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The IceCube Neutrino Observatory deployed 5160 digital optical modules (DOMs)on 86 cables, called strings, in a cubic kilometer of deep glacial ice belowthe geographic South Pole. These record the Cherenkov light of passing chargedparticles. Knowledge of the DOM positions is vital for event reconstruction.While vertical positions have been calibrated, previous in-situ geometrycalibration methods have been unable to measure horizontal deviations from thesurface positions, largely due to degeneracies with ice model uncertainties.Thus the lateral position of the surface position of each hole is to date inalmost all cases used as the lateral position of all DOMs on a given string.With the recent advances in ice modeling, two new in-situ measurements have nowbeen undertaken. Using a large sample of muon tracks, the individual positionsof all DOMs on a small number of strings around the center of the detector havebeen fitted.  Verifying the results against LED calibration data shows that thestring-average corrections improve detector modeling. Directly fittingstring-average geometry corrections for the full array using LED data agreeswith the average corrections as derived from muons where available. Analysesare now ongoing to obtain per-DOM positions using both methods and in addition,methods are being developed to correct the recorded arrival times for theexpected scattering delay, allowing for multilateration of the positions usingnanosecond-precision propagation delays.

Refining the IceCube detector geometry using muon and LED calibration data