cesium结合geoserver利用WFS服务实现图层删除(附源码下载)

前言

cesium 官网的api文档介绍地址cesium官网api，里面详细的介绍 cesium 各个类的介绍，还有就是在线例子：cesium 官网在线例子，这个也是学习 cesium 的好素材。

内容概览

1.cesium结合geoserver利用WFS服务实现图层删除功能
2.源代码demo下载

效果图如下：

本篇主要是在上一篇cesium结合geoserver利用WFS服务实现图层新增(附源码下载)基础上实现的，cesium通过调用geoserver发布的地图服务WFS来达到图层删除记录的目的。与GeoServer的WFS进行基于Rest交互关键就在于请求参数，值得注意的是这些请求最好采用POST方法发送。查询可以采用json，但增加，删除，修改都只能采用XML形式Transaction

• 部分核心代码，完整的见源码demo下载

var geoserverUrl = 'http://localhost:8080/geoserver/WebGIS';
var image_Source = new Cesium.UrlTemplateImageryProvider({
//url: 'http://mt0.google.cn/vt/lyrs=t,r&hl=zh-CN&gl=cn&x={x}&y={y}&z={z}',
//url: 'https://server.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}',
url: "http://map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/{z}/{y}/{x}",
//tilingScheme : new Cesium.GeographicTilingScheme(),
credit: ''
});
var viewer = new Cesium.Viewer('map', {
geocoder: false,
homeButton: false,
sceneModePicker: false,
fullscreenButton: false,
vrButton: false,
baseLayerPicker: false,
infoBox: false,
selectionIndicator: false,
animation: false,
timeline: false,
shouldAnimate: true,
navigationHelpButton: false,
navigationInstructionsInitiallyVisible: false,
imageryProvider: image_Source
});

//加载geoserver wms服务
var wms = new Cesium.WebMapServiceImageryProvider({
url: geoserverUrl+'/wms',
layers: 'WebGIS:testLayer',
parameters: {
service : 'WMS',
format: 'image/png',
transparent: true,
}
});
viewer.imageryLayers.addImageryProvider(wms);

viewer._cesiumWidget._creditContainer.style.display = "none";
viewer.scene.globe.enableLighting = false;
//viewer.scene.globe.depthTestAgainstTerrain = true;
viewer.scene.globe.showGroundAtmosphere = false;

viewer.camera.flyTo({
destination : Cesium.Cartesian3.fromDegrees(113.90271877, 22.95186415,30000.0)
});

var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
var ellipsoid = viewer.scene.globe.ellipsoid;
handler.setInputAction(function (movement) {
//通过指定的椭球或者地图对应的坐标系，将鼠标的二维坐标转换为对应椭球体三维坐标
cartesian = viewer.camera.pickEllipsoid(movement.position, ellipsoid);
if (cartesian) {
//将笛卡尔坐标转换为地理坐标
var cartographic = ellipsoid.cartesianToCartographic(cartesian);
//将弧度转为度的十进制度表示
var longitudeString = Cesium.Math.toDegrees(cartographic.longitude);
var latitudeString = Cesium.Math.toDegrees(cartographic.latitude);
var point = longitudeString + ',' + latitudeString;
queryByPoint(point,'testLayer',callbackLastQueryWFSService);
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);

/*点查图层
*@method queryByPoint
*@param point 点查
*@param typeName 图层名称
*@return null
*/
function queryByPoint(point, typeName, callback){
var filter =
'<Filter xmlns="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml">';
filter += '<Intersects>';
filter += '<PropertyName>the_geom</PropertyName>';
filter += '<gml:Point>';
filter += '<gml:coordinates>' + point + '</gml:coordinates>';
filter += '</gml:Point>';
filter += '</Intersects>';
filter += '</Filter>';
var urlString = geoserverUrl + '/ows';
var param = {
service: 'WFS',
version: '1.0.0',
request: 'GetFeature',
typeName: typeName,
outputFormat: 'application/json',
filter: filter
};
var geojsonUrl = urlString + getParamString(param, urlString);
$.ajax({
url: geojsonUrl,
async: true,
type:'GET',
dataType: 'json',
success(result) {
callback(result);
},
error(err) {
console.log(err);
}
})
}

function getParamString(obj, existingUrl, uppercase){
var params = [];
for (var i in obj) {
params.push(encodeURIComponent(uppercase ? i.toUpperCase() : i) + '=' + encodeURIComponent(obj[i]));
}
return ((!existingUrl || existingUrl.indexOf('?') === -1) ? '?' : '&') + params.join('&');
}

/*
* 点查图层回调函数
*/
function callbackLastQueryWFSService(data){
console.log('data',data);
if(data && data.features.length>0){
clearGeojsonLayer();
loadGeojsonLayer(data);
//气泡窗口显示
var properties = data.features[0].properties;
var id = data.features[0].id;
var content = '名称:'+properties.estate_num+'</br>备注:'+properties.holder_nam+'<button type="button" id="deleteBtn">删除</button>';
$("#infowindow").show();
$("#infowindow").empty();
$("#infowindow").append(content);
$("#deleteBtn").click(function(){
//console.log('删除按钮点击事件');
if(id)
{
deleteLayerRecord(id,callbackDeleteLayersWFSService);
}
});
}
else{
clearMap();
$("#infowindow").hide();
}
}

/*图层删除记录
*@method deleteLayerRecord
*@param fid 记录fid值
*@return callback
*/
function deleteLayerRecord(fid, callback){
var xml = '<Transaction xmlns="http://www.opengis.net/wfs" service="WFS" version="1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd">';
xml += '<Delete typeName="WebGIS:testLayer">';
……

更多详情见下面链接文章：

小专栏此文章

文章提供源码，对本专栏感兴趣的话，可以关注一波