Comparing and summing isochrones

[wacekk]

As I wrote in another issue, I am looking for a method for comparing isochrones generated using spNetwork (e.g. comparing two design variants). The road network in both cases will not necessarily be identical, it may differ, for example, by a built-up road. However, I assume that the vast majority will be identical (which allows individual sections to be assigned the same ID).

I am also interested in summing up - calculating the total travel time, e.g. to school and back, taking into account one-way streets. I am able to generate a network "to" and "from" by artificially changing the direction of one-way roads.

Of course, other operations than calculating the minimum, maximum (calculating the maximum distance traveled in the morning or afternoon) or summing (analyzing the path to and from a point) and subtracting (comparing variants) do not make sense on isochrones.

[wacekk]

Dear Jeremy,

You can see the practical use of the package here: https://konsultacje.um.warszawa.pl/strefy_tempo30 This is a proposal of traffic calming zones in Warsaw (currently in public consultations). Annexes (annex is in Polish "załącznik") 10, 11 and 12 are made using spNetwork (the package is quoted in the text). Annex 10 is the distance from existing higher class roads (at least the "collective" class), Annex 11 is the distance from roads outside the designed traffic calming zones. Annex 12 also includes planned roads.

Do you have any idea to show the differences between e.g. Annex 10 and 11?