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How is velocity calculated in Quikslope and Autoslope?

calculated quikslope velocity
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How is velocity calculated in Quikslope and Autoslope?

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Velocity is the difference between adjusted distances of the current reading with the previous reading, expressed in mm per day. So if we have 2 readings: 1. 12-OCT-03 3:00AM adj dist=856.234 2. 12-OCT-03 1:00PM adj dist=856.236 3. 13-OCT-03 9:00AM adj dist=856.235 4. 13-OCT-03 9:00PM adj dist=856.232 The current reading is #4. Now the calculation in Quikslope (as at 25-May-04) will get the difference between #4 and #3 as 3mm over 12hours which equates to a velocity of 6mm per day. This method can be misleading because the instrumentation tolerance is +/- 3mm plus, if a weather station is not used, then atmospherics can increase that even more, although the REF prism adjustment should compensate. So, for very short time frames, say like 1 hour between readings, and if there is a difference of 2mm in distances, this will equate to 28mm per day velocity when indeed there may be a zero velocity. So to try to make the velocity calculation more practical, we do it a little different in Auto

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