Shapefile到TopoJSON转换问题 [英] Shapefile to TopoJSON conversion problems
问题描述
我尝试将shapefile转换为GeoJSON，然后转换为TopoJSON，如 -
我使用< a href =http://maps.vcgi.org/gisdata/vcgi/packaged_zips/BoundaryOther_BNDHASH.zip =nofollow noreferrer> Master Town Boundary 数据，特别是Boundary_BNDHASH_region_towns.shp文件。
将shapefile转换为GeoJSON
ogr2ogr -f GeoJSON vt_towns.json Boundary_BNDHASH_region_towns .shp
将GeoJSON转换为TopoJSON
topojson -p TOWNNAME -p CNTY -o vt.json vt_towns.json
插入基本模板，对Mike Bostock的例子稍作修改
<！DOCTYPE html> ;
< meta charset =utf-8>
< style>
/ * CSS在这里。 * /
< / 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高度）;
var projection = d3.geo.transverseMercator（）
.rotate（[72.57，-44.20]）
.translate（[175,185]）
.scale [100]）;
//定义路径生成器
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>
这不是我的第一张d3地图我的第二个！），但我非常失落，什么是错的。我最好的猜测是，它与包含许多shapefile及其附带文件的解压缩数据集有关。
您的文件使用网格坐标系统，使用选项 -t_srs EPSG：4326 获取纬度和经度：
ogr2ogr -f GeoJSON -t_srs EPSG：4326 vt_towns.json Boundary_BNDHASH_region_towns.shp
然后继续使用您的工作流程。
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.shpConvert GeoJSON to TopoJSON
topojson -p TOWNNAME -p CNTY -o vt.json vt_towns.jsonPlug 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.
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