: 3,958,149 bytes)
- Grid #3 (58 - 40 N & 264 - 283 E, size: 3,761,091 bytes)
- Grid #4 (58 - 40 N & 281 - 300 E, size: 4,116,917 bytes)
- Grid #5 (42 - 24 N & 247 - 266 E, size: 3,852,387 bytes)
- Grid #6 (42 - 24 N & 247 - 266 E, size: 3,967,923 bytes)
- Grid #7 (42 - 24 N & 264 - 283 E, size: 3,825,660 bytes)
- Grid #8 (42 - 24 N & 281 - 300 E, size: 3,948,808 bytes)
Alaska
- 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: 4,018,443 bytes)
- Grid #2 (60 - 72 N & 202 - 234 E, size: 4,369,794 bytes)
- Grid #3 (49 - 61 N & 172 - 204 E, size: 4,419,956 bytes)
- Grid #4 (49 - 61 N & 202 - 234 E, size: 4,550,775 bytes)
Hawaii
- Binary Grid (421 columns by 361 rows; 607,968 bytes in size)
- Compressed ASCII grid
- Grid #1 (18 - 24 N & 199 - 206 E, size: 476,788 bytes)
Puerto Rico and Virgin Islands
- Binary Grid (301 columns by 361 rows; 434,688 bytes in size)
- Compressed ASCII grids
- Grid #1 (15 - 21 N & 291 - 296 E, size: 476,788 bytes)
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