Top of Bank
Category	Hydro
Feature Dataset Name	STAND-ALONE
Item Name	TOP_OF_BANK_PDX
Database Type	SDE
Originator	City of Portland
Bureau	Bureau of Planning and Sustainability
Publication Date	05/18/2010
Abstract	Lines representing top-of-bank of major rivers and streams in the Portland region (where mapped). River top of bank derived from 2014 LiDAR using an automated mapping method explained in the process steps below. River top of bank will be completely mapped by early 2017. Columbia Slough top of bank derived from visual interpretation of aerial photos and 2007 LiDAR data. Mapping will be expanded over time using LiDAR data and field surveys.
Purpose	For locating top-of-bank in the Portland region
Supplemental Information	Refer to the City of Portland Zoning Code definitions for a definition of top of bank, and how it is measured.
Last Dataset Update	05/04/2020 13:43
Last Source Update	05/04/2020 07:13
Maintenance/Update Frequency	As needed
Extent	City of Portland
Data Type	Vector
Shape Type	Poly Line
Feature Count	239
Horizontal Position Accuracy	Mapped using LiDAR digital elevation model (DEM) and, where manually identified, aerial photos as reference. Refer to the LiDAR data and aerial photo metadata for specific information about horizontal accuracy.
Horizontal Position Accuracy Link	Neither
Progress	Complete
North Bounding Coordinate	729081.39895013
South Bounding Coordinate	676519.185039371
East Bounding Coordinate	7696976.957021
West Bounding Coordinate	7617373.25853018
Theme Keyword(s)	top-of-bank, streams, rivers
Theme Keyword Thesaurus	None
Place Keyword(s)	Portland, Multnomah County, Washington County, Clackamas County, Oregon
Place Keyword Thesaurus	None
Access Constraints	Available for Public Use
Use Constraints	These data are distributed under the terms of the City of Portland Data Distribution Policy. Care was taken in the creation of this data but it is provided "as is". The City of Portland cannot accept any responsibility for errors, omissions, or positional accuracy.
Source Dataset Type	File Geodatabase
Output Geodatabase	EGH_Public
Distribution	Grid: State plane coordinate system 1983(91). Units: International feet Datum: North American Datum of 1983/1991 (HPGN) Liability: The information in this file was derived from digital databases on the City of Portland GIS. Care was taken in the creation of this file. The City cannot accept any responsibility for errors, omissions, or positional accuracy. There are no warranties, expressed or implied. Format: Shapefile or File Geodatabase Feature Class - Data will be provided via City of Portland FTP Site. Online Resource: http://portlandmaps.com/opendata Online Instructions: City of Portland Public/Open Data is distributed via the PortlandMaps Open Data Site - http://portlandmaps.com/opendata. Data not available on the PortlandMaps Open Data site can be requested by contacting the City of Portland CGIS Group - maps@portlandoregon.gov Transfer Size: varies SPCS Zone Identifier: 5076
Contact(s) Add
Neil Loehlein 503-823-7061 503-823-7800 Neil.Loehlein@portlandoregon.gov 1900 SW 4th Avenue, Suite #7100 Portland, OR 97201 City of Portland - BPS 503-823-7700 503-823-7800 BPS@portlandoregon.gov
File(s) Add Add File File Description Cancel Add File
Images	53223.png 311.76Kb X
Lineage Add
01/01/2010	Manual mapping of top of bank (Columbia Slough) Top of bank in parts of the Columbia Slough was manually mapped by the Bureau of Environmental Services in 2010 using the 2005 LiDAR DEM, the 2005 LiDAR hillshade, and 2010 6" aerials as reference. This mapping will eventually be updated with results from the automated mapping method.
02/01/2016	Automated mapping of top of bank Top of bank was mapped using the 2014 LiDAR digital elevation model (DEM), the LiDAR-derived ordinary high water line, and a geoprocessing script that automatically identifies top of bank based on the Zoning Code definition of top of bank. The script also removes "Noise" in the raw mapping output by applying several generalization tools to the raw output. The mapping script is available upon request.

Web Services

Service	Description	Feature Access	Layer
CGIS_Layers		Dynamic	Top of bank (where mapped)

Attribute Tables & Domains

X top_of_bank_pdx
Table Description
Table Jurisdiction
Column Sort	Column Name	Column Alias	Column Type	Column Size	Domain Value(s)	Column Description Add
1	OBJECTID	OBJECTID	Integer	4	Add	X A unique software ID for each polygon. May change when data is modified.
1	SOURCE	Reference Source	String	60	Add Field Survey Mapped based on GPS information or other data collected in a field survey X LIDAR DEM Visually mapped based on information derived from 2005 LiDAR data X LIDAR-Derived Mapped using an automated method based on the Zoning Code definition of top of bank. Refer to the lineage section above for a description of the processing steps. X	X The reference source for the mapped top-of-bank
1	SOURCE_REF	Reference Source Details	String	30	Add 2014 LiDAR data Source is the 2014 3' resolution LiDAR digital elevation model (DEM) X 2005 LiDAR Data Source is 2005 3' resolution LiDAR digital elevation model (DEM) and hillshades X	X Any additional reference information regarding the mapping source (LiDAR flight date, survey information, etc.)
1	MODIFIER	Modified By	String	15	Add BES City of Portland Bureau of Environmental Services X BPS City of Portland Bureau of Planning & Sustainability X Metro Metro X	X Last organization to edit the top-of-bank lines
1	MOD_NAME	Modifier Name	String	15	Add	X Initials of the last person to edit the top-of-bank line
1	MOD_DATE	Modification Date	Date	8	Add	X Date of the last modification
1	CREATED_BY	Created By	String	50	Add	X Name of the organization that originally created the top-of-bank line. Same domain as the "MODIFIER" attribute
1	CREATEDATE	Creation Date	Date	8	Add	X Date the top-of-bank line was originally created.
1	FIELD_DATE	Field Date	Date	8	Add	X Date of any field visit or survey.
1	REVIEW	Flag for Review?	String	5	Add	X Indicates whether the top-of-bank line needs further review (i.e., the mapped location is approximate).
1	NOTES	NOTES	String	150	Add	X Any notes related to the top-of-bank line
1	IS_TOB	Is TOB?	String	5	Add	X "True" indicates the line represents a top-of-bank; all other lines are used to create polygon features for modeling purposes.