美国所有州的 iOS 覆盖(MKPolygon)数据?

问题描述

在 的 SW15" rel="nofollow noreferrer">在地图上显示叠加层 部分iOS 开发者库 Location Awareness Programming Guide，有一个示例显示覆盖科罗拉多州的填充和描边覆盖".

In the Displaying Overlays on a Map section of the iOS Developer Library Location Awareness Programming Guide, there is an example that "shows a filled and stroked overlay covering the state of Colorado."

// Define an overlay that covers Colorado.
CLLocationCoordinate2D  points[4];

points[0] = CLLocationCoordinate2DMake(41.000512, -109.050116);
points[1] = CLLocationCoordinate2DMake(41.002371, -102.052066);
points[2] = CLLocationCoordinate2DMake(36.993076, -102.041981);
points[3] = CLLocationCoordinate2DMake(36.99892, -109.045267);

MKPolygon* poly = [MKPolygon polygonWithCoordinates:points count:4];
poly.title = @"Colorado";

[map addOverlay:poly];

问题是否有美国所有 50 个州的坐标数据源使用相同的纬度/经度数据，并且可以随时免费获得?

Question Is there a source of coordinate data for all 50 U.S. states using this same latitude/longitude data readily and freely available?

推荐答案

在 Google 上搜索 us state outline geo coordinates 发现 stackoverflow 问题 州/省的地理边界 -> Google Maps Polygon，其答案链接到 美国各州多边形的 XML(科罗拉多州数据如下).

Ran a Google search for us state outline geo coordinates and found stackoverflow question Geographical boundaries of states/provinces -> Google Maps Polygon, which has an answer linking to XML for US state polygons (Colorado data below).

<state name="Colorado" colour="#880000">
  <point lat="37.0004" lng="-109.0448"/>
  <point lat="36.9949" lng="-102.0424"/>
  <point lat="41.0006" lng="-102.0534"/>
  <point lat="40.9996" lng="-109.0489"/>
  <point lat="37.0004" lng="-109.0448"/>
</state>

我还发现 美国州和国家边界坐标，链接到 NationalAtlas.com，一级行政边界(州)，美国，2005 年，但这些数据看起来比我需要的要精确得多.

I also found US State and Country border coordinates with a link to NationalAtlas.com, First Level Administrative Boundaries (States), United States, 2005, but that data looks much more precise than I need.

另一个数据来源是州边界数据集它链接到一个文件，其中包含构成州边界的线段的地理坐标"(下面的科罗拉多数据).

Another source of data was The State Border Data Set which linked to a file with "geographic coordinates of the line segments that make up the state borders" (Colorado data below).

bordindx, st1st2, milemark, lat, long, st1, st2,
19 ,CO-NE ,0 ,40.003 ,102.051 ,08 ,31 ,
19 ,CO-NE ,68.95 ,41.002 ,102.051 ,08 ,31 ,
19 ,CO-NE ,173.19 ,41.001 ,104.053 ,08 ,31 ,
20 ,CO-NM ,0 ,36.999 ,109.044 ,08 ,35 ,
20 ,CO-NM ,333 ,37 ,103.001 ,08 ,35 ,
21 ,CO-OK ,0 ,37 ,103.001 ,08 ,40 ,
21 ,CO-OK ,52.89 ,36.993 ,102.041 ,08 ,40 ,
22 ,CO-UT ,0 ,41 ,109.049 ,08 ,49 ,
22 ,CO-UT ,276.11 ,36.999 ,109.044 ,08 ,49 ,
23 ,CO-WY ,0 ,41.001 ,104.053 ,08 ,56 ,
23 ,CO-WY ,260.18 ,41 ,109.049 ,08 ,56 ,

更新:我将 states.xml 的精炼版本以及 Objective-C 代码放在 kjhsoftware/us-state-polygons github repo.

Update: I put an refined version of the states.xml, as well as Objective-C code on a kjhsoftware/us-state-polygons github repo.

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