OSM到Google Maps多边形
我想使用Polygon类和一系列lat / lng坐标在Google地图上绘制城区地区。
OpenStreetMap为我提供了我需要的所有数据 - 如果我输入一些地区名称，我可以获得OSM XML格式的有用数据，例如OSM drawn polygon of “Vecmilgravis” district in Riga, Latvia及其data in OSM XML format。
问题是所有node个节点都按照一些奇怪的顺序排序，所以如果我只提取所有lat和lng对并为Google Maps Polygon类创建一个坐标数组看不到我所期待的：
标记正确显示＆＃cos; cos坐标顺序对它们来说并不重要，但是多边形混乱了错误的坐标顺序我从OSM数据中进行了复制。
那么，如何以正确的顺序提取（或手动排序）OSM节点坐标？
2 个答案:
答案 0 :(得分：4)
相关问题：
- how to order vertices in a simple, non-convex polygon
- how to order vertices in a non-convex polygon (how to find one of many solutions)
第二个做了我做的另外一个约束：
根据每个点相对于C的角度对顶点列表进行排序。您可以使用atan2（point.y - C.y，point.x - C.x）来查找角度。 如果两个或多个顶点具有相同的角度，则应该首先接近C的顶点。
一个选项（对于正多边形）将按照绕中心前进的顺序对顶点进行排序：
for (var i = 0; i < nodes.length; i++) {
var pt = new google.maps.LatLng(nodes[i].getAttribute("lat"),
nodes[i].getAttribute("lon"));
path.push(pt);
var marker = new google.maps.Marker({
position: pt,
map: map,
title: ""+i
})
bounds.extend(pt)
}
centerPt = bounds.getCenter();
var centerMark = new google.maps.Marker({map:map, title: "center", position: centerPt})
path = path.sort(sortFunc);
var polygon = new google.maps.Polygon({
map:map,
path: path
});
function sortFunc(a,b) {
var bearA = google.maps.geometry.spherical.computeHeading(centerPt,a);
var bearB = google.maps.geometry.spherical.computeHeading(centerPt,b);
console.log(bearA +":"+ bearB);
return (bearA - bearB);
}
使用您的数据，在多边形的中间留下一个异常点，这似乎没有意义（第1点）。
代码段
＆＃13;
＆＃13;
＆＃13;
＆＃13;
var geocoder;
var map;
var centerPt;
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(37.4419, -122.1419),
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var xmldata = xmlParse(xmlBoundaryData);
var nodes = xmldata.getElementsByTagName("node");
console.log("nodes=" + nodes.length);
var bounds = new google.maps.LatLngBounds();
var path = [];
for (var i = 0; i < nodes.length; i++) {
var pt = new google.maps.LatLng(nodes[i].getAttribute("lat"),
nodes[i].getAttribute("lon"));
path.push(pt);
var marker = new google.maps.Marker({
position: pt,
map: map,
title: "" + i
})
bounds.extend(pt)
}
centerPt = bounds.getCenter();
var centerMark = new google.maps.Marker({
map: map,
title: "center",
position: centerPt
})
path = path.sort(sortFunc);
var polygon = new google.maps.Polygon({
map: map,
path: path
});
map.fitBounds(bounds);
}
function sortFunc(a, b) {
var bearA = google.maps.geometry.spherical.computeHeading(centerPt, a);
var bearB = google.maps.geometry.spherical.computeHeading(centerPt, b);
console.log(bearA + ":" + bearB);
return (bearA - bearB);
}
google.maps.event.addDomListener(window, "load", initialize);
function xmlParse(str) {
if (typeof ActiveXObject != 'undefined' && typeof GetObject != 'undefined') {
var doc = new ActiveXObject('Microsoft.XMLDOM');
doc.loadXML(str);
return doc;
}
if (typeof DOMParser != 'undefined') {
return (new DOMParser()).parseFromString(str, 'text/xml');
}
return createElement('div', null);
}
var xmlBoundaryData = '<?xml version="1.0" encoding="UTF-8"?><osm version="0.6" generator="CGImap 0.4.0 (20233 thorn-01.openstreetmap.org)" copyright="OpenStreetMap and contributors" attribution="http://www.openstreetmap.org/copyright" license="http://opendatacommons.org/licenses/odbl/1-0/"><node id="939092112" visible="true" version="3" changeset="9125708" timestamp="2011-08-25T22:47:10Z" user="Raitisx" uid="105318" lat="57.0408668" lon="24.0680754"><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></node><node id="956004391" visible="true" version="5" changeset="36231114" timestamp="2015-12-28T22:52:59Z" user="AkageMuk" uid="2012081" lat="57.0299437" lon="24.1089277"><tag k="name" v="Vecmīlgrāvis"/><tag k="name:de" v="Alt-Mühlgraben"/><tag k="name:lv" v="Vecmīlgrāvis"/><tag k="name:ru" v="Вецмилгравис"/><tag k="place" v="suburb"/><tag k="wikipedia" v="lv:Vecmīlgrāvis"/><tag k="wikipedia:ru" v="Вецмилгравис"/></node><node id="1412648728" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:50Z" user="Raitisx" uid="105318" lat="57.0237064" lon="24.1172858"/><node id="1412648732" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:50Z" user="Raitisx" uid="105318" lat="57.0237837" lon="24.1146783"/><node id="1412648733" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0239283" lon="24.1201001"/><node id="1412648734" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0239694" lon="24.1120189"/><node id="1412648735" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0244130" lon="24.1218642"/><node id="1412648741" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0252736" lon="24.1235470"/><node id="1412648742" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0252901" lon="24.1068387"/><node id="1412648745" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0259421" lon="24.0865922"/><node id="1412648749" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0267091" lon="24.1003177"/><node id="1412648750" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0272530" lon="24.0901290"/><node id="1412648753" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0272650" lon="24.1261230"/><node id="1412648754" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0277863" lon="24.0940634"/><node id="1412648755" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0277928" lon="24.0850352"/><node id="1412648760" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:51Z" user="Raitisx" uid="105318" lat="57.0298488" lon="24.1289978"/><node id="1412648766" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0322322" lon="24.0795026"/><node id="1412648767" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0324695" lon="24.1317941"/><node id="1412648768" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0336179" lon="24.1289290"/><node id="1412648769" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0342914" lon="24.1256628"/><node id="1412648770" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0346037" lon="24.1223190"/><node id="1412648771" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0348498" lon="24.1188739"/><node id="1412648772" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0348667" lon="24.0758427"/><node id="1412648775" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0353858" lon="24.1167861"/><node id="1412648783" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0377249" lon="24.1087940"/><node id="1412648786" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:52Z" user="Raitisx" uid="105318" lat="57.0382325" lon="24.0717365"/><node id="1412648787" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0383366" lon="24.1072823"/><node id="1412648788" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0398108" lon="24.1061825"/><node id="1412648789" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0403684" lon="24.1061945"/><node id="1412648792" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0418628" lon="24.1028049"/><node id="1412648793" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0425852" lon="24.0987029"/><node id="1412648798" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0430687" lon="24.0645903"/><node id="1412648799" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0438158" lon="24.0914262"/><node id="1412648807" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0457390" lon="24.0602339"/><node id="1412648809" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:53Z" user="Raitisx" uid="105318" lat="57.0473897" lon="24.0573897"/><node id="1412648814" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0485238" lon="24.0617057"/><node id="1412648815" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0489709" lon="24.0779074"/><node id="1412648819" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0492422" lon="24.0800514"/><node id="1412648821" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0493233" lon="24.0747645"/><node id="1412648822" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0493467" lon="24.0661118"/><node id="1412648828" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0497404" lon="24.0808749"/><node id="1412648829" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0501426" lon="24.0720512"/><node id="1412648830" visible="true" version="1" changeset="9125708" timestamp="2011-08-25T22:45:54Z" user="Raitisx" uid="105318" lat="57.0501439" lon="24.0696934"/><node id="939092310" visible="true" version="3" changeset="9125708" timestamp="2011-08-25T22:47:11Z" user="Raitisx" uid="105318" lat="57.0299390" lon="24.0828947"><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></node><node id="2001673384" visible="true" version="2" changeset="27351748" timestamp="2014-12-09T09:08:56Z" user="AkageMuk" uid="2012081" lat="57.0379682" lon="24.1081640"/><node id="1412648777" visible="true" version="2" changeset="13788614" timestamp="2012-11-07T18:35:26Z" user="briedisUNrepshe" uid="780955" lat="57.0365649" lon="24.1126203"/><node id="1940326011" visible="true" version="2" changeset="27418924" timestamp="2014-12-12T11:12:48Z" user="AkageMuk" uid="2012081" lat="57.0454766" lon="24.0884690"/><way id="127683755" visible="true" version="3" changeset="13314024" timestamp="2012-09-30T19:10:18Z" user="iav" uid="80180"><nd ref="1412648789"/><nd ref="1412648792"/><nd ref="1412648793"/><nd ref="1412648799"/><nd ref="1940326011"/><nd ref="1412648828"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><way id="127683753" visible="true" version="2" changeset="9316551" timestamp="2011-09-16T14:24:13Z" user="Raitisx" uid="105318"><nd ref="1412648767"/><nd ref="1412648760"/><nd ref="1412648753"/><nd ref="1412648741"/><nd ref="1412648735"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><way id="127683754" visible="true" version="2" changeset="9316551" timestamp="2011-09-16T14:24:14Z" user="Raitisx" uid="105318"><nd ref="1412648735"/><nd ref="1412648733"/><nd ref="1412648728"/><nd ref="1412648732"/><nd ref="1412648734"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><way id="127683772" visible="true" version="2" changeset="9316551" timestamp="2011-09-16T14:24:15Z" user="Raitisx" uid="105318"><nd ref="1412648734"/><nd ref="1412648742"/><nd ref="1412648749"/><nd ref="1412648754"/><nd ref="1412648750"/><nd ref="1412648745"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><way id="127683719" visible="true" version="3" changeset="13788614" timestamp="2012-11-07T18:35:30Z" user="briedisUNrepshe" uid="780955"><nd ref="1412648789"/><nd ref="1412648788"/><nd ref="1412648787"/><nd ref="2001673384"/><nd ref="1412648783"/><nd ref="1412648777"/><nd ref="1412648775"/><nd ref="1412648771"/><nd ref="1412648770"/><nd ref="1412648769"/><nd ref="1412648768"/><nd ref="1412648767"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><way id="127683787" visible="true" version="2" changeset="9316551" timestamp="2011-09-16T14:24:16Z" user="Raitisx" uid="105318"><nd ref="1412648809"/><nd ref="1412648814"/><nd ref="1412648822"/><nd ref="1412648830"/><nd ref="1412648829"/><nd ref="1412648821"/><nd ref="1412648815"/><nd ref="1412648819"/><nd ref="1412648828"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><way id="80499981" visible="true" version="6" changeset="9316551" timestamp="2011-09-16T14:24:32Z" user="Raitisx" uid="105318"><nd ref="939092112"/><nd ref="1412648798"/><nd ref="1412648807"/><nd ref="1412648809"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><way id="80500002" visible="true" version="4" changeset="9316551" timestamp="2011-09-16T14:24:35Z" user="Raitisx" uid="105318"><nd ref="939092112"/><nd ref="1412648786"/><nd ref="1412648772"/><nd ref="1412648766"/><nd ref="939092310"/><nd ref="1412648755"/><nd ref="1412648745"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="source" v="Rīgas pilsētas teritorijas plānojums"/></way><relation id="1727775" visible="true" version="4" changeset="36231114" timestamp="2015-12-28T22:52:41Z" user="AkageMuk" uid="2012081"><member type="way" ref="127683755" role="outer"/><member type="way" ref="127683719" role="outer"/><member type="way" ref="127683753" role="outer"/><member type="way" ref="127683754" role="outer"/><member type="way" ref="127683772" role="outer"/><member type="way" ref="80500002" role="outer"/><member type="way" ref="80499981" role="outer"/><member type="way" ref="127683787" role="outer"/><member type="node" ref="956004391" role="admin_centre"/><tag k="admin_level" v="10"/><tag k="boundary" v="administrative"/><tag k="name" v="Vecmīlgrāvis"/><tag k="name:de" v="Alt-Mühlgraben"/><tag k="name:lv" v="Vecmīlgrāvis"/><tag k="name:ru" v="Вецмилгравис"/><tag k="type" v="boundary"/></relation></osm>';html,
body,
#map_canvas {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>
<div id="map_canvas"></div>
答案 1 :(得分：3)
这可能是“正确”的方式：
- 解析XML保存节点及其关联的ID
- 解析“way”标签，在这些段中对其进行排序
- 对“路径”路径进行端到端排序（假设相邻路径有共同点）
- 使用完成的路径创建多边形
（可能有更有效的方法）
代码段
var geocoder;
var map;
var centerPt;
var markers = [];
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(37.4419, -122.1419),
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var path = [];
var xmldata = xmlParse(xmlBoundaryData);
var nodes = xmldata.getElementsByTagName("node");
var bounds = new google.maps.LatLngBounds();
var nodeArray = [];
// get the coordinate data out of the "nodes"
for (var i = 0; i < nodes.length; i++) {
var pt = new google.maps.LatLng(nodes[i].getAttribute("lat"),
nodes[i].getAttribute("lon"));
path.push(pt);
nodeArray[nodes[i].getAttribute("id")] = pt;
var marker = new google.maps.Marker({
position: pt,
map: map,
title: "" + i
})
markers.push(marker);
bounds.extend(pt)
}
var waysArray = [];
// get the ways, putting the "nodes" in "way" order
var ways = xmldata.getElementsByTagName("way");
for (var j = 0; j < ways.length; j++) {
var waypath = [];
var nd = ways[j].getElementsByTagName("nd");
for (var i = 0; i < nd.length; i++) {
waypath.push(nodeArray[nd[i].getAttribute("ref")]);
}
waysArray.push(waypath);
var waypoly = new google.maps.Polyline({
path: waypath,
map: map,
strokeColor: "#0000FF"
})
}
// assemble the "ways" into a polygon by concatenating together at the common points
console.log("number of ways="+waysArray.length);
var polypath = [];
for (var i = 0; i < waysArray.length; i++) {
if (i == 0) {
// first "way"
console.log("way 0, ends at " + waysArray[i][0].toUrlValue(6));
for (var j = 0; j < waysArray[i].length; j++) {
polypath.push(waysArray[i][j]);
}
} else if (polypath[polypath.length - 1].equals(waysArray[i][0])) {
console.log("way " + i + ", ends at " + waysArray[i][0].toUrlValue(6));
for (var j = 1; j < waysArray[i].length; j++) {
polypath.push(waysArray[i][j]);
}
} else if (polypath[polypath.length - 1].equals(waysArray[i][waysArray[i].length - 1])) {
console.log("way " + i + " (rev), ends at " + waysArray[i][waysArray[i].length - 1].toUrlValue(6));
for (var j = waysArray[i].length - 2; j >= 0; j--) {
polypath.push(waysArray[i][j]);
}
} else {
// not adjacent to the end, try again later (push it on to the end of the array)
waysArray.push(waysArray[i]);
}
}
var polygon = new google.maps.Polygon({
map: map,
path: polypath
});
map.fitBounds(bounds);
}
google.maps.event.addDomListener(window, "load", initialize);
function xmlParse(str) {
if (typeof ActiveXObject != 'undefined' && typeof GetObject != 'undefined') {
var doc = new ActiveXObject('Microsoft.XMLDOM');
doc.loadXML(str);
return doc;
}
if (typeof DOMParser != 'undefined') {
return (new DOMParser()).parseFromString(str, 'text/xml');
}
return createElement('div', null);
}
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body,
#map_canvas {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>
<div id="map_canvas"></div>
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