Electronic Data Collection and Analysis System
Yin Foo, Des; Foley, Margaret
E-Publications; PublicationNT; E-Books; Report ; 39/1992
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Power and Water Authority
Report ; 39/1992
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Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 154 of 192. case, the basic procedure will remain the same, with some additional processing required to find the parameters of a best curve fit (to a True Depth . v . Logged Depth plot) through the data obtained as described above and these parameters used for the recalibration. (i) Finding the recalibration parameters: The ~ecalibration parameters are offset (0) which can be used to convert the the manually acquired data (M) (which is "true" data), by the relationship the slope (s) and logged data (L) to taken to be the M = s*L + 0 sand 0 are the slope and offset of the "best straight line through the data obtained on a plot of the Manually recorded data against the Logged data. Once sand 0 are known they can be used to calculate corracted calibration parameters to be entered in the logger or as factors to be applied to data subsequently collected by the system as in C2.4. Method 1 - using 'DATMAN' : See also an example in Appendix D (i) Use 'LOGIN' to create a file of the manually recorded depths and read the logged and manual data into the programme. (ii) Examine the data at a large enough scale to see any anomalies (e.g. caused by an incorrectly recorded time). If there is doubt about any data point (Le. if it is significantly different to the general pattt=rn) the manual reading for that time should be discarded so that point is not included in the calculation of sand o. Alternatively a third data set 'nay be created as the difference of the two data