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the DCW (3.7), and the physical record format and content of the
VPF tables and files used in the DCW (3.8).
3.6 DCW directory levels. The DCW physically organizes
geographic data into four directory levels: database, library,
coverage, and primitive (FIGURE 1).
3.6.1
Database directory level. The DCW contains one
database directory which is duplicated on each disc. The
database-specific information and metadata for the DCW are
specified at the database level. Also specified at the database
level are the libraries contained in the DCW.
3.6.2
Library directory level.
The
DCW contains five
library directories (four detailed and
one
BROWSE). Each library
contains information and metadata that
are
specific for that
library. Also specified at this level
are
the coverages contained
within each library.
3.6.3
Coverage directory level. The DCW contains 17
coverage directories in each of the 4 detailed libraries and 8
coverages in the one BROWSE library. Each coverage contains the
feature, primitive, and attribute information that make up a
thematic layer.
3.6.4
Primitive directory level. The DCW contains up to
four VPF primitive types: nodes, edges, faces, and text,
organized on the basis of physical tile partitions.
8
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