MIL-PRF-89020B
H
1
1
Hemisphere (N or S)
DD
2
2
Latitude of SW corner of cell
H
1
4
Hemisphere (E or W)
DDD
3
5
Longitude of SW corner of cell
01-99
2
8
Data edition number
A-Z
1
10
Match/merge version
integer
6
11
Minimum elevation, in meters,
of SW area. If negative, sign
will be the next place left of
most significant digit
integer
6
17
Maximum elevation of SW area
integer
6
23
Mean elevation of SW area
space
1
29
Not used
integer
5
30
Standard deviation about mean for
SW area integer
6
35
Minimum elevation of area 2
18
41
Continue as for area 1
24
59
Repeat for area 3
24
83
Repeat for areas 4-16
3.9.6 The Gazetteer file.
The Gazetteer file is only on the DTED Level
1 CD-ROM.
3.9.6.1
Gazetteer directory. The gazette directory has files
Gazette.key and Gazette.dir, plus two files for each gazette (country) with
the name convention <country>.gaz and <country>.hsh. The country name may be
abbreviated. If the minimum bounding rectangle of a CD touches any country,
the entire gazetteer for that country is included, resulting possibly in
coordinates extraneous to the geographic coverage.
3.9.6.2
Primary file. The primary file is <country>.gaz. It consists
of variable-length ASCII alpha-numeric records, one entry for each name.
Alphabetic characters are upper case. Each record consists of a designation
code in bytes 1-4, the latitude in bytes 5-11 (DDMMSSH), the longitude in
bytes 12-19 (DDDMMSSH), a space in byte 20, and a variable length name field
starting in byte 21. The name field contains a name, or a name followed by
"SEE" followed by another name. The name field is followed by a carriage
return (CR), a line feed (LF), then the next record. Even though most
coordinates are rounded to the nearest minute, seconds are included in the
format to accommodate future data. The seconds contain the digits 00.
Entries are ordered by the ASCII collating sequence of the names.
Field
Field Length
Character
Contents
in Characters
Start
Description
alpha
4
1
Designation code
integer
2
5
Degrees lat (00-90)
integer
2
7
Minutes lat (00-59)
integer
2
9
Seconds lat (00-59)
alpha
1
11
Hemisphere (N or S)
integer
3
12
Degrees lon (000-180)
integer
2
15
Minutes lon (00-59)
integer
2
17
Seconds lon (00-59)
alpha
1
19
Hemisphere (E or W)
alpha
1
20
Space
alpha
var
21
Name field
ASCII
2
var
CR LF, hex 0D 0A
3.9.6.3 Hash file. The hash, or index, file is <country>.HSH. The
hash file is a convenience for the user who wants a quick pointer into the
10
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