Topic on Talk:Wikibase/Indexing/RDF Dump Format

What does the value of wikibase:geoPrecision mean exactly?

A couple years ago I did some research and came up with this:

• "measured in 1/111000 meters (eg street address or building -> 30.8/111000)"

But I can't remember how I came to that conclusion. Is it correct?

cc @Smalyshev (WMF)

Does Wikibase/DataModel#Geographic_locations help?

• Wikibase/DataModel#Geographic locations "representing degrees of distance"

• https://en.wikibooks.org/wiki/SPARQL/WIKIDATA_Precision,_Units_and_Coordinates#Coordinates "measured in degrees. Multiply by 111000 to convert to meters"

• Google "A degree of longitude is about 111 kilometers (69 miles) at its widest. The widest areas of longitude are near the Equator, where the Earth bulges out. Because of the Earth's curvature, the actual distance of a degree depends on its distance from the Equator."

Using degrees is not the best way to measure precision since it depends on location and direction. But it is what we got.

I'll add this to Wikibase/Indexing/RDF Dump Format