Undeveloped land - Shapefile version 1. Identification Information 2. Data Quality Information 3. Spatial Data Organization Information 4. Spatial Reference Information 5. Entity and Attribute Information 6. Distribution Information 7. Metadata Reference Information 1 IDENTIFICATION INFORMATION 1.1 Citation Originator Metro Data Resource Center Publication date 1990 Title Undeveloped land 1.2 Description Abstract The undeveloped land layer represents lands appearing unimproved on aerial photography, without regard to developability and accessibility. On partially developed parcels, only undeveloped areas 1/2 acre or larger are included. Metro's Vacant Land Definitions 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 show building activity, but development is incomplete and they are considered vacant. 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. The vacant portion is added to the vacant land database. 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. Purpose The inventory reflects the status of undeveloped lands on the date the photos were flown. No conclusions regarding capability or availability for development should be made. records are updated in the fall of each year and can become outdated, especially in developing suburban areas. Supplemental information A series of 1" = 400' check plots are created covering the urban growth boundary (UGB) and urban reserve areas containing: * the previous year's undeveloped land coverage * current tax lots * geocoded building permits issued within 18 months before the date of the flight. A plot of the photo is also created. Using a light table, the two plots are compared to identify areas of change or error in the previous year's undeveloped land coverage. The checkplot is marked-up to indicate needed changes. The updates to the undeveloped land coverages are made on screen, using the hardcopy map mark-up as the reference source, and digital photography as the backcover. The Half Acre Rule: If a taxlot has a undeveloped portion that is 1/2 acre or larger, the lot is defined as partially undeveloped and partially occupied. A polygon is delineated around the occupied portion, which includes buildings, landscaped yards, etc. The remaining portion (greater than 1/2 acre) is coded undeveloped (vac = 1). The ARC/INFO coverages are tiled by county. 1.3 Time period of content 20000715 Date of photography. Vector data completed 20010115. 1.4 Status Progress Complete Maintenance/update frequency Annually 1.5 Spatial domain Description Urban Clackamas County, Multnomah County, and Washington County, Oregon West bounding coordinate -123.15156069 East bounding coordinate -122.31651100 North bounding coordinate 45.70263875 South bounding coordinate 45.23396470 1.6 Keywords Theme keyword thesaurus None Theme keyword Vacant land, undeveloped land, development, unoccupied land Place keyword thesaurus None Place keyword Portland, Multnomah County, Washington County, Clackamas County, Oregon 1.7 Access Constraints None 1.8 Use Constraints These data are sold under the agreement that the user may use the data in its business activity and for no other purpose whatsoever. User shall not allow access to the data by any other person or organization, unless authorized in writing by the Metro DRC or, if the other party is a contractor providing services to a government requiring usage of the data in order to provide contractual services. User shall not duplicate the data except for the following: (1) User may make one backup copy of the data, and (2) User may translate the data into other formats and/or media. For full product purchase agreement that accompanies these data, please see http://storefront.metro-region.org/drc/rlislite/subscribe/license.cfm 1.10 Browse graphic Browse graphic file name vacant.gif Browse graphic file description Vacant land shaded in gold with street network. Browse graphic file type GIF 1.13 Native data set environment Shape file: vacant.shp SDE layer: develop.vacant Cover name: $countyname/county/vac Software/hardware: ArcInfo 8.1 on NT workstation. ArcSDE 8.1 on Compaq Alpha 4100. Tru64 5.0 OS. [Top of Page] 2 DATA QUALITY INFORMATION 2.4 Horizontal positional accuracy Registered to tax lots. 2.5 Lineage Process step Process description Undeveloped land was first digitized. A plot was created using using the assessor's building value and land use codes. Aerial photography was then used to mark up the plot to show undeveloped land according to the photo. Process date 1990 Process step Process description The park information was dropped from this layer. Originally, park data was included in the undeveloped land layer to assure that parks were never shown as undeveloped land. This quality-control check is now accomplished by comparing the undeveloped land layer to the parks layer. Process date 1997 approx. Process step Process description Horizontal positional accuracy in city of Portland was corrected as part of re-mapping project. Process date 199710 Process step Process description The value for undeveloped land in the "vac" data field previously "0" was changed to "8". Process date 200001 Process step Process description Projection information (.prj file), compatible with ArcGIS 8.1, was added to the layer. Process date 20010715 [Top of Page] 3 SPATIAL DATA ORGANIZATION INFORMATION 3.2 Direct spatial reference method Vector 3.3 Point and vector object information SDTS point and vector object type Polygon Point and vector object count 3.4 Raster object information Raster object type NA Row count Column count 4 SPATIAL REFERENCE INFORMATION 4.1 Horizontal Coordinate System Grid coordinate system name State plane coordinate system 1983. SPCS zone identifier 5076 Planar distance units International feet Horizontal datum name North American Datum of 1983/1991 (HPGN) [Top of Page] 5 ENTITY AND ATTRIBUTE INFORMATION 5.2 Overview description Related data files and field descriptions follow: Table Name Column Sample Domain Value Definition Vacant.dbf -- -- Description of the undeveloped polygon attributes Area -- Area in square feet. Vac -- Code identifying whether the polygon is undeveloped or developed. All polygons are equal to 1. 1 Undeveloped [Top of Page] 6 DISTRIBUTION INFORMATION 6.1 Distributor Contact organization Metro Data Resource Center Address 600 NE Grand Ave. City Portland State or province OR Postal code 97232 Contact voice telephone 503 797-1742 Contact facsimile telephone 503 797-1909 Contact electronic mail address drc@metro.dst.or.us 6.3 Distribution liability The information in this file was derived from digital databases on Metro's GIS. Care was taken in the creation of this file. Metro cannot accept any responsibility for errors, omissions, or positional accuracy. There are no warranties, expressed or implied. 6.4 Standard order process Digital transfer information Format name Shapefile, arc export, DXF or MapInfo. Hourly fee will be charged for conversion Transfer size Digital transfer options: Online option Network resource name ftp.metro-region.org Access instructions Metro can place data on its FTP site on request. In most cases, a fee for the data will be charged. Call 503 797-1742 or email drc@metro.dst.or.us for instructions. Offline option Offline media CD-ROM Recording format ISO9660 (DOS, Unix, or Macintosh) Offline option Offline media Zip cartridge Recording format Iomega Fees See RLIS a la carte at http://storefront.metro-region.org/drc/alacarte/index.cfm [Top of Page] 7 METADATA REFERENCE INFORMATION 7.1 Metadata date 20010115 7.4 Metadata contact Contact person JO Price Contact voice telephone 503 797-1895 Contact facsimile telephone 503 797-1909 Contact electronic mail address pricej@metro.dst.or.us 7.5 Metadata standard name FGDC Content Standards for Digital Geospatial Metadata 7.6 Metadata standard version 19940608

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