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This method opens a street network and loads all information into memory. Files are loaded from Directory property.


If attributes is true, attribute.bin is also opened.


Set coord3cache to true, unless you have limited RAM.


Set spatialindex to true, if you want to load the spatial index and use TSpatialSearch methods.


ExternalID parameter:

0: Do not open

1: Open, but no caching

2: Open, cache index

3: Open, cache index + keys


Syntax: Open(attributes, Coord3Cache, spatialindex: boolean; externalid: integer)