给定纬度，经度和距离，我想找到一个边界框 [英] Given a latitude and longitude, and distance, I want to find a bounding box

问题描述

考虑到纬度，经度和距离，我想找到一个距离小于给定距离的边界框.

Given a latitude and longitude, and distance, I want to find a bounding box where the distances are less than the given distance.

在此处提出了以下问题:如何计算给定纬度/经度位置的边界框?

This questions was asked here: How to calculate the bounding box for a given lat/lng location?

我不希望它在表面上是准确的，所以我将其修改并简化为

I donot want this partcularly accurate, so I have modified and simplified it to

def boundingBox(latitudeInDegrees, longitudeInDegrees, halfSideInKm):
    lat = math.radians(latitudeInDegrees)
    lon = math.radians(longitudeInDegrees)
    halfSide = 1000*halfSideInKm

    RADIUS_OF_EARTH  = 6371
    # Radius of the parallel at given latitude
    pradius = radius*math.cos(lat)

    latMin = lat - halfSide/radius
    latMax = lat + halfSide/radius
    lonMin = lon - halfSide/pradius
    lonMax = lon + halfSide/pradius
    rad2deg = math.degrees
    return (rad2deg(latMin), rad2deg(lonMin), rad2deg(latMax), rad2deg(lonMax))

但是我无法理解它是如何工作的，特别是这条线对我来说没有任何意义halfSide = 1000*halfSideInKm

But I cant understand how this is working, in particular this line makes no sense to me halfSide = 1000*halfSideInKm

推荐答案

该行将边界框单位从公里转换为米.

That line is converting the bounding box units from kilometres to metres.

这篇关于给定纬度，经度和距离，我想找到一个边界框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！