Google App Engine 地理哈希 [英] Google App Engine Geohashing

问题描述

我正在使用 GWT 和 App Engine 编写一个网络应用程序.我的应用程序需要根据纬度、经度发布和查询项目.

I am writing a web application using GWT and App Engine. My application will need to post and query items based on their latitude, longitude.

由于 google 的分布式数据库设计，您不能简单地查询一组不等式.相反，他们建议进行地理散列.该方法在此页面上进行了描述.

As a result of google's distributed database design you can't simple query a set of inequalities. Instead they suggest doing geohashing. The method is described on this page.

http://code.google.com/appengine/articles/geosearch.html

本质上，您预先计算了一个边界框，以便您可以查询已使用该边界框标记的项目.

Essentially you pre compute a bounding box so that you can query items that have been tagged with that bounding box.

我不明白这个过程的一部分.切片"属性是什么意思?

There is one part of the process that I don't understand. What does the "slice" attribute mean?

感谢您的帮助！

推荐答案

Geomodel的完整java移植请看http://code.google.com/p/javageomodel/.

For a complete java portage of Geomodel, please see http://code.google.com/p/javageomodel/.

有一个demo类来教你如何使用它.

There is a demo class to explain you how to use it.

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