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    Image Title  Abstract Category Last Updated
    100 Foot Elevation Polygons (LiDAR-based) Elevation polygons created from a three foot LiDAR DEM produced in 2008. The DEM is searchable under the Item Name DEM_LIDAR_PDX. Land 10/07/14 11:42 AM
    Elevation Contours (City) Contour dataset represents the earth's surface with all vegetation and man-made structures removed representing just the physical ground surface. Features represent approximated elevations. Land 12/07/16 04:09 PM
    Islands This data set is comprised of polygons representing islands located in the riverway. Land 04/03/03 09:55 AM
    Slopes 10% or greater Polygons representing slopes greater than or equal to 10% 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. Land 12/15/15 04:39 PM
    Slopes 20% or greater 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. Land 04/16/19 02:54 PM
    Slopes 25% or greater (LiDAR) Polygons representing slopes greater than or equal to 25% 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. Land 02/28/19 03:39 PM

       
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