Vejledning og kravspecifikation for SkyTEM-målinger - Aarhus ...

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Vejledning og kravspecifikation for SkyTEM-målinger - Aarhus ...

Januar 2010 Parameter SLM/ HM Comment LM vate of the dB/dt sounding curve as selected with Use 2nd Order Slope filters. Cap Slope back step 30 30 Number of additional data points backwards to be removed from the data curve. Ave Sign Filter ON ON Sets filter on/off. Sign filters cull data if a sign change is found.. Ave Sign from time [s] 1.5e-5 1e-4 Data points before this value are not evaluated by the filter. Ave Sign back step 1 1 Number of additional data points backwards to be removed from the data curve. Ave Slope Filter ON ON Sets filter on/off. Slope filters cull data if the slope or the chance in slope (2nd order slope ON) of the dB/dt sounding curve is not within specified min/max slopes interval Ave Slope from time 1.5e-5 1e-4 Data points before this value are not evaluated by the filter. Ave Slope min slope -0.6 -0.6 Defines the smallest acceptable 1st or 2 nd order derivate of the dB/dt sounding curve as selected with Use 2nd Order Slope filters. Ave Slope max slope 0.6 0.6 Defines the maximum acceptable 1st or 2 nd order derivate of the dB/dt sounding curve as selected with Use 2nd Order Slope filters. Ave Slope back step 0 0 Number of additional data points backwards to be removed from the data curve Trapez Filter ON ON Always On, Off is included for compatibility reasons for very old data. Trapez Sounding Distance [s] 2 2 Sets the distance in time between soundings. Trapez Gate Time 1 [s] 1e-5 1e-4 Sets the time of Trapez Width 1 Trapez Gate Time 2 [s] 1e-4 1e-3 Sets the time of Trapez Width 2 Trapez Gate Time 3 [s] 1e-3 1e-2 Sets the time of Trapez Width 3 Trapez Width 1 [s] 3 6 Sets the width of the filter at Trapez Gate Time 1 Trapez Width 2 [s] 6 12 Sets the width of the filter at Trapez Gate Time 2 Trapez Width 3 [s] 12 36 Sets the width of the filter at Trapez Gate Time 3 Trapez Spike Factor 25 25 Median filtering of the data. E.g. Spike Factor = 20 removed the upper and lower 10% of the data with in the averring width for each gate Trapez Min. No. Gates [%] 25 25 Minimum number of possible gates in the averaging interval that must be in use for an average sounding to be created. Trapez Min. No Gates per Sound. 7 5 If less than Trapez Min. No. Gates per Sounding are in use after the filtering of the average data the sounding is removed. Trapez Sync. location of sond. ON ON Synchronize the location/time of the sounding from the different software channels. Trapez Require left/right sound. OFF ON If set to On raw date are required to both left and right side of the sounding time within the average interval for an average data point to be created. Off makes a more densely soundings/models sampling/averring possible without getting “holes” in the sounding array. 3

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