Metadata: Vacant Land

Vacant Land

Category Development
Feature Dataset Name Stand-Alone
Item Name vacant_land_pdx
Database Type SDE
Originator City of Portland
Bureau Bureau of Planning and Sustainability
Publication Date 08/01/2011
Abstract The vacant land layer represents lands appearing unimproved on aerial photography, without regard to accessibility. Originally created by Metro, but now maintained by the City of Portland, Bureau of Planning & Sustainability.
Purpose Developed and maintained over the last ten years, the vacant land dataset represents the foundation for measuring buildable lands within the region. The data is derived from examination of aerial imagery and other information such as Lidar-derived building footprints. Editing is performed at a taxlot level and every attempt is made to rectify and register the data to the regional taxlot file. Data is used in measuring buildable lands and analyzing development capacity within Portland.
Supplemental Information The inventory reflects the status of vacant land on the date the most recent aerial photos were flown. No conclusions regarding capability or availability for development should be made.
Last Dataset Update 08/02/2011 20:10
Last Source Update 08/02/2011 20:10
Maintenance/Update Frequency As needed
Extent Clackamas County, Multnomah County, and Washington County, Oregon
Data Type Vector
Shape Type Polygon
Feature Count 4859
Horizontal Position Accuracy Registered to taxlots.
Horizontal Position Accuracy Link Taxlots
Progress Complete
North Bounding Coordinate 728024.561351702
South Bounding Coordinate 651294.695866153
East Bounding Coordinate 7700961.04199475
West Bounding Coordinate 7597379.28018373
Theme Keyword(s) vacant, parcels, capcity, buildable
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 Shapefile
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)
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File(s)
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Images
53344.png 272.00Kb X
Lineage
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Original Metro data processing: > Every tax lot is determined to be vacant, partially vacant, or developed. Vacant tax lots are those that have no building, improvements or identifiable land use. > Developed lots must have improvements and specific land uses. For example, a paved parking lot is developed but an unpaved lot where trucks are parked is vacant. > Lots under site development are only considered developed if structure activity is evident. For example, earthwork and grading are considered vacant but buildings under construction (foundation or more) are considered developed. > If a developed tax lot has 1/2 acre (20,000-sq. ft.) or greater portion that is vacant, the lot is considered to be partially vacant and partially developed. A polygon is delineated around the occupied portion, which includes buildings, landscaped yards, etc. The remaining portion (greater than 1/2 acre) is coded vacant (vac = 1). > Parks and open spaces are treated as developed. > During the assessment of each tax lot, no consideration is given to constrained land, suitability for building, or to redevelopment potential.
City of Portland processing: > vacant parcels are added to the original Metro inventory as needed based on review of Assessor data, LiDAR-derived building footprints, aerial photos, and other sources. > partial lots are not limited to 1/2 acre. Partially vacant lots down to 5,000 square feet can be included in the dataset.
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Attribute Tables & Domains

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vacant_land_pdx
Table Description
Table Jurisdiction
Column Sort Column Name Column Alias Column Type Column Size Domain Value(s) Column Description
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1 OBJECTID OBJECTID Integer 4
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Unique ID for each polygon feature
1 Source Source String 60
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The source of the vacant parcel (i.e., Aerial Photos, demolition building permit, etc.)
1 Source_Ref Source_Ref String 60
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The specific source information (i.e., the aerial photo year or the building permit case number).
1 Modifier Modifier String 30
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Organization that last modified the data
1 Mod_Name Mod_Name String 15
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Name of the editor in the organization that last modified the data
1 Mod_Date Mod_Date Date 36
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Date of the last modification
1 Created_By Created_By String 30
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Organization that originally created the vacant parcel or partial-parcel polygon
1 CreateDate CreateDate Date 36
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The data the polygon was originally created
1 Review Review String 5
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"True" indicates the vacant polygon needs to be further reviewed for accuracy.
1 Notes Notes String 150
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Any notes related to the parcel