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This spatial data set contains lines representing 1 meter Elevation Contours from the 2018 Ortho delivery. This layer is a merge of the tiled vector line delivery. The ortho-imagery from which the contours were derived was acquired through the Niagara Region 2018 Digital Ortho-Photography Project, a collaboration between municipal government, utilities, and educational institutions. The imagery was acquired in the spring of 2018, with a minimum horizontal and vertical accuracy of 50 cm, tested to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 50cm RMSEz Vertical Accuracy Class. Actual non-vegetated vertical accuracy was found to be +/- 40.41 cm, and vegetated vertical accuracy was found to be +/-61.85 cm at the 95% confidence level. The 2018 DTM is an update of the original DTM created in 2002, and subsequently updated using 2006 and 2010 imagery. 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