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Started by Jonathan S. Clough, March 29, 2010, 05:52:41 PM
QuoteFrom: rloiselle on: March 26, 2010, 02:49:06 PMExamining our elevation data for conversion errors in the data processing of date and datum conversions, stated on pg 9 of the manual, has lead us to question whether we should be adding or subtracting the difference between MTL and NAVD88 from the DEM elevations. In our mind, because we want to set the NAVD88 elevations to an MTL datum, and our NAVD88 elevations are located below our MTL, we feel like we should be adding that difference to bring our elevations up to the MTL level. My understanding is that the East Coast MTL is lower than their NAVD88 and so subtracting that difference would bring their elevations down to MTL?