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Monitoring of climatic variability and climate modeling both require a reliable global cloud data set. Examination is made of the temporal and spatial variability of cloudiness in light of recommendations made by GARP in 1975 (and updated by JOC in 1978 and 1980) for cloud data archiving. An examination of the methods of comparing cloud cover frequency curves suggests that the use of the beta distribution not only facilitates objective comparisons, but also reduces overall storage requirements. A specific study of the only current global cloud climatology (the U.S. Air Force's 3-dimensional nephanalysis) over the United Kingdom indicates that discussion of methods of validating satellite-based data sets is urgently required.

A comparative survey using multi-loop axial DHEM and three component DHEM was undertaken on the Balcooma deposit, North Queensland by Crone Geophysics & Exploration Ltd. in 1991. Unlike the axial data, results from the three component data are unambiguous as to the location and orientation of a previously undetected extension of a mineralised lens.The paper shows how cross-component data can be corrected for probe rotation down the hole using the primary field and suggests that vector presentation of results can aid interpretation.