1. A method for logging a subterranean borehole, the method comprising: (a) acquiring a pixilated trace of sensor data, the pixilated trace including a plurality of borehole parameter values at a corresponding plurality of discrete tool face angles; (b) applying a non-orthogonal, KLT-like transform to the pixilated trace to obtain transform coefficients, the transform being selected such that the transform times its transpose equals a diagonal scaling matrix; (c) quantizing the transform coefficients to obtain quantized coefficients; and (d) transmitting the quantized coefficients uphole.