Hi Daniel, > So you want to e.g. give the height of a bridge above the "mean high water > spring" level of the river it crosses?
Yes. > use a qualifier. The unit would be meter Yes. > The "elevation" property we have (P2044) is defined to refer to NN It is not a good idea, to define 'elevation' like it is "defined" in P2044: there are hundreds of reference-levels (not only NN)... NN was used from 1879 to 1992 in Germany. Now in Germany we use NHN ! In other countries there are different reference levels changing in different epoches ... > you would need a more general "elevation" property, > and a "reference level" property to use as a qualifier. Yes, every elevation needs a reference level. (without a elevation measurement is not usable) > Then you could express something like "elevation: 28.3m; In WD there is a confusion between altitude and elevation? (may be in American and British English? or geographic and aviation and astronomy?) > reference-level: Q6803625". _reference-level_ could be: 'NN' 'NHN' 'LAT' 'MSL' 'MHWS' and a lot of others... But this is a combination of unit and reference-level: 'm ü.M.' We should not mix or confound this modellings... What will be the WD-way? (you should discuss this with a geodetic specialist...!) Additionally we need an expression for 'accuracy' and 'source': If the hight unit is 'meter' and the source value is in 'feet', the new value could have a lot more/less digits than the source, but no better/worse accuracy... Bests, Markus > Am 27.09.2016 um 20:26 schrieb Markus Bärlocher: >> Hallo Daniel, >> >> nein, ich suche nicht einen WP-Artikel über MHWS, >> (diesen habe ich nur verlinkt als Erklärung) >> >> sondern eine Einheit/unit, >> um MHWS als Bezugshorizont für geografische Höhen zu beschreiben. >> >> MHWS wird verwendet, um Brückendurchfahrtshöhen über Wasser zu >> definieren, sowie für die geografische Höhe von Leuchtfeuern. >> >> Mit herzlichem Gruss, >> Markus >> >> >> Am 27.09.2016 um 19:28 schrieb Daniel Kinzler: >>> Am 27.09.2016 um 19:10 schrieb Markus Bärlocher: >>>> I look for this: >>>> "Elevation in metres above 'mean high water spring' level." >>>> >>>> Which means the geographic hight above MHWS: >>>> https://en.wikipedia.org/wiki/Mean_high_water_spring >>> >>> By clicking on "Wikidata Item" in the sidebar of that page, I get to >>> https://www.wikidata.org/wiki/Q6803625 ("highest level that spring tides >>> reach >>> on average over a period of time") >>> >>> Is that what you need? _______________________________________________ Wikidata mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikidata
