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|Home GeoPack GeoDB Properties IxLongLow|
|See also: IxItemID, IxLatHigh, IxLatLow, IxLongHigh, TIxLLRec, GetClosestLongLowIx|
In order to find database entries quickly TGeoDb maintains five indexes offering an ordered access to the latitudes, longitudes and item IDs of the database entries. Since a database entry may contain more than one point (e.g. country borders are polygons with many points), individual indexes are maintained both for the lowest and highest latitudes/longitudes.
The read-only array property IxLongLow provides an ordered list of the lowest longitudes of all database entries. The parameter ix specifies the number of the index entry and may take values between 1 and NumEntries. The property returns the longitude and the corresponding entry number of the database.