[mkgmap-dev] unpaved roads

Tue Feb 7 10:07:26 GMT 2017

I have never mapped any myself. Mostly, AFAIK, ice roads are used by large
vehicles on the North Slope of Alaska where they haul supplies to the oil
fields or out to wellheads in the Arctic Ocean. There are only three in
Alaska, two are service roads, one uses the ice_road=yes tag, the other
surface=ice while the last is actually a ferry route on a frozen river.
That one was tagged with ice_road=yes and surface=ice_road. I changed the
surface tag to surface=ice and left the other tags as is but I don't think
tagging a ferry route as an ice_road is correct.

As for tagging, I would consider them unpaved at the minimum because IMO
drivers of ordinary vehicles would generally want to avoid them. In the
case of the oil field service roads, those are most likely restricted
(acess=private) anyway so shouldn't be used in a routing scenario. Your
ice_road rule looks good to me and sidesteps the question of setting them
to unpaved nicely.

I found your full surface rule and inserted it into my lines style sheet
instead of the one I had been using.

Thank you.

On Tue, Feb 7, 2017 at 4:08 PM, lig fietser <ligfietser at hotmail.com> wrote:

> Talking about surface=ice, how do we handle ice_road=yes? Those roads are
> common in the Arctic regions and cross frozen lakes, so only accessible in
> winter. See http://overpass-turbo.eu/s/ls3
>
> In the generic new style map I made those roads unroutable.
> https://github.com/ligfietser/mkgmap-style-sheets/blob/
> master/styles/generic%20new/lines
> highway=* & ice_road=yes { addlabel 'ice road' } [0x10002 resolution 24]
>
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-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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