OSM到Google地图多边形 [英] OSM to Google Maps polygons
本文介绍了OSM到Google地图多边形的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想在Google地图上使用
标记正确显示'cos坐标顺序对他们来说并不重要，但是多边形会混乱'错误的坐标顺序我从OSM数据中复制出来。
所以，如何提取（或手动排序）OSM节点的坐标是否正确？
解决方案
这可能是正确做到这一点：
- 通过XML进行解析，保存节点及其关联的ID
- way标签在这些区段内对它们进行排序
- 命令路径路径首尾相连（假定相邻路径有一个共同点）
- 用完整路径创建一个多边形
（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 = []; （var i = 0; i< nodes.length; i ++）{var pt = new google.maps.LatLng（nodes [i] .getAttribute（lat））//获取坐标数据从节点 ，节点[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 = []; //获取方法，将节点按方式顺序排列var ways = xmldata.getElementsByTagName（way）; for（var j = 0; j
html，body，＃map_canvas {height：100％;宽度：100％; margin：0px; < script src =https：//
I want to draw a city district area on Google Maps using Polygon class and an array of lat/lng coordinates.
OpenStreetMap provides me all data I need — if I type some district name I can get useful data in OSM XML format, for example OSM drawn polygon of "Vecmilgravis" district in Riga, Latvia and it's data in OSM XML format.
The problem is all those node nodes are sorted in some weird order, so if I just extract all lat and lng pairs and make an coordinates array for Google Maps Polygon class I see not what I've expected:
Markers are displayed correctly 'cos coordinates order is not important for them, but polygon is messed up 'cos of wrong coordinates order I copypasted from OSM data.
So, how do I extract (or sort manually) OSM nodes coordinates in right order?
解决方案
This is probably the "right" way to do it:
- parse through the XML save the nodes with their associated ids
- parse through the "way" tags to order them within those segments
- order the "way" paths end to end (assume there is a common point for adjacent ways)
- create a polygon with the completed path
(there might be a more efficient way to do it)
code snippet:
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);
}
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" 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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>
这篇关于OSM到Google地图多边形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！
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