<p>这个代码不太好用,它在公里和米之间跳跃</p>
<p>修复了代码,使名称更具PEP8风格,并添加了一个简单的box对象:</p>
<pre><code>class BoundingBox(object):
def __init__(self, *args, **kwargs):
self.lat_min = None
self.lon_min = None
self.lat_max = None
self.lon_max = None
def get_bounding_box(latitude_in_degrees, longitude_in_degrees, half_side_in_miles):
assert half_side_in_miles > 0
assert latitude_in_degrees >= -90.0 and latitude_in_degrees <= 90.0
assert longitude_in_degrees >= -180.0 and longitude_in_degrees <= 180.0
half_side_in_km = half_side_in_miles * 1.609344
lat = math.radians(latitude_in_degrees)
lon = math.radians(longitude_in_degrees)
radius = 6371
# Radius of the parallel at given latitude
parallel_radius = radius*math.cos(lat)
lat_min = lat - half_side_in_km/radius
lat_max = lat + half_side_in_km/radius
lon_min = lon - half_side_in_km/parallel_radius
lon_max = lon + half_side_in_km/parallel_radius
rad2deg = math.degrees
box = BoundingBox()
box.lat_min = rad2deg(lat_min)
box.lon_min = rad2deg(lon_min)
box.lat_max = rad2deg(lat_max)
box.lon_max = rad2deg(lon_max)
return (box)
</code></pre>