Death Valley Project 6060 For magnetic file: Death Valley is only one of a few quadrangles that was flown at one mile line spacing. The individual lines were very noisy so the totmag was micro-leveled to lightly filter out some of the noise and remove some of the "herringbone". The resmag was recalculated from the mico-leveled totmag using a Definitive IGRF for the earth's field. The resmag in the radiometric file is the original resmag. It is not the recalulated resmag from the magnetic file.