MIL-PRF-89020B
c.
Record sequence.
VOL
1
(Volume Header Label)
HDR
1
(Header Label for file A)
UHL
1
(User Header Label for file A)
*
DSI
(Data Set Identification Record for file A)
ACC
(Accuracy Description Record for file A)
DATA
(for file A)
*
EOF
1
(End of File for file A)
UTL
1
(User Trailer Label for file A)
*
HDR
1
(Header Label for file B)
UHL
1
(User Header Label for file B)
*
DSI
(Data Set Identification Record for file B)
ACC
(Accuracy Description Record for file B)
DATA
(for file B)
*
EOF
1
(End of File for file B)
UTL
1
(User Trailer Label for file B)
*
*
Note:
In the above sequence a Tape Mark (hardware end of file) i s
denoted by an "*".
3.8
NIMA Gateway. Digital Terrain Elevation Data can be accessed
through the NIMA Gateway via the World-Wide-Web (WWW), the Open Source
Information System (OSIS), Secure Internet Protocol Router Network (SIPRNET)
or the Joint Worldwide Intelligence Communication System (JWICS). DTED Level
0 can be downloaded from the WWW, OSIS, SIPRNET and JWICS. DTED Level 1 and
Level 2 can be downloaded from the OSIS, SIPRNET and JWICS. The DTED files
are encapsulated and compressed into one file for downloading. Detailed
instructions for downloading and decompression are available on the webpages.
3.9
DTED File descriptions on CD-ROM or from the Gateway . The three
classes of DTED are known as DTED Level 0, DTED Level 1, and DTED Level 2.
Each DTED class consists of a different set of files.
DTED File Types
DTED Level 0
DTED Level 1 consists
DTED Level 2 consists
consists of six file
of eight file types.
of four file types.
types.
onc.dir
onc.dir
onc.dir
<xxx>.dt1
<xxx>.dt2
<xxx>.dt0
Read.me
Read.me
<xxx>.avg
dmed.
dmed.
<xxx>.min
gazetteer directory
<xxx>.max
<country>.gaz
dmed.
<country>.hsh
Gazette.dir
Gazette.key
7
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