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Page Title:
Table 39. Format for thematic index (*.*TI) file. |
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|  MIL-D-89009
integer and character value description tables utilized
for the DCW.
e. Thematic index. The DCW implements a thematic index for
each point, line, area, and text feature table using the
TILE_ID column. These indices are contained within
files having either a: PTI (Point Thematic Index), LTI
(Line Thematic Index), ATI (Area Thematic Index) or TTI
(Text Thematic Index).
The VPF thematic index (TABLE 39) is a sequential file
of data partitioned into three groups:
(1)
A fixed-length header of 60 bytes that specifies
the associated feature table and the column within
that table being indexed.
(2)
A directory consisting of a repeating number of
records identifies the location of the rows within
the subsequent data list.
(3)
One data record for each index entry consisting of
row IDs from the table that is indexed.
TABLE 39.
Format for thematic index (*.*TI) file.
Starting
# of
Field
Pos.(Bytes)
Byte
Type
Description
0
4
Integer
Sizes in bytes of this header (60)
4
4
Integer
Number of codes within the attribute
column of the table being indexed
8
4
Integer
Number of rows of data in the table
being indexed
12
1
Char
Type of index file ("T" for thematic)
13
1
Char
Field type of data element being indexed:
I, T, S, F, or R
14
4
Integer
Number of data element comprising one
directory entry (usually 1)
18
1
Char
Data type specifier for the data portion
of the index file
19
12
Char
Name of the VPF table being indexed
31
25
Char
Name of the column in the VPF table
being indexed
56
4
Char
Unused
60+n*(d+8)
d
char
The element being indexed (the code
short
value from the attribute column of
int
the table being indexed).
float
double
41
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