DCT Antares SB, Руководство пользователя

Страница: 163 / 238

6.13. (GR) REGIONS
A point is formed by the region’s index , the point’s index , the point’s latitude
and longitude and by other two parameters called the left neighbors . The
left neighbors of a point are the indexes of the points connected (if any) with
a line to the actual point and have a longitude value equal to or less than
the actual point’s longitude. When the actual point has no left neighbors
(there are no connected points with the same or less longitude) these two
parameters take the value of
99
each, as there is no point with
99
as index
2
.
6.13.1 Special cases
• When the actual point has only one left neighbor the first parameter
takes the neighbor’s index and the second must be
99
.
•
When two points lie on the same longitude it is not relevant which
is the point with lower index, but an special consideration must be
taken:
When two connected points lie on the same longitude
only one of them, whichever is selected, is left neighbor of the other.
• In case that a region has to cross the longitudes
E179.99999
or
W179.99999
or the latitudes
N89.99999
or
S89.99999
the region must
be divided in such a way that it never crosses those boundaries.
6.13.2 Regions’ creation examples
Take a look to the following regions’ examples that follow the directions
discussed above.
This is a region where there are not special cases. The region has
7
points.
Example: Region A
2
A maximum of 50 points may be defined for a single region
161