Hello Mr. Gilbreath, The full metadata description for “Contours_2ft" is available here: https://www1.maine.gov/megis/catalog/metadata/contours_2ft.htm From the metadata in WKT the datum and projection information is: PROJCS["NAD_1983_UTM_Zone_19N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-69.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26919]] Thank you for the inquiry. Todd Metzler State of Maine Office of Information Technology GIS From: Maine GeoNews [mailto:[log in to unmask]] On Behalf Of Aaron Gilbreath Sent: 2017-09-29 15:55 To: [log in to unmask] Subject: sea-level in 2' contour shapefiles? Hello Everyone, I was wondering if anyone could tell me how sea-level is zeroed in the 2' contour layers on the Maine GIS site? Is it from low tide, high tide, or mean tide level? Thanks in advance, and I apologize in advance if this answer is obvious. I didn't see it in the metadata. Thanks, Aaron Aaron Gilbreath 148 East Main St Yarmouth, ME 04096 (207) 841-4805 ----------------------------------------------------------------------- This list Maine GeoNews (GEOLIBRARY-L) is an unmoderated discussion list for all Maine GIS Users. If you no longer wish to receive e-mail from this list, you can remove your name and email address yourself at the this web address: http://lists.maine.edu/cgi/wa?SUBED1=geolibrary-l&A=1 Or,you may also request that your name be removed by sending email to: mailto:[log in to unmask] ----------------------------------------------------------------------- This list Maine GeoNews (GEOLIBRARY-L) is an unmoderated discussion list for all Maine GIS Users. If you no longer wish to receive e-mail from this list, you can remove your name and email address yourself at the this web address: http://lists.maine.edu/cgi/wa?SUBED1=geolibrary-l&A=1 Or,you may also request that your name be removed by sending email to: [log in to unmask]