I am using QGIS 2.6. This question is in two related parts:
I'm trying to create a raster of travel time from one point to another point travelling via the road system. Each raster pixel will roughly represent the amount of time taken to get to a given point.
Could I do this as a function of the travel-time from a number of different points? (I suppose I could using the raster calculator once I have the previous rasters.) I.e. I could estimate the total time per week if one travels to location A 5 times a week, location B 3 times a week and location C 1 time a week.
Additionally, can one incorporate a time for a given distance to the road for points that are off-road (i.e. walking distance)? I.e. an amount per metre of ground to cover the distance to the road (taking the shortest distance possible.