[英]iOS: How to convert MKMapPoint or CLLocationCoordinate2D to UTM?
From what I have read this takes some complicated Math that I am not good at. 从我所看到的,这需要一些我不擅长的复杂数学。 So, I am asking here.
所以,我在这里问。
Does anyone have experience converting a MKMapPoint or CLLocationCoordinate2D to a UTM value? 有没有人有将MKMapPoint或CLLocationCoordinate2D转换为UTM值的经验? I found this resource ( http://www.uwgb.edu/dutchs/usefuldata/UTMFormulas.HTM ) but the math is overwhelming.
我找到了这个资源( http://www.uwgb.edu/dutchs/usefuldata/UTMFormulas.HTM ),但数学是压倒性的。
I recently wrote a class for this and posted a sample project on GitHub 我最近为此编写了一个类,并在GitHub上发布了一个示例项目
UTMConverter example for iOS 适用于iOS的UTMConverter示例
The part you want is a file called UTMConverter.m. 你想要的部分是一个名为UTMConverter.m的文件。 It has methods for converting from lat/long to UTM and vice-versa.
它有从lat / long转换为UTM的方法,反之亦然。
You could use one lib to do that, or analyze the code of one lib to understand the algorithm and do it yourself. 您可以使用一个lib来执行此操作,或者分析一个lib的代码以了解算法并自行完成。
This is a c++ lib that does the job: http://geographiclib.sourceforge.net/html/ 这是一个完成这项工作的c ++ lib: http : //geographiclib.sourceforge.net/html/
http://geographiclib.sourceforge.net/html/classGeographicLib_1_1UTMUPS.html http://geographiclib.sourceforge.net/html/classGeographicLib_1_1UTMUPS.html
I found this website (http://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html). 我找到了这个网站(http://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html)。 If you look at the source code, the whole conversion is done using JavaScript, you can have a look at it and try to convert to Obj-c.
如果您查看源代码,整个转换是使用JavaScript完成的,您可以查看它并尝试转换为Obj-c。
MKMapViewZoom
appears to have some class methods which can convert between flat-map (geometric) & curved-map (geographic) coordinates, though I haven't tested them out. MKMapViewZoom
似乎有一些类方法可以在平面地图(几何)和曲线图(地理)坐标之间进行转换,但我还没有测试过它们。 Somebody give me a thumbs up if this actually works 如果这确实有效,有人会竖起大拇指
//convert from WGS84 (geographic coordinates) to UTM (geometric coordinates)
+ (double)longitudeToPixelSpaceX(double)pixelX
+ (double)latitudeToPixelSpaceY(double)pixelY
//convert from UTM to WGS84
+ (double)pixelSpaceXToLongitude(double)longitude
+ (double)pixelSpaceYToLatitude(double)latitude
some documentation here 这里有一些文件
UPDATE: 更新:
This is maddening, but in order to get this class's source code to work accurately I basically had to extract the methods into my own domain essentially, then remove the parts of the code referencing MERCATOR_OFFSET
& change MERCATOR_RADIUS
to the meters value of the Earth's radius. 这是发疯,但为了得到这个类的源代码,以准确地工作,我基本上不得不方法提取到自己的域名本质上,然后删除代码的部分引用
MERCATOR_OFFSET
&转换MERCATOR_RADIUS
到地球半径的米值。 I was kind of, ok, very surprised when I discovered this actually worked. 当我发现这实际上有效时,我很好,非常惊讶。
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