Leaflet 基于当前边界框将GeoJSON图层从Geoserver加载到传单地图
目前,我的地图上有超过25000个点。当我加载所有点时,地图速度非常慢。因此,我只想在特定的缩放级别和边界框(用户视图)加载数据。如何使用当前代码实现这一点Leaflet 基于当前边界框将GeoJSON图层从Geoserver加载到传单地图,leaflet,geojson,geoserver,bounding-box,Leaflet,Geojson,Geoserver,Bounding Box,目前,我的地图上有超过25000个点。当我加载所有点时,地图速度非常慢。因此,我只想在特定的缩放级别和边界框(用户视图)加载数据。如何使用当前代码实现这一点 var map = new L.Map('map', {center: new L.LatLng(54.0000, -125.0000), zoom: 5}); var googleLayer = new L.Google('ROADMAP'); map.addLayer(googleLayer); function
var map = new L.Map('map', {center: new L.LatLng(54.0000, -125.0000), zoom: 5});
var googleLayer = new L.Google('ROADMAP');
map.addLayer(googleLayer);
function BoundingBox(){
var bounds = map.getBounds().getSouthWest().lng + "," + map.getBounds().getSouthWest().lat + "," + map.getBounds().getNorthEast().lng + "," + map.getBounds().getNorthEast().lat;
return bounds;
}
var geoJsonUrl ="http://localhost:8080/geoserver/Wells/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=Wells:bc_well_data_wgs&maxFeatures=25&outputFormat=text/javascript&format_options=callback:loadGeoJson";
var geojsonLayerWells = new L.GeoJSON();
function loadGeoJson(data) {
console.log(data);
geojsonLayerWells.addData(data);
};
$.ajax({
url: geoJsonUrl,
dataType : 'jsonp',
success: loadGeoJson
});
map.on('moveend', function(){
if(map.getZoom() >= 18){
map.removeLayer(geojsonLayerWells);
}
if(map.getZoom() < 18){
map.addLayer(geojsonLayerWells);
}
console.log(map.getZoom());
console.log(BoundingBox());
});
var-map=newl.map('map',{center:newl.LatLng(54.0000,-125.0000),zoom:5});
var googleLayer=newl.Google(“路线图”);
map.addLayer(googleLayer);
函数边界框(){
var bounds=map.getBounds().getSouthWest().lng+,“+map.getBounds().getSouthWest().lat+”,“+map.getBounds().getNorthwest().lng+”,“+map.getBounds().getNorthwest().lat;
返回边界;
}
变量geoJsonUrl=”http://localhost:8080/geoserver/Wells/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=Wells:bc_well_data_wgs&maxFeatures=25&outputFormat=text/javascript&format_options=callback:loadGeoJson";
var geojsonLayerWells=新的L.GeoJSON();
函数loadGeoJson(数据){
控制台日志(数据);
geojsonLayerWells.addData(数据);
};
$.ajax({
网址:geoJsonUrl,
数据类型:“jsonp”,
成功:loadGeoJson
});
map.on('moveend',function(){
如果(map.getZoom()>=18){
地图移除层(geojsonLayerWells);
}
if(map.getZoom()<18){
map.addLayer(geojsonLayerWells);
}
log(map.getZoom());
log(BoundingBox());
});
WFS没有缩放级别或缩放的概念,即WMS,但它支持基于bbox加载数据子集(请参见WFS示例)
也就是说,GeoServer不支持WMS的JSon,请参阅
不过,这可能是一件好事
西蒙妮。你的代码看起来不错。只需在url中传递bbox
var bbox = BoundingBox();
var geoJsonUrl ="http://localhost:8080/geoserver/Wells/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=Wells:bc_well_data_wgs&maxFeatures=25&outputFormat=json&bbox="+bbox+"&format_options=callback:loadGeoJson";
这就是我想到的,当我检查加载了多少对象时,它表示4000,这意味着它也加载了边界框之外的所有内容
//loads the google map
var map = new L.Map('map', {center: new L.LatLng(54.0000, -125.0000), zoom: 5});
var googleLayer = new L.Google('ROADMAP'); // Possible types: SATELLITE, ROADMAP, HYBRID
map.addLayer(googleLayer);
//Gets the current bounding box lat and long
function BoundingBox(){
var bounds = map.getBounds().getSouthWest().lng + "," + map.getBounds().getSouthWest().lat + "," + map.getBounds().getNorthEast().lng + "," + map.getBounds().getNorthEast().lat;
return bounds;
}
//loads the well markers
wellmaxzoom = 8;
var geoJsonUrl ="http://localhost:8080/geoserver/cite/ows? service=WFS&version=1.0.0&request=GetFeature&typeName=cite:bc_well_data_wgs&maxFeatures=4000&outputFormat=application/json";
var geojsonLayerWells = new L.GeoJSON();
function loadGeoJson(data) {
console.log(data);
geojsonLayerWells.clearLayers();
geojsonLayerWells.addData(data);
};
$.ajax({
url: geoJsonUrl + "&bbox=" + BoundingBox(),
dataType : 'json',
jsonpCallback: 'loadGeoJson',
success: loadGeoJson,
});
map.on('moveend', function(){
if(map.getZoom() > wellmaxzoom){
map.addLayer(geojsonLayerWells);
}
console.log(map.getZoom());
console.log(BoundingBox());
});
我就是这样解决的,改变了周围的一切
var wellmaxzoom = 11;
var geojsonLayerWells = new L.GeoJSON();
function loadGeoJson(data) {
console.log(data);
geojsonLayerWells.addData(data);
map.addLayer(geojsonLayerWells);
};
map.on('moveend', function(){
if(map.getZoom() > wellmaxzoom){
var geoJsonUrl ='http://localhost:8080/geoserver/cite/ows';
var defaultParameters = {
service: 'WFS',
version: '1.0.0',
request: 'getFeature',
typeName: 'cite:bc_well_data_wgs',
maxFeatures: 3000,
outputFormat: 'application/json'
};
var customParams = {
bbox: map.getBounds().toBBoxString(),
};
var parameters = L.Util.extend(defaultParameters, customParams);
console.log(geoJsonUrl + L.Util.getParamString(parameters));
$.ajax({
url: geoJsonUrl + L.Util.getParamString(parameters),
datatype: 'json',
jsonCallback: 'getJson',
success: loadGeoJson
});
}else{
map.removeLayer(geojsonLayerWells);
};
});
这适用于geoserver2.6.2和传单0.7.3。顺便说一句,SF city的以下bbox编号是通过传单的本机功能获得的
var yourMap = L.map('map').setView([37.7749295, -122.4194155], 17);
yourMap.getBounds().toBBoxString();
无限制:(返回多个)
地图边界限制(返回当前覆盖)
我在$.ajax函数中将它添加到我的url中,当我添加5000作为max功能时,它仍然运行缓慢,并且我放大到非常接近。有没有办法查看在特定缩放时调用了多少对象?如果您的BoundingBox()函数给出了正确的bbox,那么您应该得到该范围内的数据。我想说的是,对于测试,在geoserver管理工具层预览中的url,从函数中添加bbox calculate并查看结果。WMS也没有缩放比例的概念,这就是WMTS