May 2019
Beginner
170 pages
4h 9m
English
Content preview from Geospatial Data Science Quick Start Guide
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Accounting for directionality
The directionality of the edges is defined in the oneway column. The definition for the column is provided in the data dictionary provided by the Geofabrik download site.
The following indicates different notations used in the code:
oneway: Is this a one-way road? F: Only driving in the direction of the LineString is allowed.
T: Only the opposite direction is allowed.
B: Both directions are OK.
For edges with oneway == 'F', no changes are required. For edges with oneway == 'T', the current edges have to flip, that is, the source and target values must be swapped. For edges with oneway == 'B', additional edges replicating the edge need to be added and then swapped. The following lines of code will achieve the ...
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