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|  MIL-D-89009
3.
REQUIREMENTS
3.1
Accuracy.
3.1.1
Absolute horizontal accuracy. The absolute horizontal
accuracy of the DCW for all features derived from Operational
Navigation Charts (ONCs) is 2040 meters (6700 feet) rounded to the
nearest 5 meters at 90% Circular Error (CE), World Geodetic System
(WGS84). The absolute horizontal accuracy of the DCW for all
features derived from Jet Navigation Charts (JNCs) is 4270 meters
(14006 feet) at 90% Circular Error.
3.1.2
Absolute vertical accuracy. The absolute vertical
accuracy of the DCW is the same as for the original ONC and JNC
lithographs at 90% Linear Error (LE), Mean Sea Level (MSL).
a. Contour accuracy. The accuracy of contours collected
from ONC source is +610 meters (+2000 feet).
b. Spot elevations. The accuracy of spot elevations
collected from ONC source is +30 meters (+100 feet).
3.1.3
Displaced feature symbols. The accuracy requirements
stated in 3.1.1 and 3.1.2 do not apply to feature symbols that are
displaced as identified in MIL-STD-600003 (reference displacement
rules).
3.2
Datum.
3.2.1
Horizontal datum.
The horizontal datum shall be the
current WGS.
3.2.2
Vertical datum.
The vertical datum shall be Mean Sea
Level.
3.3
Units of measure. Units of measurement in this product
specification are given in the metric system. They are also
presented in English units, where appropriate. The unit of
measurement for the DCW database shall be the English measurement
system.
3.4
DCW product overview.
3.4.1
Product description. The DCW is a general-purpose
global digital database designed to support Geographic Information
System (GIS) applications. The DCW database contains five
libraries represented on four CD-ROMs. The BROWSE library
contains world-wide data at approximately 1:31,000,000 scale,
which supports overview displays at a global scale. There are four
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