班加罗尔geojson地图与d3 js [英] Bangalore geojson map with d3 js
问题描述
我试图通过使用d3.js使用其中有8个区域（功能）的Bangalore geojson文件
Am trying to use a Bangalore geojson file with 8 zones (features) in it by using d3.js
地图未正确显示。这里有什么问题。 ??
The map is not showing up properly. What's wrong here. ??
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: expr maps</title>
<script type="text/javascript" src="d3/d3.min.js"></script>
<style type="text/css">
/* No style rules here yet */
</style>
</head>
<body>
<script type="text/javascript">
//Width and height
var width = 500;
var height = 300;
var vis = d3.select("body").append("svg")
.attr("width", width).attr("height", height);
d3.json("BangZone.json", function(json) {
// Create a unit projection.
var projection = d3.geo.mercator()
.scale(1)
.translate([0, 0]);
// Create a path generator.
var path = d3.geo.path()
.projection(projection);
// Compute the bounds of a feature of interest, then derive scale & translate.
var b = path.bounds(json),
s = .95 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height),
t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2];
// Update the projection to use computed scale & translate.
projection
.scale(s)
.translate(t);
path = path.projection(projection);
// add a rectangle to see the bound of the svg
vis.append("rect").attr('width', width).attr('height', height)
.style('stroke', 'black').style('fill', 'none');
vis.selectAll("path").data(json.features).enter().append("path")
.attr("d", path)
.style("fill", "red")
.style("stroke-width", "1")
.style("stroke", "black")
});
</script>
</body>
</html>
文件是： BangaloreGeojsonwithZones
Geojson文件或d3代码中的问题
Is the problem in geojson file or in the d3 code??
推荐答案
您的GeoJSON文件使用EPSG： ：37001。尝试将其转换为EPSG：4326，看看这是否有帮助。您可以使用 QGIS 转换。
Your GeoJSON file uses EPSG::37001. Try converting it to EPSG:4326 and see if that helps. You can convert it with QGIS.
我有一个类似的问题，解决方案是这里： d3-javascript-and-geojson-lines-in-stockholm-map-very-strange 。
I've had a similar problem, the solution is here: d3-javascript-and-geojson-lines-in-stockholm-map-very-strange.
这篇关于班加罗尔geojson地图与d3 js的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
