kscheidecker
73f0dc8361
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28 lines
923 B
Python
28 lines
923 B
Python
"""Various helper functions"""
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import math as m
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def create_bbox(coords: tuple[float, float], radius: int):
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"""
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Create a bounding box around the given coordinates.
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Args:
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coords (tuple[float, float]): The latitude and longitude of the center of the bounding box.
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radius (int): The half-side length of the bounding box in meters.
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Returns:
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tuple[float, float, float, float]: The minimum latitude, minimum longitude, maximum latitude, and maximum longitude
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defining the bounding box.
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"""
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# Earth's radius in meters
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R = 6378137
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lat, lon = coords
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d_lat = radius / R
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d_lon = radius / (R * m.cos(m.pi * lat / 180))
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lat_min = lat - d_lat * 180 / m.pi
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lat_max = lat + d_lat * 180 / m.pi
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lon_min = lon - d_lon * 180 / m.pi
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lon_max = lon + d_lon * 180 / m.pi
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return (lat_min, lon_min, lat_max, lon_max)
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