cesium结合geoserver利用WFS服务实现图层编辑(附源码下载)

Posted 2021-03-02 giserhome

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服务实现图层编辑功能
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来达到图层编辑记录的目的。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

//绘制geojson图层样式
var geoJsonStyle = {
stroke: Cesium.Color.YELLOW,
strokeWidth: 3,
fill: Cesium.Color.YELLOW.withAlpha(0.1)
};
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 geometry = data.features[0].geometry;
//var content = ‘名称:‘+properties.estate_num+‘</br>备注:‘+properties.holder_nam;
var content = ‘<span>名称:</span><input type="text" id="estate_num" value = "‘+properties.estate_num+‘" /></br><span>备注:</span><input type="text" id="holder_nam" value = "‘+properties.holder_nam+‘" /></br><button type="button" id="editBtn">编辑</button>‘;
$("#infowindow").show();
$("#infowindow").empty();
$("#infowindow").append(content);
$("#editBtn").click(function(){
//console.log(‘编辑按钮点击事件‘);
if(id)
{
//构造polygon
var polygon = ‘‘;
var data = geometry.coordinates[0][0];
for(var i=0;i<data.length;i++){
var item = data[i];
polygon += item[0] + ‘,‘ + item[1] + ‘ ‘ ;
}
polygon += data[0][0] + ‘,‘ + data[0][1];
//只编辑属性信息，默认图形信息不变，感兴趣的，读者你们可自行编辑图形变化信息，这里预留图形参数传值了的
editLayers(id,polygon,$("#estate_num").val(),$("#holder_nam").val(),callbackEditLayersWFSService);
}
});
}
else{
//clearMap();
$("#infowindow").hide();
}
}
/*
* 绘制图形函数
*/
function loadGeojsonLayer(geojson){
var promise = Cesium.GeoJsonDataSource.load(geojson,geoJsonStyle);
promise.then(function(dataSource) {
viewer.dataSources.add(dataSource);
//viewer.zoomTo(dataSource);
}).otherwise(function(error){
window.alert(error);
});
}
/*
* 清空绘制图形函数
*/
function clearGeojsonLayer(){
viewer.dataSources.removeAll();
}
 
function clearMap(){
if (drawTool) {
drawTool.destroy();
}
clearGeojsonLayer();
}
/*图层编辑
*@method editLayers
*@param polygon 图形
*@param fid 记录fid值
*@param fieldValue1 字段1值
*@param fieldValue2 字段2值
*@return callback
*/
function editLayers(fid,polygon,fieldValue1,fieldValue2, callback){
var xml = ‘<wfs:Transaction service="WFS" version="1.0.0" xmlns:opengis="http://webgis.com" xmlns:wfs="http://www.opengis.net/wfs" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" 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 += ‘<wfs:Update typeName="WebGIS:testLayer">‘;
xml += ‘<wfs:Property>‘;
xml += ‘<wfs:Name>the_geom</wfs:Name>‘;
……
…… 

}

几点说明：
1.WebGIS，geoserver工作区；
2.testLayer，操作图层名称；
3.fid，操作图层的默认固有属性字段。
4.estate_num，holder_nam，操作图层属性字段。
图层编辑回调函数，操作成功或者失败，可以在网页的控制台网络看请求结果

完整demo源码见小专栏文章尾部：小专栏

文章尾部提供源代码下载，对本专栏感兴趣的话，可以关注一波