如何使用google map api在半径内进行客户经纬度地点搜索？ [英] How to do customer Lat-Long place search in radius using google map api?

问题描述

我有一套先前获得的纬度&经度使用GIS应用程序的各个地方。
我要做的是......我想在地图上显示这些获得的经纬度，作为从当前位置到特定半径的标记。

I have set of previously obtained latitude & longitude using GIS application for various places. What i have to do is... I want to show these obtained lat-long on map as marker from my current location to certain radius.

说如果我的当前位置是-33.8665433，151.1956316和半径1000，那么我想显示所有获得的经纬度为该范围内的标记。

Say if my current location is -33.8665433, 151.1956316 and radius 1000 then I want to show all obtained lat-long as marker falling in this range.

这： https://google-developers.appspot.com/maps/documentation/javascript/examples /地点搜索有助于特定的地点类型。我没有预定义类型。

This : https://google-developers.appspot.com/maps/documentation/javascript/examples/place-search helps for specific defined place type. I don't have predefined type.

如何解决此问题？

感谢您的提前。

推荐答案

AppEngine上的地理查询问题是数据存储将不等式查询限制为最多一个属性。即你不能在lat和lon上执行不等式查询，这基本上限制了geo-proximity查询。

The problem with geo-queries on AppEngine is that datastore limits inequality queries to at most one property. I.e. you can not perform an inequality query on both lat and lon , which basically limits the geo-proximity queries.

解决方案是 geo-hash 您的数据：将地图拆分为离散网格并为每个象限提供一个ID。然后用适当的象限ID标记所有地方。

The solution is to geo-hash your data: break the map into discrete grid and give each quadrant an ID. Then also mark all places with the appropriate quadrant ID.

AppEngine上的geo-hash 。还有一个Java库可以对AppEngine执行地理哈希处理： https://code.google.com/ p / javageomodel /

An example of geo-hash on AppEngine. There is also a java library that performs geo-hashing on AppEngine: https://code.google.com/p/javageomodel/

这篇关于如何使用google map api在半径内进行客户经纬度地点搜索？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！