我正在尝试使用 d3.js 和从卡尔加里市的开放数据目录下载的形状文件在 javascript 中绘制地图。城市提供了一个形状文件，我使用它转换成一个 GeoJSON
ogr2ogr -f geoJSON output.json CALGIS.ADM_COMMUNITY_DISTRICT.shp
然后我将文件修剪成一个单一的形状，以确保我的工作正常。
{
"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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]
}
我使用 d3.js 和以下改编自http://vallandingham.me/shapefile_to_geojson.html的代码将其绘制到屏幕上
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 = {}));
然而我得到的是一团乱麻，看起来像
我将geojson文件加载到QGIS中以防万一我搞砸了。但它在 QGIS 中看起来还不错。这让我觉得这可能是我使用的投影。我拥有的 geojson 文件似乎没有任何看起来像我从 GPS 知道的坐标。所以我把投影函数改成了恒等函数
function (location) {
var xCoordinate = location[0];
var yCoordinate = location[1];
return [
xCoordinate, //scale here
yCoordinate
];
};
哪个产生了
我需要做什么才能正确投影这个东西？我想这很容易，但我缺乏任何 GIS 知识肯定会妨碍我。