我有一个KML文件，列出了每个国家/地区的多边形坐标。我有一个纬度和经度对，我想检查这个位置所在的国家。我想以最有效的方式做到这一点。
我认为解析KML文件并逐个搜索会给用户带来痛苦，所以我假设我应该能够将这些国家及其坐标存储在离线状态（我希望我的应用程序脱机工作）数据库所以我每次启动Android应用程序时都不需要解析KML文件。
我有两个问题：
以下是一个如何为单个国家/地区组织KML文件的示例：
<Placemark>
<name>Ukraine</name>
<description><![CDATA[<table><tr><td><FeatureID>194</FeatureID></td><td>
<GMI_CNTRY>UKR</GMI_CNTRY></td><td>
<REGION>Europe</REGION></td></tr><tr><td colspan=3>
<a href="http://www.imageshack.us"><img src="http://img317.imageshack.us/img317/3765/ukraine4gw.jpg" border="0" width="250" alt="Image Hosted by ImageShack.us" /></a><br><a href="https://www.cia.gov/library/publications/the-world-factbook/geos//up.html">CIA World Factbook: UP</a></td></tr></table>]]></description>
<Style>
<PolyStyle>
<color>aaffffff</color>
<colorMode>random</colorMode>
</PolyStyle>
</Style>
<Polygon>
<outerBoundaryIs>
<LinearRing>
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答案 0 :(得分：1)
2。预先计算每个国家/地区的边界框。当位置在边界框内时，然后加载该国家/地区的多边形并执行更准确的测试。您只需要加载并检查一些多边形。然后，您甚至可以根据需要从KML文件中加载多边形。
答案 1 :(得分：0)
我认为存储这些坐标的最佳方法是为每个只有2D float标签的国家/地区创建一个非常简单的类（第一个D用于地理点编号，第二个D的大小为2，包含lat或long）
使用您的坐标列表，您可以创建一个Region列表（使用Path和Region.setPath(Path, Region)）并调用Region.contain(X, Y)来查看X，Y是否位于内部你的国家。