Who built the buildings on Prince Edward Island?

Continuing my exploration of OpenStreetMap as a database, I was curious to know how many buildings are on the map on Prince Edward Island, and how many OpenStreetMap users are responsible for having created them.

To extract the buildings I used this Overpass Turbo query:

[out:json][timeout:25];
{{geocodeArea:Prince Edward Island}}->.searchArea;
(
  way["building"](area.searchArea);
);
out meta;
>;
out skel qt;

I saved the resulting JSON output as buildings-on-pei.json; here’s what a single building looks like in that file:

{
  "type": "way",
  "id": 28325849,
  "timestamp": "2019-04-20T02:57:13Z",
  "version": 22,
  "changeset": 69393585,
  "user": "ParagonPrime",
  "uid": 1378289,
  "nodes": [
    311069933,
    311069935,
    311069936,
    2145848876,
    2145848878,
    4265414120,
    2603563172,
    311069941,
    3933036109,
    311069933
  ],
  "tags": {
    "addr:city": "Charlottetown",
    "addr:housename": "Confederation Centre of the Arts",
    "addr:housenumber": "145",
    "addr:postcode": "C1A 1J1",
    "addr:street": "Richmond Street",
    "building": "yes",
    "building:levels": "0",
    "building:levels:underground": "1",
    "level": "-1",
    "name": "Confederation Centre of the Arts",
    "roof:colour": "gray",
    "roof:material": "stone",
    "tourism": "attraction",
    "website": "https://www.confederationcentre.com/en/",
    "wheelchair": "yes",
    "wikidata": "Q5159778",
    "wikipedia": "en:Confederation Centre of the Arts"
  }
}

Note that there is a “user” element; I can use that to identify who created–or, to be more accurate, who last updated–each of the buildings.

First, I get a count of the number of buildings in the file:

# grep '"user"' buildings-on-pei.json  | wc -l
14395

Next, I get a count of the number of buildings attributed to each user:

# grep '"user"' buildings-on-pei.json  | sort | uniq -c | sort -rn
5069   "user": "MaestroGlanz",
2841   "user": "Peter Rukavina",
2816   "user": "Alecs01",
 996   "user": "Alan Bragg",
 684   "user": "mariadalton",
 534   "user": "the506",
 335   "user": "506imports",
 159   "user": "Matthew Darwin",
 143   "user": "dankpoet",
 129   "user": "kalebmcneil",
  72   "user": "lokejul",
  69   "user": "Rps333",
  57   "user": "TristanA",
  57   "user": "ParagonPrime",
  57   "user": "Gamer Gig",
  53   "user": "PurpleMustang",
  34   "user": "maTH5M2b",
  31   "user": "Bennard",
  28   "user": "Zeflind",
  20   "user": "allain_2",
  18   "user": "b-jazz-bot",
  12   "user": "Himké",
  10   "user": "dkunce",
  10   "user": "Michel G Arsenault",
  10   "user": "Kenfee3",
   8   "user": "CanuckGeographer",
   7   "user": "andrewpmk",
   6   "user": "binhex",
   6   "user": "Timothy Smith",
   6   "user": "StealthNinja51",
   5   "user": "november3000",
   5   "user": "fixedbusiness",
   5   "user": "RobJN",
   5   "user": "NoahUCD",
   5   "user": "Neeko",
   4   "user": "timdine",
   4   "user": "PelleB",
   3   "user": "xybot",
   3   "user": "wheelmap_visitor",
   3   "user": "smb1001",
   3   "user": "ionutr_telenav",
   3   "user": "hhcfw",
   3   "user": "fx99",
   3   "user": "Super-Map",
   3   "user": "Little Brother",
   3   "user": "DannyMcD",
   3   "user": "Bryson",
   2   "user": "petersfreeman",
   2   "user": "ngillis",
   2   "user": "mjf87nl",
   2   "user": "kartler175",
   2   "user": "huoju",
   2   "user": "boute002",
   2   "user": "Todd Gallant",
   2   "user": "PipoCanaja",
   2   "user": "Narcissus",
   2   "user": "JamieeR",
   2   "user": "FvGordon",
   2   "user": "Cynthia King",
   2   "user": "Bootprint",
   2   "user": "Be A Mapper",
   2   "user": "AndyJBlack",
   1   "user": "yumoon",
   1   "user": "vbertola",
   1   "user": "ti-lo",
   1   "user": "thetornado76",
   1   "user": "sjharper",
   1   "user": "shang 289",
   1   "user": "scruss",
   1   "user": "safirat",
   1   "user": "pingoo",
   1   "user": "ldgallant14",
   1   "user": "landblend",
   1   "user": "have moicy",
   1   "user": "carlb",
   1   "user": "b-jazz",
   1   "user": "ansis",
   1   "user": "Sammyhawkrad",
   1   "user": "RRW",
   1   "user": "Oliver Rukavina",
   1   "user": "Kelly Rayner",
   1   "user": "HitFilmMan",
   1   "user": "Gabe Groner",
   1   "user": "EzekielT",
   1   "user": "Cranberry",
   1   "user": "CanvecImports",
   1   "user": "Ashenzari",

There are 87 OpenStreetMap users responsible for adding those 14,395 buildings to the map, with the busiest contributor being MaestroGlanz.