MIL-PRF-89020B
3.5.3 DTED Surface characteristics .
3.5.3.1 Water
3.5.3.1.1 Flattened water bodies . Elevation values within a lake with
a diameter equal to or greater than 1200 meters for DTED Level 1 or with a
diameter equal to or greater than 600 meters for DTED Level 2 must be
identical. Sea or ocean elevation values for DTED Level 1 or DTED Level 2
shall be zero.
3.5.3.1.2 Double-line drains. Drains with a width equal to or greater
than 183 meters shall be visible in the DTED data.
3.5.3.2 Land.
3.5.3.2.1 Shorelines and coastlines . The land elevation values shall
be higher than the adjacent water elevations. Extremely shallow land just
interior to coastlines shall have + 1 meter elevation to force proper land
boundary portrayal.
3.5.3.2.2
Islands.
Islands with the major axis equal to or greater
than 600 meters for DTED Level 1 or 300 meters for DTED Level 2 shall be
included in the DTED data. Smaller islands shall be included in the DTED data
if the relief is equal to or greater than 15 meters above the water level.
3.5.3.3 Below mean sea level.
All land or water bodies below mean sea
level shall have negative elevations.
3.5.4 DTED Level 0. A data file of DTED Level 0 is produced from DTED
Level 1 or VMAP 0. The DTED Level 0 accuracy record is copied from the DTED
Level 1 accuracy record or will contain NA (Not Available) when produced from
VMAP 0. DTED Level 0 is produced with only full one-degree cells with no
voids. DTED Level 0 downloaded from the NIMA Gateway does not contain null
elevations.
3.5.5 DTED Level 1. DTED Level 1 CD-ROMs are produced with only full
one-degree cells with no voids. Only DTED Level 1 full one-degree cells with
no voids can be downloaded from the NIMA Gateway.
3.5.6 DTED Level 2. DTED Level 2 CD-ROMs are produced with partial one-
degree cells with voids. DTED Level 2 partial one-degree cells with voids can
be downloaded from the NIMA Gateway. DTED Level 2 partial cells will contain
null elevations.
3.6
Standard format.
NIMA has two methods of recording terrain
elevation data depending on the
recording media. One method is available on
Compact Disc-Read Only Memory
(CD-ROM) and from the NIMA Gateway.
The
original Standard Terrain Format
is still available on 8mm tape or and nine(9)
track magnetic tape.
3.6.1 Physical characteristics of CD-ROM.
3.6.1.1
CD-ROM characteristics . The physical characteristics of the
compact disc media are specified by the Philips/Sony Red Book. The digital
data recording characteristics of the CD-ROM are specified by the Philips/Sony
Yellow book. Logical formatting, file directory structure, and labeling of
MC&G data on CD-ROM conforms to International Standards Organization (ISO)
9660, level 1.
3.6.2
Physical characteristics of magnetic tape .
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