Hello, perhaps a silly question.... but if the USGS NED DEM I am working with is 1/3 arc second resolution, what are the units? I need them to be meters and not sure if I need to do any conversion.
thanks so much!
Yep, the vertical units are metres above the datum.
Measuring in Arc-Seconds (esri.com)
It really depends on your latitude. I'd suggest projecting the data into a planimetric system with horizontal units of feet or metres (probably use a projection with the same datum (NAD83 I think?) like a UTM NAD83 system) depending on your study area.
Yes, my projected coordinate system is NAD 1983 UTM Zone 12. I just found this: https://www.usgs.gov/faqs/what-are-projection-horizontal-and-vertical-datum-and-resolution-3d-elevation-program-3dep?qt-news_science_products=0#qt-news_science_products
So I guess this means the elevation units are in meters? Which is really what I care for.
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