ecef_to_lla requires two values, so even if one is willing to take the reduced geospatial resolution of float32, that's still 64-bits of parameter space. if yo

ecef_to_lla requires two values, so even if one is willing to take the reduced geospatial resolution of float32, that's still 64-bits of parameter space. if you do need 1 mm accuracy, including in the Pacific Ocean around 180 E/W then neither float32 nor scaled 32-bit ints are enough.