GeoServer通過WFS服務(wù)獲取Feature

根據(jù)官方文檔總結(jié)出如何獲取feature。

執(zhí)行獲取feature請求時壶谒，需要指定namespace:featuretype.

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype

namespace:featuretype在我們的geoserver主頁的layer perview中甚淡。如下圖所示

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示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0

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根據(jù)id獲取feature

設(shè)置featureID

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype&
  featureID=feature

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&featureID=0.134

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查詢指定數(shù)量feature

設(shè)置count

WFS2.0.0支持

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype&
  count=N

WFS2.0.0以下支持

http://example.com/geoserver/wfs?
  service=wfs&
  version=1.1.0&
  request=GetFeature&
  typeName=namespace:featuretype&
  maxFeatures=N

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&count=3

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按某屬性順序查詢

使用該字段sortBy=attribute诫给。attribute可以換成要素中的屬性嫂丙。

http://example.com/geoserver/wfs?
   service=wfs&
   version=2.0.0&
   request=GetFeature&
   typeNames=namespace:featuretype&
   count=N&
   sortBy=attribute

該例子使用sortBy=NAME_2查詢

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&count=3&sortBy=NAME_2

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按某屬性排序（升序或降序）查詢

在sortBy=attribute+D加一個參數(shù)

• sortBy=attribute+A 升序
• sortBy=attribute+D 降序

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype&
  count=N&
  sortBy=attribute+D

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&count=3&sortBy=NL_NAME_1+D

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獲取某個屬性

可以使用propertyName=attribute指定單獨或者幾個屬性，只顯示該屬性內(nèi)容

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype&
  propertyName=attribute

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&propertyName=NL_NAME_1

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只顯示指定要素的指定屬性

同時指定這兩個值featureID 和 propertyName

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype&
  featureID=feature&
  propertyName=attribute

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&featureID=0.134&propertyName=NL_NAME_1

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查詢多個屬性

在propertyName使用,分隔

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype&
  featureID=feature&
  propertyName=attribute1,attribute2

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&featureID=0.134&propertyName=NL_NAME_1,NL_NAME_2

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查詢指定區(qū)域內(nèi)所有的feature

上面的GetFeature操作是利用非空間參數(shù)進行查詢惶翻。接下來是根據(jù)feature的幾何性質(zhì)進行查詢杨箭。比如空間位置∫依欤可以通過BBOX查詢指定區(qū)域內(nèi)的要素级历。

這里介紹一個概念 bounding box (BBOX) 。指定的一個區(qū)域

BBOX的參數(shù)

BBOX的參數(shù)是bbox=a1,b1,a2,b2,[crs],a1, b1, a2, b2表示的是坐標(biāo)值(經(jīng)過測試叭披，ab分別代表緯度精度且必須滿足 a2>a1, b2>b1)寥殖， crs 代表的是坐標(biāo)參考系統(tǒng)(Coordinate Reference System)

http://example.com/geoserver/wfs?
  service=wfs&
  version=2.0.0&
  request=GetFeature&
  typeNames=namespace:featuretype&
  srsName=CRS
  bbox=a1,b1,a2,b2

示例

http://localhost:8080/geoserver/cesium/wms?service=wfs&version=2.0.0&request=GetFeature&typeNames=cesium:0&bbox=29.81506157,115.70956848,29.82217026,115.71960449

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Transaction(重點，以后講解)

該功能支持對feauter進行增刪改查操作,具體操作可以看官方參考涩蜘，或者GeoServer通過WFS對feature實現(xiàn)增刪改查