function mapInit(json){
    geojson = json.features;

    //Leaflet初期設定
    map = L.map('map', {
        maxZoom: 15,
        minZoom: 1,
        crs: L.CRS.Simple //(L.CRS.Simpleは緯度経度の代わりにシンプルなXY座標でマップを表示します)
    });

	
    var southWest = new L.LatLng(54.88, 138.48);
    var northEast = new L.LatLng(54.88, 138.48);
    //var southWest = new L.LatLng(64641, -167786);
    //var northEast = new L.LatLng(126779, -147119);
    var bounds = new L.LatLngBounds(southWest, northEast);
    map.fitBounds(bounds);

    //デフォルトズーム
    map.setZoom(10);
	
	
    //Leafletに用意されたsvgを使う 
    map._initPathRoot();	


    // svg要素を選択
    var svg = d3.select("#map").select("svg");
    g = svg.append("g");

    //緯度経度->パスジェネレーター関数作成
    var transform = d3.geo.transform({point: projectPoint});
    var path = d3.geo.path().projection(transform);

    var baseMaps = g.selectAll("path.baseMaps")
		.data(geojson)
		.enter()
		.append("path")
		.attr("d", path)
		.attr({
		    "stroke":"gray",
		    "fill":"none",
		})
	  ;


    map.on("viewreset", update);
    update();

    //pathのd属性を更新
    function update() {
        baseMaps.attr("d", path);
    }

    //位置→座標変換
    function projectPoint(x, y) {
        var point = map.latLngToLayerPoint(new L.LatLng(y, x));
        this.stream.point(point.x, point.y);
    }

}