Created
August 15, 2025 18:01
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Lightning Flash Clustering: convert (lat, lon, alt) to (x, y, z)
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| def to_ecef(spatial_data: array_type) -> array_type: | |
| rad_lat = spatial_data[:,0] * np.pi / 180 | |
| rad_lon = spatial_data[:,1] * np.pi / 180 | |
| altitudes = spatial_data[:,2] | |
| a=6378137.0 | |
| b=6356752.314245 | |
| e2=1 - b**2/a**2 | |
| cot = 1 / np.tan(rad_lat) | |
| n_phi = a / np.sqrt(1 - (e2/ (1+ np.square(cot)))) | |
| transformed_data = np.zeros(spatial_data.shape) | |
| transformed_data[:,0] = (n_phi + altitudes) * np.cos(rad_lat) * np.cos(rad_lon) | |
| transformed_data[:,1] = (n_phi + altitudes) * np.cos(rad_lat) * np.sin(rad_lon) | |
| transformed_data[:,2] = ((1-e2)*n_phi + altitudes) * np.sin(rad_lat) | |
| return transformed_data |
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