MIL-PRF-89020B
3.3.1 DTED Level 1 accuracy.
3.3.1.1
Absolute accuracy.
3.3.1.1.1
Absolute horizontal accuracy .
90% Circular Error (C.E.) World Geodetic System (WGS) < 50 meters
3.3.1.1.2
Absolute vertical accuracy .
90% Linear Error (L.E.) Mean Sea Level (MSL) ≤ 30 meters
3.3.1.2
Relative vertical accuracy (point-to-point) .
≤20 meters over a 1° cell
90% L.E. MSL
3.3.2 DTED Level 2 accuracy.
3.3.2.1
Absolute accuracy.
3.3.2.1.1
Absolute horizontal accuracy .
90% Circular Error (C.E.) World Geodetic System (WGS) ≤ 23 meters
3.3.2.1.2
Absolute vertical accuracy .
90% Linear Error (L.E.) Mean Sea Level (MSL) ≤ 18 meters
3.3.2.2
Relative vertical accuracy (point-to-point) .
90% L.E. MSL ≤ 12 meters over a 1° cell for low and medium
relief terrain (0 to 20% predominant slope).
90% L.E. MSL ≤ 15 meters over a 1° cell for high relief terrain
(greater than 20% predominant slope).
3.4
Security.
3.4.1 Security Classification. The security classification of the
products generated by the use of these specifications will be the lowest
practicable. When it is necessary to assign a security classification to the
product, it shall be in accordance with established national security
procedures.
This specification is unclassified, but its resultant products can be up
to SECRET.
3.5
Product description.
3.5.1 One-degree cell. A data file of DTED Level 0, DTED Level 1 or
DTED Level 2 is a 1° by 1° cell defined by whole degree latitude and longitude
lines on WGS. A DTED file shall not cross whole degree latitude or longitude
lines.
3.5.2 Adjacent one-degree data files . Adjacent one-degree data files
shall not have gaps between them and the only overlap that exists is along
adjacent boundaries. All adjacent boundaries shall be coincident.
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