Digital Nautical Chart (DNC) - NGA

MIL-PRF-89023
TABLE 47. Schema for entity node primitive table
Column name Column name description Column
definition
ID Row identifier and
primary key
I,1,P
CONTAINING_FACE Face containing the
entity point
I,1,N
FIRST_EDGE Null X,1,N
COORDINATE Entity node coordinates C,1,N
TABLE 48. Example of entity node primitive table (END)
ID CONTAINING_FACE FIRST_EDGE COORDINATE
1 1 X -7.893952,43.674712
2 3 X -7.893897,43.673613
3 1 X -7.843663,43.668391
- - - -
n n X x.xxxxxx,y.yyyyyy
b. Connected node primitive table. The connected node primitive
table is identical to the entity node primitive table. The CONTAINING_FACE
column is always null and is included to maintain compatibility with the
entity node primitive table. The schema and an example connected node
primitive table are shown in TABLES 49 and 50.
TABLE 49. Schema for connected node primitive table
Column name Column name description Column
definition
ID Row identifier and
primary key
I,1,P
CONTAINING_FACE Null X,1,N
FIRST_EDGE Edge key (foreign key to
the edge tables)
I,1,N
COORDINATE Connected node
coordinates
C,1,N
TABLE 50. Example of connected node primitive table (CND)
ID CONTAINING_FACE FIRST_EDGE COORDINATE
1 X 1 -7.893952,43.674712
2 X 2 -7.893897,43.673613
3 X 3 -7.843663,43.668391
- - - -
n X n x.xxxxxx,y.yyyyyy
c. Edge primitive table. Edge primitive tables in the DNC
contain up to eight columns, depending on the topology level. The column
50