Distance for some OD pairs is "N/A"

[Anjun93]

For the network around ASU, some OD pairs look inaccessible in od_accessibility.csv. The "distance" field and "accessibility" field are "N/A". It's unreasonable.

[Anjun93]

Here are the network files.
demand.csv
link.csv
node.csv
od_accessibility.csv
zone.csv
zone_accessibility.csv
zone_generation.csv

[jdlph]

Thank you for pointing this out!

The accessibility evaluation is based on the shortest path calculation between each OD pair. When N/A appears in fields accessibility and distance for an OD pair in od_accessibility.csv, it indicates that there is NO path between the two zones or the shortest path exceeds the maximum distance, which is 2147483647 (the maximum positive value for a 32-bit signed binary integer) defined in consts.py.