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Announcement: version r3116 is a major upgrade for routing

19
Mar

There have been almost no changes to how mkgmap deals with routing for several years now. So I am very happy to announce that the latest version of mkgmap now saves much improved routing information to the map. This allows better routes to be calculated and over longer distances in many cases.

Although there are no deliberate backward incompatibilities, if you have a heavily customised style, you should carefully examine any workarounds to force particular routing behaviour as it may no longer be necessary or may work differently now.

Also the new version improves the fidelity of features on the map, such as roundabouts and parallel lines. It happens that positions can only be represented to within 1-2 meters in a Garmin map, whereas positions are recorded much more accurately than that within OSM. So some approximation is necessary, however this was made worse since mkgmap would reduce the precision right at the beginning, allowing errors to build up as the data was manipulated. Now the extra accuracy is kept throughout all processing until the map data is written and care is taken to preserve angles so that lines that are meant to be parallel are more likely to stay that way and are less likely to cross or appear to cross.

Both these improvements were added by Gerd.

[ Updated: modified to say that roundabouts and parallel lines are a better example of improvement than buildings. Buildings will be improved in a subsequent update ]

Posted by steve on 19 Mar 2014

Latest commits

  • mkgmap-r4262 improve default style (defaultStyleTidy3e.patch by Ticker Berkin with small modifications).
    11 jan 2019
  • mkgmap-r4261 don't treat amenity=shelter + shelter_type=public_transport like other shelters.
    07 jan 2019
  • mkgmap-r4260 prevent IndexOutOfBoundsException for special case where wrong house number intervals cause a road to be split into > 0x3ff segements..
    28 dec 2018
  • mkgmap-r4259 apply_first-v2.patch: Implement and document new apply_first style command..
    13 dec 2018
  • splitter-r592 route-complete.patch: Implement a new option --route-rel-values which tells splitter that route relations of the given type should be kept complete. ....
    13 dec 2018
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