d3.js - d3.js で GeoJson からマップを描画する

Question

カルガリー市のオープン データ カタログからダウンロードした d3.js とシェープ ファイルを使用して、javascript でマップを描画しようとしています。市は、使用してGeoJSONのブロブに変換した形状ファイルを提供します

ogr2ogr -f geoJSON output.json CALGIS.ADM_COMMUNITY_DISTRICT.shp 

次に、ファイルを単一の形状にトリミングして、動作していることを確認しました。

{
"type": "FeatureCollection",

"features": [

    { "type": "Feature", "properties": { "GEODB_OID": 924.0, "NAME0": "Residential", "OBJECTID": 924.0, "CLASS": "Residential", "CLASS_CODE": 1.0, "COMM_CODE": "NEB", "NAME": "NEW BRIGHTON", "SECTOR": "SOUTHEAST", "SRG": "DEVELOPING", "STRUCTURE": "BUILDING OUT", "GLOBALID": "{086267D0-E600-11DE-8601-0014C258E143}", "GUID": null, "SHAPE_AREA": 2864275.556415310129523, "SHAPE_LEN": 6834.047231250339792 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2927.794099999591708, 5643887.8214, 0.0 ], [ 2978.190899999812245, 5643875.2194, 0.0 ], [ 3017.59360000025481, 5643861.5459, 0.0 ], [ 3053.779900000430644, 5643845.8617, 0.0 ], [ 3089.161999999545515, 5643826.1559, 0.0 ], [ 3129.111100000329316, 5643798.7318, 0.0 ], [ 3166.111999999731779, 5643767.0104, 0.0 ], [ 3226.018400000408292, 5643707.9734, 0.0 ], [ 3262.138399999588728, 5643679.7766, 0.0 ], [ 3302.66330000013113, 5643652.4609, 0.0 ], [ 3340.545300000347197, 5643633.9568, 0.0 ], [ 3381.070199999958277, 5643617.2149, 0.0 ], [ 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 ]
}

d3.js とhttp://vallandingham.me/shapefile_to_geojson.htmlから適合させた次のコードを使用して、これを画面に描画します。

var OpenData; (function (OpenData) {
    var CalgaryMap = (function () {
        function CalgaryMap() { }
        CalgaryMap.prototype.render = function () {
            var xy = d3.geo.albersUsa();
            var path = d3.geo.path().projection(xy);
            var vis = d3.select("#map").append("svg:svg").attr("width", 900).attr("height", 900);
            d3.json("data.json", function (json) {
                vis.append("svg:g").attr("class", "tracts").selectAll("path").data(json.features).enter().append("svg:path").attr("d", path).attr("fill-opacity", 0.5).attr("fill", function (d) {
                    return "black";
                }).attr("stroke", "#222");
            });
        };
        return CalgaryMap;
    })();
    OpenData.CalgaryMap = CalgaryMap;     })(OpenData || (OpenData = {}));

しかし、私が得るのは、次のようなごちゃごちゃした混乱です

失敗した場合に備えて、geojson ファイルを QGIS にロードして検証しました。しかし、QGISではうまく見えました。これは、おそらく私が使用していたプロジェクションだと思いました。私が持っている geojson ファイルは、GPS から知っている座標のようには見えません。そこで、射影関数を恒等関数に変更しました

function (location) {
            var xCoordinate = location[0];
            var yCoordinate = location[1];
            return [
                xCoordinate, //scale here
                yCoordinate
            ];
        };

生成したもの

このものを正しく投影するにはどうすればよいですか? これは簡単なことだと思いますが、GIS に関する知識がまったくないことが確かに私の足を引っ張っています。

Answer 1

Thanks to @Superboggly I changed the command to ogr2ogr and it produced a much more reasonable GeoJSON file. My understanding is that there are a number of different coordinate systems in use in the GIS field. I was attempting to use a file formatted in one system in a system which was expecting a different system. I think we can safely say the results were unintended.