Thank you Ian I am looking under layer properties of my DEM 10i layer and it says that its source is from USGS NED 10m DEM10 and that it was then converted to feet so I guess that it would be in feet. The following paragraph in quotes talks about resolution. The area in question is in Washington state I would guess that the resolution is either 1 arc/second or 1/3 arc-second. " NED data are available nationally at resolutions of 1 arc-second (approx. 30 meters) and 1/3 arc-second (approx. 10 meters), and in limited areas at 1/9 arc-second (approx. 3 meters). At present, the bulk of Alaska is only available at a 2 arc-second (approx. 60 meters) resolution, owing to a paucity of higher resolution source data, though some areas are available at resolutions of 1 and 1/3 arc-second with plans for significant upgrades of the state over the next five years. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data."
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