Shapefile to TopoJSON conversion problems

I'm trying to convert a shapefile to GeoJSON and then to TopoJSON as described in Let's Make a Map. Somewhere along the chain, something gets corrupted and my resulting image looks like below:

My workflow is as follows:

Download shapefile from: http://vcgi.vermont.gov/warehouse/search_tools - I am working with the Master Town Boundary data, specifically, the "Boundary_BNDHASH_region_towns.shp" file.

Convert shapefile to GeoJSON

ogr2ogr -f GeoJSON vt_towns.json Boundary_BNDHASH_region_towns.shp

Convert GeoJSON to TopoJSON

topojson -p TOWNNAME -p CNTY -o vt.json vt_towns.json

Plug into basic template with some minor modifications to Mike Bostock's example

<!DOCTYPE html>
<meta charset="utf-8">
<style>

/* CSS goes here. */

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>

    var width = 960,
        height = 1160;

    var svg = d3.select("body").append("svg")
        .attr("width", width)
        .attr("height", height);

    var projection = d3.geo.transverseMercator()
            .rotate([72.57, -44.20])
            .translate([175,185])
            .scale([100]);

    // Define path generator
    var path = d3.geo.path()
        .projection(projection);

    d3.json("vt.json", function(error, vt) {

        var vermont = topojson.feature(vt, vt.objects.vt_towns);

        svg.append("path")
            .datum(vermont)
            .attr("d", path);

    });

</script>

This is not my first d3 map (it's my second!) but I am very much at a loss as to what is going wrong. My best guess is that it has something to do with the unzipped dataset containing many shapefiles and their accompanying files.

It seems that your file uses the gridded coordinate system, use the option -t_srs EPSG:4326 to get latitude and longitude:

ogr2ogr -f GeoJSON -t_srs EPSG:4326 vt_towns.json Boundary_BNDHASH_region_towns.shp

And then continue with your workflow.

Shapefile to TopoJSON conversion problems

问题:

回答1:

收藏的人(0)

Shapefile to TopoJSON conversion problems

问题:

回答1:

收藏的人(0)

举报内容

检举类型

检举原因

检举说明(必填)

打开微信“扫一扫”，打开网页后点击屏幕右上角分享按钮