Metric vs Imperial units #200
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On a recent ride using GraphHopper (I'm really a BRouter man, honest) - I enabled the "Speed" display on my navigation pane. The road limit was not present on some roads, but it was on others. CoPilot has a similar feature (a red speed limit sign overlay) which works on all roads I've travelled on. That is a minor issue, it's just nice to have it. Oddly, using the UK's imperial "MPH" unit - I frequently saw "59" instead of "60". Something to be aware of as I think these values are converted from metric. Not knowing anything about how GrapHopper is built, but it'd be interesting to inspect a routing file and see the information :) Note: We are odd here in the UK, we mix our units! |
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Replies: 5 comments 12 replies
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@MotoUKRider thanks for the report! GraphHopper documentation mentions: "max_speed: the speed limit from a sign (km/h)" Cruiser internally makes the conversion to mph. |
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Next Cruiser with imperial units will round the speed limits. @MotoUKRider this will solve such cases? Your example has 60 mph in OpenStreetMap database. |
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Available in Cruiser 3.0.23. |
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Coming back to this, during my recent "down the rabbit-hole" of nav apps on the Play Store, one particular app (I forget which one) had a "Unit" setting for each value (rather than a simple Imperial/Metric switch) where awkward people 🖐️ could use MPH for speed and metres for GPS height, plus the formatting of Lat/Lon and any other measurement format/unit. |
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The nautical units exist because some time ago I developed "Nautilus Charts". |
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Available in Cruiser 3.0.23.