Description: Area of inundation in the 1996 flood, as mapped by the US Army Corps of Engineers.
--Additional Information:
Category: Hazard
Purpose: Mapping and analysis of areas flooded in 1996.
Update Frequency: None Planned
-- Metdata Link:
https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52894
Name: Basic Earthquake Emergency Communication Node (BEECN) Locations
Display Field: SITE_NAME
Type: Feature Layer
Geometry Type: esriGeometryPoint
Description: Basic Earthquake Emergency Communication Nodes Sites - 48 sites that may be set up and staffed following a major earthquake where citizens can respond, report damage, and receive safety information.
--Additional Information:
Category: Hazard
Purpose: Mapping, planning, and analysis related to response capabilities and public safety in the event of an earthquake or large-scale incident.
Update Frequency: As Needed
-- Metdata Link:
https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=53863
Copyright Text: Portland Bureau of Emergency Management
Description: The FEMA Flood Hazard Layer represents the location and attributes of flood insurance risk zones from the Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis.
The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk.
The floodway, 100-year floodplain/SFHA (Special Flood Hazard Area), and the 500-year floodplain are all derived from this dataset.
--Additional Information:
Category: Hazard
Purpose: The FIRM is the basis for floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP). Insurance applications include enforcement of the mandatory purchase requirement of the Flood Disaster Protection Act, which "... requires the purchase of flood insurance by property owners who are being assisted by Federal programs or by Federally supervised, regulated or insured agencies or institutions in the acquisition or improvement of land facilities located or to be located in identified areas having special flood hazards, " Section 2 (b) (4) of the Flood Disaster Protection Act of 1973. In addition to the identification of Special Flood Hazard Areas (SFHAs), the risk zones shown on the FIRMs are the basis for the establishment of premium rates for flood coverage offered through the NFIP. The FIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. The FIRM Database serves to archive the information collected during the Flood Risk Project.
Update Frequency: As needed
-- Metadata Link:
https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=54347
Copyright Text: Bureau of Planning and Sustainability
Description: Police districts are an organizational unit for law enforcement agencies and have a many-to-one relationship with precincts. This dataset shows police districts only within the City of Portland.
-- Additional Information:
Category: Public Safety -Police
Purpose: For crime analysis and police analysis.
Update Frequency: As Needed
-- Metadata Link:
https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52476
Description: Police precincts for regional law enforcement agencies. This dataset is a derivitive of police_grid_pdx.
-- Additional Information:
Category: Public Safety -Police
Purpose: For mapping and analysis of law enforcement activities, crime, and expenditures in the Portland Metro area. Also used in the RegJIN system.
Update Frequency: As needed
-- Metadata Link:
https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52188
Description: 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
Copyright Text: Bureau of Planning and Sustainability
Description: 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.
-- Additional Information:
Category: Land
Purpose: For identifying steeply-slope areas within Portland.
Update Frequency: None Planned
-- Metadata Link:
https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=52978
Copyright Text: Portland Bureau of Planning and Sustainability
Name: Willamette/Columbia River Ordinary High Water
Display Field: Id
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Willamette and Columbia River ordinary high water (OHW) for the City of Portland area, as surveyed by the U.S. Army Corps of Engineers in 2004. Derived from 2010 bathymetric data and 2014 regional LiDAR elevation data.
-- Additional Information:
Category: Hydro
Purpose: For mapping and analyzing normal river levels per Army Corps surveys.
Update Frequency: None Planned
-- Metadata Link:
https://www.portlandmaps.com/metadata/index.cfm?&action=DisplayLayer&LayerID=53396
Copyright Text: Portland Bureau of Planning and Sustainability