使用esri javascript api计算两点之间的距离

Question

我们正在构建一个使用esri地图的Web应用程序。我想要做的是计算两点之间的距离。这些点的坐标位于两个独立的json对象中。接下来，我通过解析来自这两个json对象的纬度和经度值来生成两个esri点。 Esri点需要空间参考，因此我将mapView的空间参考设置为两点的空间参考。

问题：当我选择两个点时，它会完全重写其中一个点的纬度和经度。这导致两点的荒谬计算。

这就是我尝试过的

//calling the distance function

distance = this.distanceCalculator(incidentCenter, residence);

//distance calc function
  private distanceCalculator(firstPt, secondPt): any {
    //this.measureLayer.removeAll();

    // When calculating the distance betweeen two points , we need to decypher the points coming in and attach a spatial reference.
    const pointA: esri.Point = new this.Point({
      spatialReference: this.mapView$.value.spatialReference,
      latitude: firstPt.latitude,
      longitude: firstPt.longitude
    });

    //so whats happening here is that 
    const pointB: esri.Point = new this.Point({
      spatialReference: this.mapView$.value.spatialReference,
      latitude: secondPt.latitude,
      longitude: secondPt.longitude
    });


    console.log("Point a and B");
    console.log("point a: ", pointA);
    console.log("point b: ", pointB);

    // Next we call the GemoetryEngine distance function and calculate the distance between the two points.

    try {
      const miles = this.GeometryEngine.distance(pointA, pointB, 'kilometers');
      const kms = miles * this.MilesToKm;
      return kms.toFixed(2);
    } catch (e) {
      this.logger.error('Error indistanceCalculator ', e);
    }
  }

截图

选择这两个点后，我注意到第二个点的纬度/经度值不正确。