feature request: statistics of surface and smoothness

[it4workflow]

ra already offers statistics of highway. lately surface and smoothness becomes more important. i think ra could be an assistant to improve the qualitity of this tags.
surface and smoothness are one dimension sized, so you need no "hierarchy".

PS: StatisticsService.StatisticsService() looks a bittle strange, cause you call createHierarchy() without using its return? And in createHierarchy() there's a copy&paste issue: you add unknown highway * as subhierarchy to humans?

HighwayHierarchy unknown = new HighwayHierarchy("unknown");
        humans.addSubHierarchy(new HighwayHierarchy("unknown", "highway", "*"));

        hierarchy.addSubHierarchy(unknown);

[grundid]

Thanks for pointing out the bugs in the StatisticsService class.

Regarding surface and smoothness I'm not sure how to visualize the data. Do you expect all ways to have this kind of tags? Maybe you have some idea?

[it4workflow]

Do you expect all ways to have this kind of tags?

No (and therefore for QA reasons). So if not tagged, not "unkown" (which is preassigned for values not mentioned in wiki for the key) but "n/a".

Regarding surface and smoothness I'm not sure how to visualize the data.

Just simple: for each (surface, smoothness) a new row equal to "Way-Verteilung".