目前,我的 map 有超过 25000 个点。当我加载所有点时, map 非常慢。因此,我想仅在特定的缩放级别和边界框(用户 View )下加载数据。我怎样才能用我当前的代码实现这一点?
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 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());
});
最佳答案
这是我解决这个问题的方法,改变了一切。
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);
};
});
关于leaflet - 根据当前边界框将 GeoJSON 图层从 Geoserver 加载到 Leaflet Map,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25187937/