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Page Title:
Table 40. BROWSE thematic layers, coverages, and feature classes |
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|  MIL-D-89009
60+n*(d+8)+d
4
Integer
The byte offset from the beginning of
the file where the row of ids
associated with this index entry is
located.
60+n*(d+8)+d+4 4
Integer
The number of items within the row
associated with this index entry.
60+number of
-
-
Record ids from the table being indexed.
index entries
* (d+8)
Where: n ranges from 0 to number of index entries-1
d = size of (indexed type)
3.8.7
BROWSE coverage-level record layout.
a. BROWSE thematic layers. A BROWSE theme or thematic
layer is a grouping of thematically consistent data.
For each thematic layer, a single coverage is
implemented. All data within the thematic layer is
represented by and contained within coverage. The
BROWSE thematic layers and their associated coverages,
and feature classes are listed in TABLE 40.
TABLE 40.
BROWSE thematic layers, coverages, and feature
classes.
BROWSE library
Coverage
Feature classes
thematic layers
name
Area
Line
Point
Text
ONC Compilation Date
CO
COAREA
Data Volume
DV
DVAREA
Drainage
DN
DNAREA
DNLINE
Geographic Regions
GR
GRAREA
GRLINE
GRTEXT
Hypsographic Data
DA
DAAREA
Availability
ONC Index
IN
INAREA
INTEXT
Political/Oceans
PO
POAREA
POLINE
POTEXT
Populated Places
PP
PPPOINT
PPTEXT
b. Feature class schema tables. Each BROWSE library
coverage contains one feature class schema table. The
feature class schema table describes the relationship
between each feature table and associated primitive
table within the coverage according to the primary and
foreign keys of the tables (TABLES 41 to 48).
TABLE 41.
Format and content for Compilation Date (CO) feature
class schema table.
{Header length};\
Compilation date Feature Class Schema Table;-;\
42
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