計算輸入幾何圖形的麵積。與 geodesicArea() 不同,planarArea() 使用投影坐標執行此計算,並且不考慮地球曲率。當使用空間參考為 WGS84 (wkid: 4326) 或 Web Mercator 的輸入幾何時,最佳做法是使用 geodesicArea() 計算麵積。如果輸入幾何圖形具有 Web 墨卡托以外的投影坐標係,請改用 planarArea()。
參數:
類型 說明 geometry Polygon輸入多邊形。
unit ArealUnits可選的 返回值的計量單位。默認為輸入幾何的單位。
返回:
類型 說明 Promise<Number> 解析後,響應是輸入幾何的區域。 例子:
// Returns the numeric area of the given polygon const area = await geometryEngineAsync.planarArea(boundaryPolygon, "square-miles");
基本信息
以下是所在類或對象的基本信息。
AMD:
require(["esri/geometry/geometryEngineAsync"], (geometryEngineAsync) => { /* code goes here */ });
ESM:
import * as geometryEngineAsync from "@arcgis/core/geometry/geometryEngineAsync";
對象:
esri/geometry/geometryEngineAsync
自從:用於 JavaScript 4.0 的 ArcGIS API
用法說明
geometryEngineAsync.planarArea
函數(或屬性)的定義如下:
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注:本文由純淨天空篩選整理自arcgis.com大神的英文原創作品 geometryEngineAsync.planarArea。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。