# 地理空間函數

這些函數用於在地圖視覺化中處理地理空間資料。Qlik Sense 按照地理空間資料的 GeoJSON 規格並支援下列內容：

* 點
* 線串
* 多邊形
* 多個多邊形

如需更多關於 GeoJSON 規格的資訊，請參閱：

[GeoJSON.org](http://geojson.org/)

[地圖](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Visualizations/Map/Map.htm)

使用每個函數中的下拉式功能表，以查看每個函數的簡要描述及語法。按一下語法描述中的函數名稱，以取得進一步詳細資料。

有兩種類型的地理空間函數：彙總和非彙總。

彙總函數以幾何值集 (點或區域) 作為輸入值，並傳回單一幾何值。例如，可以合併多個區域，可以在地圖上繪製彙總的單一邊界。

非彙總函數採用一個單一幾何值，並傳回一個幾何值。例如，對於函數 GeoGetPolygonCenter()，如果將某個區域的邊界幾何值設為輸入值，將傳回該區域中心的點幾何值 (經度和緯度)。

以下為彙總函數：

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoAggrGeometry

GeoAggrGeometry() 用來將許多區域彙總至較大區域，例如，將許多子區域彙總至某個區域。

[**GeoAggrGeometry**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoAggrGeometry.htm)(field\_name)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoBoundingBox

GeoBoundingBox() 用來將幾何圖形彙總至某個區域，並計算包含所有座標的最小邊界框。

[**GeoBoundingBox**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoBoundingBox.htm)(field\_name)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoCountVertex

GeoCountVertex() 用來尋找多邊幾何圖形包含的頂點數目。

[**GeoCountVertex**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoCountVertex.htm)(field\_name)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoInvProjectGeometry

GeoInvProjectGeometry() 用來將幾何圖形彙總至某個區域，並套用投射的反向。

[**GeoInvProjectGeometry**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoInvProjectGeometry.htm)(type, field\_name)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoProjectGeometry

GeoProjectGeometry() 用來將幾何圖形彙總至某個區域，並套用投射。

[**GeoProjectGeometry**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoProjectGeometry.htm)(type, field\_name)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoReduceGeometry

GeoReduceGeometry() 用來減少幾何圖形的頂點數目，並將區域數目彙總至一個區域，但是仍顯示個別區域的邊界線。

[**GeoReduceGeometry**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoReduceGeometry.htm)(geometry)

  
以下為非彙總函數：

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoGetBoundingBox

GeoGetBoundingBox() 用在指令碼與圖表運算式中，可計算包含幾何圖形所有座標的最小地域邊界框。

[**GeoGetBoundingBox**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoGetBoundingBox.htm)(geometry)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoGetPolygonCenter

GeoGetPolygonCenter() 用在指令碼與圖表運算式中，可計算及傳回幾何圖形的中心點。

[**GeoGetPolygonCenter**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoGetPolygonCenter.htm)(geometry)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoMakePoint

GeoMakePoint() 用在指令碼及圖表運算式中，以在緯度和經度中建立一個點並予以標記。

[**GeoMakePoint**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoMakePoint.htm)(lat\_field\_name, lon\_field\_name)

[](https://help.qlik.com/en-US/sense/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/geospatial-functions.htm)

#### GeoProject

GeoProject() 用在指令碼與圖表運算式中，可將投射套用至幾何圖形。

[**GeoProject**](https://help.qlik.com/zh-TW/sense/November2024/Subsystems/Hub/Content/Sense_Hub/Scripting/GeospatialFunctions/GeoProject.htm)(type, field\_name)