如何获取图层的几何类型？

如何解决如何获取图层的几何类型？

我正在制作这样的图层：

// Vector source for geoserver services
const vectorSource = (layer) => {
  return new ol.source.Vector({
    format: new ol.format.GeoJSON(),url: (extent) => {
      return (`http://localhost:8080/geoserver/Bugra/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=Bugra:${layer}&outputFormat=application/json&srsname=EPSG:3857&bbox=${extent.join(',')},EPSG:3857`);
    },strategy: ol.loadingstrategy.bbox,})
};

，然后再使用一个：

// Layer creating class
class LayerCreator {
  constructor(
    lyrName,lyrGeoServerName,lyrStrokeColor,lyrStrokeWidth,lyrFillColor,lyrOpacity,lyrPointRadius,lyrMinZoom,lyrMaxZoom,lyrLabelField,lyrFontFamily,lyrFontFillColor,lyrFontStrokeColor,lyrFontStrokeWidth,lyrFontBold,lyrFontSize,lyrFontPlacement,lyrFontOffsetY) {

    return new ol.layer.Vector({
      className: `${lyrName}-${lyrGeoServerName}`,source: vectorSource(lyrGeoServerName),style: function text(feature) {
        return new ol.style.Style({
          stroke: new ol.style.Stroke({
            color: lyrStrokeColor,width: lyrStrokeWidth,}),fill: new ol.style.Fill({
            color: lyrFillColor
          }),image: new ol.style.Circle({
            radius: lyrPointRadius,fill: new ol.style.Fill({
              color: lyrFillColor
            }),stroke: new ol.style.Stroke({
              color: lyrStrokeColor,})
          }),text: new ol.style.Text({
            text: feature.get(lyrLabelField),font: `${lyrFontBold} ${lyrFontSize}px ${lyrFontFamily}`,fill: new ol.style.Fill({
              color: lyrFontFillColor,stroke: new ol.style.Stroke({
              color: lyrFontStrokeColor,width: lyrFontStrokeWidth,placement: lyrFontPlacement,offsetY: lyrFontOffsetY
          }),})
      },opacity: lyrOpacity,minZoom: lyrMinZoom,maxZoom: lyrMaxZoom,});
  }
}

问题是，我得到了一个Draw小部件，并且您知道它需要一个“ type”值才能知道它将创建的几何类型。我得到了一个与上面创建的所有10层组合框。它们是ol.layer.Vector类型的对象。因此，我必须根据我从组合框中选择的图层的几何类型来动态更改Draw Widget的“类型”值。如果它的类型为“ MultiPolygon”，则必须将其作为“类型：“ MultiPolygon””发送给Draw小部件，但我无法从ol.layer.Vector对象中获取几何类型。

您能帮我吗？

ui

解决方法

麦克再次回答了这个问题。

layer.getSource（）。getFeatures（）[0] .getGeometry（）。getType（）为您提供图层的几何类型（因为图层可以混合使用类型）

,

如果您想正确执行此操作，可以提出一个DescribeFeature请求，该请求将为您提供要素类型的完整架构，包括几何类型。

例如：

http://localhost:8080/geoserver-2.17.2/ows?service=wfs&version=1.1.0&request=DescribeFeatureType&typeName=topp:states

返回：

<?xml version="1.0" encoding="UTF-8"?><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" xmlns:topp="http://www.openplans.org/topp" elementFormDefault="qualified" targetNamespace="http://www.openplans.org/topp">
  <xsd:import namespace="http://www.opengis.net/gml" schemaLocation="http://localhost:8080/geoserver-2.17.2/schemas/gml/3.1.1/base/gml.xsd"/>
  <xsd:complexType name="statesType">
    <xsd:complexContent>
      <xsd:extension base="gml:AbstractFeatureType">
        <xsd:sequence>
          <xsd:element maxOccurs="1" minOccurs="0" name="the_geom" nillable="true" type="gml:MultiSurfacePropertyType"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="STATE_NAME" nillable="true" type="xsd:string"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="STATE_FIPS" nillable="true" type="xsd:string"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="SUB_REGION" nillable="true" type="xsd:string"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="STATE_ABBR" nillable="true" type="xsd:string"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="LAND_KM" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="WATER_KM" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="PERSONS" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="FAMILIES" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="HOUSHOLD" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="MALE" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="FEMALE" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="WORKERS" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="DRVALONE" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="CARPOOL" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="PUBTRANS" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="EMPLOYED" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="UNEMPLOY" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="SERVICE" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="MANUAL" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="P_MALE" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="P_FEMALE" nillable="true" type="xsd:double"/>
          <xsd:element maxOccurs="1" minOccurs="0" name="SAMP_POP" nillable="true" type="xsd:double"/>
        </xsd:sequence>
      </xsd:extension>
    </xsd:complexContent>
  </xsd:complexType>
  <xsd:element name="states" substitutionGroup="gml:_Feature" type="topp:statesType"/>
</xsd:schema>

因此该层包含gml:MultiSurfacePropertyType或对您和我来说都是MultiPolygons。