Routes in North Russia gets stuck

[siggemannen]

Hello again. I noticed that the routes east of the russian horn aren't properly generated, for example this route between Dikson and Tiksi

FromLatitude | ToLatitude | FromLongitude | ToLongitude -- | -- | -- | -- 69.680791392377 | 71.762329776877 | 170.213397039944 | 129.200203648516

becomes rerouted through China:

Do you think its safe to add a new string so these routes get picked up? The downside is that perhaps vessels going from Norway to China mind end up rounding the russian side instead of going through the normal south route.

== A bit unrelated thing is that there's a straight line through the Russian right side which probably lead to land route:

Perhaps it's not needed since there's a real sea route between Russia and Alaska

[genthalili]

Hi @siggemannen,

I updated the network to covert that north part as well, though not yet updated the package.

Network updated :

However, for the 2nd part, are you trying to make a connection between China and north part of Russia (like Tiksi) via Bering Sea?

[siggemannen]

Hi and sorry for long reply. About your second question, yeah, there are some ports on the east part of russia which route to Magadan through the Bering:

Right now it works, but looks a bit funny cause it makes a straight cut through the land

[genthalili]

Hi @siggemannen, can you provide some examples (lon,lat) where we see the straight line?

[siggemannen]

Try this one:

numFromLatitude numToLatitude numFromLongitude numToLongitude
69.680791392377 56.22473809809 170.213397039944 162.500281063544

It's also a bit funky cause it generates longitude values that are out of regular -180 - 180 range:

{"geometry": {"coordinates": [[-180, 70], [-180, 60], [-180, 50], [-180, 50], [-180, 40], [-183.061, 46.3721], [-187.1, 52.6], [-196.9, 54.7]], "type": "LineString"}, "properties": {"duration_hours": 124.27357140834076, "length": 5523.71170195793, "units": "km"}, "type": "Feature"}

Oh btw, another question, how is the "duration_hours" calculated? Since you don't know the vessel speed

[genthalili]

Hi @siggemannen,

I released version 1.0.9: https://github.com/genthalili/searoute-py/releases/tag/1.0.9, you have now restrictions parameter:

route = sr.searoute(origin, destination, append_orig_dest=True, restrictions=[]) # if you want no restirictions and accept to use the northwest sea (which is not used a lot as a comercial route, at least not yet)
route = sr.searoute(origin, destination, append_orig_dest=True, restrictions=['suez', 'northwest']) # if you want restrictions on suez canal + northwest sea

For more info whenever to use or not the specific canal and potential expansions in the future: https://www.itf-oecd.org/sites/default/files/docs/decarbonising-maritime-transport.pdf

Let me know if version 1.0.9 fixes this issue as well.

[genthalili]

Regarding your question on duration_hours: It's calculated based on param input speed_knot which by default is 24 corresponing to an average: https://github.com/genthalili/searoute-py/blob/main/README.md#parameters Feel free to change the speed_knot based on the boat type or size, or even the route you take.