20210304 07364900 1.0 TRUE Slopes 20% or greater (LiDAR) Polygons representing slopes greater than or equal to 20% in the Portland urban services boundary area. Derived from 2014 3' resolution LiDAR bare-earth digital elevation model (DEM). All slopes average over a horizontal distance of 15'. Minimum area of contiguous slope is approximately 1/2 acre. Polygons were created, generalized and smoothed in ArcGIS 10.3.1. -- Additional Information: Category: Land Purpose: For identifying steeply-slope areas within Portland. Update Frequency: As Needed -- Metadata Link: https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52978 Bureau of Planning and Sustainability