Hello,
I am working on generating 20-minute isodistance areas at 15 km/h without traffic, which corresponds to an analysis radius of 5000 meters from the origin point. My origin points are the centroids of census blocks in Canada, specifically for the city of Sherbrooke. My analysis is conducted across four levels of Level of Traffic Stress (LTS), allowing me to analyze and compare the reachable areas (isodistance) according to the LTS level, with a maximum distance of 5000 meters (20 minutes at 15 km/h in my case).
However, I am encountering an issue where certain origin points return the following error message:
Error in isochrone(r5r_core_Sherb, origins = Sherb_origins_df, mode = "BICYCLE", :
Problem in the following origin points: 24430053010, 24430302021, 24430329001. These origin points are probably located in areas where the road density is too low to create proper isochrone polygons and/or the time cutoff is too short. In this case, we strongly recommend setting polygon_output = FALSE or setting longer cutoffs.
These points are well connected to the network, and visually, there are sufficient roads to form a polygon. If I generate the isochrones with polygon_output = FALSE, they are produced without issue. However, the extracted routes do not have IDs associated with the origin.
Thank you for your assistance!
David
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