King County NWI Wetlands with LLWW, HGM and Function Attributes [Washington (State)--King County]
King County GIS Open Data · 2025 Full Details
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Full Details
- Title
- King County NWI Wetlands with LLWW, HGM and Function Attributes [Washington (State)--King County]
- Description
- For more information about this layer please see the GIS Data Catalog . The project, entitled "King County Wetland Inventory Update, King County, WA " used geospatial techniques and image interpretation processes to remotely map and classify wetlands (includes deepwater habitats) and riparian areas in King County, WA. Wetlands for the project area were mapped and classified using on-screen digitizing methods in a Geographical Information System (GIS). This process was supported by development of a selective image interpretation key that resulted from field verification of image signatures and wetland classifications. Wetland image interpretation employed a variety of input image and collateral data sources, as well as field verification techniques. All mapping was completed at an on-screen scale of 1:5,000 or larger in compliance with national wetland mapping standards. The primary source imagery for mapping consisted of Eagleview, 2021, one-quarter foot, true-color pictometry. 8-bit, tiled orthophotography in TIFF format published by King County and mosaiced by GSS. Collateral data used in the mapping process included Light Detection and Ranging (LiDAR) Digital Elevation Model (DEM) 1.5 ft resolution and LiDAR derived products such as hillshade, contours, depth grids, and synthetic flow networks; King County Digital Surface Model Vegetation Height; King County Coho intrinsic potential stream layer; Beaver Intrinsic Potential (BIP); Historic National Wetland Inventory (NWI); National Hydrography Dataset (NHD) springs and watershed boundaries; ESRI basemap imagery; and Google Earth Time Slider True Color Imagery (GE); King County wetland layers; King County Stormwater features; King County wetland mitigation sites; King County Habitat Restoration sites; and Wetland Intrinsic Potential (WIP). All feature creation and attribution were completed with on-screen digitization procedures using ESRI, ArcGIS Pro 3.2.0 with advanced editing tools. For wetland mapping and classification projects at the landscape level, a desktop computer heads-up digitizing process is performed referencing the Federal Geographic Data Committee (FGDC) Wetlands Mapping Standard (FGDC-STD-015-2009, FGDC 2009) and the FGDC Classification of Wetlands and Deepwater Habitats of the United States Standard (FGDC-STD-004-2013, FGDC 2013). Field reviews are used to address questions regarding image interpretation, land use practices, classification of wetland type and verification of preliminary mapping. The King County inventory of wetlands used source imagery and collateral data to identify and classify features within the FGDC Standards (FGDC-STD-015-2009, FGDC 2009; FGDC-STD-004-2013, FGDC 2013). The projects Target Mapping Unit was 0.25 acres; however, features mapped beyond this TMU by request of King County and at the interpreters discretion. Following this process, the King County inventory went through a standardized Quality Assurance and Quality Control (QA/QC) process with the United States Fish and Wildlife Service (USFWS) NWI program, King County, and GSS's internal QAQC review.
- Creator
- King County
- Publisher
- King County GIS Open Data
- Temporal Coverage
- Last Modified: 2025-07-23
- Date Issued
- 2025-07-23
- Rights
- Use Constraint: King County data are made available with the understanding that they shall be used exclusively by the obtainer or their authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County. Acknowledgement of the U.S. Fish and Wildlife Service and (or) the National Wetlands Inventory would be appreciated in products derived from these data.The delineation and classification of wetlands and deepwater habitat features through image and collateral data relies on the subjective interpretation of wetland boundaries and wetland classification characteristics from a primary aerial image source supported by consultation with ancillary spatial data. This interpretation is conducted from a desktop computer in ArcGIS Pro and requires the acquisition of the best available data, skilled GIS personnel. Consequently, a great deal of emphasis is placed on the quality and interpretation of the data. Standard image analysis methodologies were used for landscape level wetland assessment and habitat characterization by applying the FGDC Standards (FGDC-STD-015-2009, FGDC 2009; FGDC-STD-004-2013, FGDC 2013). The accuracy and potential limitations of the King County wetland mapping and classification were addressed by the application of the quality assurance plan. This plan was developed using the FGDC Standards (FGDC-STD-015-2009, FGDC 2009; FGDC-STD-004-2013, FGDC 2013) established for the NWI and in accordance with Environmental Protection Agency (EPA) guidance (EPA 2003). The King County Wetland Inventory Updated should be considered a “snapshot in time”, as the dynamic landscape of King County is frequently changing due to both natural processes and human manipulation.
- Access Rights
- Public
- Format
- ArcGIS FeatureLayer
- Language
- English
- Date Added
- January 09, 2026
- Provenance Statement
- The metadata for this resource was last retrieved from King County GIS Open Data on 2026-01-08.
Resource Class
Resource Type
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Location
Cite and Reference
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Citation
King County (2025). King County NWI Wetlands with LLWW, HGM and Function Attributes [Washington (State)--King County]. King County GIS Open Data. (web service) -
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