Returning route geometry using OpenTripPlanner API

Based on my Plugin I made a responsive processing tool for QGIS, which does exactly what I need, but cannot post it here due to Body is limited to 30000 characters; you entered 32412., so just follow the link....

PS: I still have an open question to improve it, in case you know the answer: Changing feature attribute just after adding via QgsFeatureSink

I basically wrap this thing and added in an existing python site-package called rasta with an easy-to-use class. Here is an example:

from rasta.navigate_with_otp import GetOtpRoute

my_otp_nav = GetOtpRoute(
    start_coord="48.81941, 9.27212",
    end_coord="48.78153, 9.20517",
    time="03:00:00", # Optinal, if not provided then it uses the current time
    date="2020/12/25", # Optinal, if not provided then it uses the current date
    MAPBOX_API_KEY=MAPBOX_API_KEY, # Necessary, only if you want to visualize in the map
    output_map_path="temporary_map", # To save the output kepler map
    mode="TRANSIT,WALK" # If not provided, then assuime the " Transit and walk"
)

A notebooks is also available here, which shows dataframe and visualisation as well.

I have developed a PlugIn for QGIS which can do this: https://plugins.qgis.org/plugins/OpenTripPlannerPlugin/. It decodes the polylinestrings as mentioned in my first answer.

Your OTP-Server needs to be accessible without a proxy or authentification; enter its URL including the part to the router in "General Settings" tab (e.g. http://localhost:8080/otp/router/myrouter/)

Then choose your one or two point layers containing the starts and stops. Note the checkbox "Create only Routes for matching Fields" if you wish to create a matrix or create all routes from source to target. Then choose your desired settings and hit run.

If you are an R user you could use https://docs.ropensci.org/opentripplanner/

You can then save out the results in a QGIS compatible format

otpcon = otp_connect()
mydata = otp_plan(otpcon, from, to)
sf::write_sf(mydata,"mydata.gpkg")

plan resource returns an encoded polylinestring.

This can be turned into 'actual geometry' using scripts from this Stack Overflow question: https://stackoverflow.com/questions/9217274/how-to-decode-the-google-directions-api-polylines-field-into-lat-long-points-in/22737305

There are working ports for python, VBA, Java, ...

These can be used to create a GeoJSON file of the route.