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|  MIL-D-89009
APPENDIX
30.3.3 Data quality coverage.
a. Data quality coverage. This coverage stores data
quality information in area and line feature tables.
Area primitives correspond to the effective data extents
of the individual ONC sheets from which the data were
extracted. These do not correspond to the exact
boundaries of the ONC sheets themselves, since some
overlap exists between charts. Area attributes in the
DQAREA.AFT are derived from the ONC map sheets, usually
from marginal notes. Comments stored in related tables
(DQAREA.RAT) are derived from both source material
marginal notes and from observations made by the
processing staff during the automation effort. Line
primitives are those edges comprising the effective data
extents. Line attributes exist to document edgematch
characteristics between source maps, and techniques used
to reconcile problem areas. Attributes contained in the
DQLINE.LFT tables are limited to identifying which
source charts form the border being described. Primary
attributes are stored in relate tables (DQLINE.RAT).
Both area and line feature tables have a one to many
relationship to their respective RATs, allowing an
unlimited number of comments to be stored about any area
or line features. The DQ coverage also contains text
data, allowing for documentation of regional data
quality issues within the sheets. These are not linked
to any other database primitives. Attribute values are
as described in the integer value description table
(TABLE 68).
b. Attribute definitions. The attribute names,
descriptions, and values that comprise the data quality
area feature table (DQAREA.AFT) are described in TABLE
69. For the area relate attribute table (DQAREA.RAT)
they are described in TABLE 70.
c. Attribute definitions. The attribute names,
descriptions, and values that comprise the data quality
line feature table (DQLINE.LFT) are described in
TABLE 71. For the line relate attribute table
(DQLINE.RAT) they are described in TABLE 72.
d. Text feature table. TABLE 73 provides the schema for
the data quality text feature table (DQTEXT.TFT).
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