Metro Data Resource CenterAreas of land with slopes equal to or greater than 25 percent (approximately 12 degrees), derived from the 2019 Metro Lidar Project bare earth digital elevation model (DEM). The lidar data were acquired by NV5 and processed by GeoTerra, Inc. under contract to Metro. GeoTerra created a 3-foot bare earth DEM meeting USGS Quality Level 1 (QL1) standards with a vertical accuracy of less than or equal to 10 cm RMSE(z). The slope polygons were created by Metro using ArcGIS Pro Spatial Analyst tools and custom ArcPy workflows. The same 2019 DEM used to generate the Contours (two foot interval) and Slope (10 Percent) datasets served as the elevation source, ensuring consistency across all elevation-based layers. Date of last data update: 2019-08-31 This is official RLIS data. Contact Person: Franz Arend franz.arend@oregonmetro.gov 503-797-1742 RLIS Metadata Viewer: https://gis.oregonmetro.gov/rlis-metadata/#/details/3859 RLIS Terms of Use: https://rlisdiscovery.oregonmetro.gov/pages/terms-of-useArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/e5c4427afd4249769661c69ae850c527_0engRLIS DiscoveryPublicSlope (25 percent) [Oregon--Portland]Web servicesOregon--PortlandOregonLast Modified: 2025-11-06