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Extremes by area: Why did already found "Most central" caches disappear from the statistics?

+1 vote
551 views
In my PGC profile stats I had some extreme finds (extremes by area). Today I was surprised by the absence of all "most central" icons.

I checked, if there are new caches published, closer to the geographical center coordinate of that area, but there were no changes.

Will that issue be fixed? Or maybe PGC uses another method to determine the most central cache?
in Support and help by lumpiwolf (190 points)
Same thing happened with at least one "Most southern cache" in Germany:
As per 11/04/2026, when I logged it, GC9WGXE was the southernmost cache in the county of Pinneberg (in the region of Schleswig-Holstein). I had used the "Map extremes" tool in order to find out. I think I saw in my statistics that I had found the southernmost cache in this county, too, but if I check now, I don't see it anymore, because now it's GCBPV86 - which was published on 14/05/2026, a month after I had logged its predecessor.
by Grasdaggl (100 points)

1 Answer

+1 vote

Project-GC determined that there was a bug in the process through which "most central" caches were calculated. For example, the central coordinates for Uppsala, Sweden were calculated to be approximately here:

Similarly, the centroid of Spain was calculated to be where the blue pin is, when the red pin is the generally-accepted center.

 

We apologize for this error. 

I will also mention that we recently released the tool "Map Extremes" at https://project-gc.com/Tools/MapExtremes. Using this tool, you can put onto a map the extreme geocaches in any country/region/county (or multiple) as you please.

by Hügh (9.1k points)
edited by Hügh
Those images aren't available in the UK, as Imgur has blocked all access.
by Optimist on the run (Expert) (21.8k points)
I've replaced the images. Are they visible now?
by Hügh (9.1k points)
Which method is used to calculate the centroid? There is more than one method.
Different results for Germany can be seen on this Wikipedia article:
https://de.wikipedia.org/wiki/Mittelpunkte_Deutschlands
by lumpiwolf (190 points)
We use the ST_Centroid function provided by PostGIS (https://postgis.net/docs/ST_Centroid.html).
by Hügh (9.1k points)
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