坐标的高程图 [英] Graph of elevation from coordinations

问题描述

我想问您有关交互式地图和地理服务的一件事.我需要从协调点获取海拔高度并绘制高程图.在Google地图中，它看起来像这样:

I want ask you to one thing about interactive map and geo service. I need to get altitude from my coordinations points and build graph of elevation. In google maps it looks like this:

https://developers.google.com/maps/documentation/javascript/examples/elevation-paths

我没有找到任何例子.我该如何解决这个问题?

I didn't found any example for this. How can I solve this problematic?

非常感谢.最好的问候彼得·托马塞克(Petr Tomasek)

Thank you very much. Best regards Petr Tomasek

推荐答案

您可以通过此处指定 routeRequestParams 更改为 true ，如以下代码段所示:

You can build a similar elevation graph via the HERE RoutingService JS API by specifying the value of returnelevation of the routeRequestParams to true like in this snippet:

var router = platform.getRoutingService();
var routeRequestParams = {
  mode: 'fastest;car',
  representation: 'display',
  waypoint0: '{lat, lng}', // Start of route
  waypoint1: '{lat, lng}', // End of route
  returnelevation: true
};
var onResult = function(result) {
  var route = result.response.route[0];
  /* Now, altitudes are the third values of the each shape point.
     Note: Shape points returned as strings.  */
  var elevation_list = route.shape.map(x => parseFloat(x.split(",")[2]));
  /* Now you can use the elevation_list as input data to 
     draw your elevation graph with any graph tool 
  */
};
var onError = function(error) {
  console.log(error);
};

router.calculateRoute(
  routeRequestParams,
  onResult,
  onError
);

使用高程值，您可以使用任何JS图形库绘制高程图.检出路由API: https://developer.here.com/documentation/maps/topics/routing.html

With the elevation values you can draw your elevation graph with any JS graph library. Checkout the routing API: https://developer.here.com/documentation/maps/topics/routing.html

这篇关于坐标的高程图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！