query = `
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wd: <http://www.wikidata.org/entity/>
SELECT ?item ?itemLabel ?coord
WHERE {
?item ${wdt}:${filtering_property} ${target};
rdfs:label ?itemLabel;
wdt:P625 ?coord.
FILTER(LANG(?itemLabel) = "${lang}" )
}
`
data = fetch(
`https://qlever.cs.uni-freiburg.de/api/wikidata?query=${encodeURIComponent(
query
)}`,
{
headers: { accept: "application/sparql-results+json" }
}
).then((d) => d.json())
array = data.results.bindings.map((d) => ({
item: d.item.value,
itemLabel: d.itemLabel.value,
coord: d.coord.value
}))
geoarray = geo.coords2geo(
array.filter((d) => d.coord !== undefined),
{
coords: "coord",
reverse: true
}
)
geobuffer = geo.buffer(geoarray, { dist: 400, merge: true })
geo = require("geotoolbox@2")
viz = require("geoviz@0.4.4")
d3 = require("d3@7", "d3-geo-projection@4")
get_default = () => {
const params = new URL(document.URL).searchParams;
const defaults = {
filtering_property: "P81",
filtering_target: "Q24088686",
reverse: false,
lang: "en"
};
if (params.has("filtering_property")) {
defaults.filtering_property = params.get("filtering_property");
}
if (params.has("filtering_target")) {
defaults.filtering_target = params.get("filtering_target");
}
if (params.has("lang")) {
defaults.lang = params.get("lang");
}
if (params.has("reverse")) {
defaults.reverse = params.get("reverse");
}
return defaults;
}
get_default()
target = {
if (filtering_target == "") {
return "?target";
} else {
return "wd:" + filtering_target;
}
}
wdt = {
if (reverse == true) {
return "^wdt";
} else {
return "wdt";
}
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
