var mymap = L.map("mymap").setView([38.891, 139.824], 17);
L.tileLayer('https://cyberjapandata.gsi.go.jp/xyz/std/{z}/{x}/{y}.png', {
  attribution: '<a href="https://maps.gsi.go.jp/development/ichiran.html">国土地理院</a>'
}).addTo(mymap);
