I'm trying to create a multi-modal network with walking and bikesharing to produce service areas around metro stations. I want to use these polygons to compare the number of jobs and number of people within walking distance and then within a walking + bikesharing distance. I'm using network analyst and have a street layer with traveltime (3km/hr) for pedestrians, a bikeshare route layer with traveltime (12km/hr) calculated between stations, and a bikeshare station layer as junction between two connectivity groups. The pedestrian street layer is the first group and is set to any vertex. The bikeshare routes are the second group and is set to end point. The bikeshare layer is set to both connectivity groups and is set to override.
I would expect that because of the bikeshare layer, people would be able to use this mode to another station and then transfer back to the pedestrian street layer and walk further from here. Since the connectivity is set so you cannot transfer except for at the stations, there might be gaps that can’t be reached due to the distance between stations.
The results I’m getting do not seem to show this when run with travel time as the impedance and metro stations set as the facility. For one, when run with both modes, there seem to be a lot of area that should be within walking distance that isn’t showing up directly surrounding the metro stations (green circle). Secondly, when the analysis is run and the bikeshare layer is excluded, there are in fact gaps between the stations but less area is covered than if the pedestrian layer is excluded. When the pedestrian layer is excluded the area is actually greater than if both modes are included.
Any idea why the pedestrian layer is producing greater results than a pedestrian and bikeshare layer which should allow travel at four times the speed?
I’ve included pictures below to show the different outputs.
Bikeshare + Pedestrian Layer
Bikeshare Layer Excluded
أكثر...
I would expect that because of the bikeshare layer, people would be able to use this mode to another station and then transfer back to the pedestrian street layer and walk further from here. Since the connectivity is set so you cannot transfer except for at the stations, there might be gaps that can’t be reached due to the distance between stations.
The results I’m getting do not seem to show this when run with travel time as the impedance and metro stations set as the facility. For one, when run with both modes, there seem to be a lot of area that should be within walking distance that isn’t showing up directly surrounding the metro stations (green circle). Secondly, when the analysis is run and the bikeshare layer is excluded, there are in fact gaps between the stations but less area is covered than if the pedestrian layer is excluded. When the pedestrian layer is excluded the area is actually greater than if both modes are included.
Any idea why the pedestrian layer is producing greater results than a pedestrian and bikeshare layer which should allow travel at four times the speed?
I’ve included pictures below to show the different outputs.
Bikeshare + Pedestrian Layer
Bikeshare Layer Excluded
أكثر...