查找最小/最大纬度和经度 [英] Find Minimum/Maximum latitude and Longitude

问题描述

我的问题是如何从当前位置找到特定区域 (500米) 的最小和最大纬度和经度.

My Question is how can i find minimum and maximum latitude and longitude of specific area (500 meter) from current location.

就我而言，例如，我需要获取 X 和 Y CLLocation (纬度和经度)从 500 面积米
看到我的图片(很抱歉，这张照片可能不好用)

In my case, Such like i need to get X and Y CLLocation (latitude and longitude) from 500meter of area
See my image (sorry for this may be bad drawing )

我还必须尝试使用​​Google谷歌搜索功能，并且获得类似

I also have to tried to googling and i got link such like

我如何才能使用当前位置和半径获取最小和最大纬度和经度?

但是我不知道它如何实现.

But i don't know how it implement in my case.

请帮助我解决这个问题.

Pleas help me in this issue.

注意:我不想使用 CLLocationDistance distance = [currentLocation distanceFromLocation:newLocation]; ，因为它对我的情况没有帮助.

NOTE : I do not want to use CLLocationDistance distance = [currentLocation distanceFromLocation:newLocation]; because it is not helpful in my case so..

推荐答案

如果您不需要真正精确的值，请使用

If you don't need a really precise value, then use the approximation that 1 degree is 111 km. Based on this, you need to add and remove 0.0025 degrees to the current coordinates to get corners of the area you are looking for.

rectanglesidelengthmeters = 500
degreedeltalat = 0.001 * (rectanglesidelengthmeters / 2.0) * cos(current.lon)
degreedeltalon = 0.001 * (rectanglesidelengthmeters / 2.0) * cos(current.lat)
minlat = current.lat - degreedeltalat
maxlat = current.lat + degreedeltalat
minlon = current.lon - degreedeltalon
maxlon = current.lon + degreedeltalon

您可能需要稍微校正一下结果，以使纬度值保持在-90 .. 90范围内，经度值保持在-180 .. 180范围内，但我认为CLClocation也会为您处理.

You may need to correct the result a little for staying in the -90 .. 90 range for latitude and -180 .. 180 range for longitude values but I think CLClocation will handle that for you too.

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