|Collection System Analysis
|Feature Dataset Name
|City of Portland
|Bureau of Environmental Services
|A layer that displays impervious surfaces
|Delineation of parking surfaces, road surfaces, and building footprints which are useful for analysis and display of impervious area.
|The impervious dataset was derived from aerial photo geometric photography flown over the years 1996 thru 2023. Updates occur periodically using heads up digitizing techniques from aerial photos covering the City of Portland Watersheds. Using the 2019 Lidar flight data, new buildings were detected and flagged for input into the layer. Structures that no longer exist are removed by reviewing the aerial imagery yearly at a 1000-footscale in ArcGIS. The layer includes the delineation of parking surfaces, road surfaces and building footprints. All areas are delineated as closed polygons.
|Last Dataset Update
|Last Source Update
|Clackamas County, Multnomah County, and Washington County, Oregon
|Horizontal Position Accuracy
|Horizontal Position Accuracy Link
|North Bounding Coordinate
|South Bounding Coordinate
|East Bounding Coordinate
|West Bounding Coordinate
|Theme Keyword Thesaurus
|Portland, Multnomah County, Washington County, Clackamas County, Oregon
|Place Keyword Thesaurus
|CGIS Do not distribute without Bureau Approval
| After permission is granted by responsible bureau, 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
| Grid: State plane coordinate system 1983(91).
Units: International feet
Datum: North American Datum of 1983/1991 (HPGN)
Liability: The City of Portland has placed restrictions on the distribution of this data due to security concerns. Access requests will be considered on a case-by-case basis. 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 - email@example.com
Transfer Size: varies
SPCS Zone Identifier: 5076