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Page Title:
Figure 4. Tile directory hierarchy. |
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Coverage
AE/
PO/
VG/
.....
.....
Directories
First tier of
tile subdirectories
M/
A/
Z/
lettered according to
.....
.....
GEOREF longitude zones
Second tier of
tile subdirectories
K/
A/
L/
M/
lettered according to
.....
GEOREF latitude zones
Third tier of
tile subdirectories
numbered according to
23/ 31/ 32/ 33/
11/
12/ 13/ 21/ 22/
DCW tile divisions
FAC FAC FAC FAC FAC
FAC FAC FAC FAC
Primitive
FSI FSI FSI FSI FSI
FSI FSI FSI FSI
Tables
:
:
:
:
:
:
:
:
:
FIGURE 4.
Tile directory hierarchy.
c. Cross-tile topology. Topology across tiles is
maintained through the use of a reference tile id in the
edge primitive table that establishes a "cross-tile"
link over the physical tile partitions (see paragraph
3.8.8 c). This enables the database to function as a
seamless unit for analysis purposes.
3.8.10 BROWSE tile directories The BROWSE library is not
tiled and therefore contains does not contain any tile
subdirectories. All primitive tables for BROWSE coverages are
stored at the coverage directory level.
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