Layer: Riparian High Value Habitat (ID: 34)

Parent Layer: High Value Habitat (RCS)

Name: Riparian High Value Habitat

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Description: This layer only displays the Highest values of those areas evaluated. The Riparian Habitat Model describes riparian habitat value for conservation purposes. Over 400,000 acres were evaluated, though this data only shows the highest values. We decided to display these values in a continues ramp from High - Highest values. The Riparian Habitat Model is calculated:Riparian = FEMA floodplains + NHD stream buffers + Other stream buffers + Wetland buffers Executive SummaryPrior to November 2010, when The Intertwine Alliance launched the Regional Conservation Strategy (RCS) and Biodiversity Guide (RBG) efforts for the Portland-Vancouver metropolitan region, conservation priorities in the metropolitan region were identified at a broad regional scale that generally excluded urban areas (e.g., state conservation strategies and Willamette Synthesis); were regional but based solely on expert opinion (e.g., Natural Features); and consisted of localized priorities that abruptly ended at jurisdiction boundaries. The goal of the RCS was to fill in the gaps between broad and local scales of information related to conservation priorities. RCS members envisioned a data-driven approach that could add a regional perspective to local efforts and facilitate cross-scale cooperation toward protecting remaining valuable habitat in the Portland-Vancouver metropolitan region. Also, RCS members expected that the product would complement rather than replace local knowledge, by validating what is known and expanding to areas that are less well known.The RCS Technical Working Group hired the Institute for Natural Resources to develop a land cover layer at a spatial resolution appropriate for highly fragmented areas (5m versus the typical 30m), then to develop a conservation priority model that addressed both aquatic and terrestrial conservation needs. Several key products resulted from the project: the High-value Habitat Model describing high-value terrestrial habitat within the metropolitan region, the Riparian Habitat Model describing high-value habitat adjacent to streams and rivers, and the high spatial resolution land cover data set describing land cover at a 5 m spatial resolution. In June 2011, INR completed an initial proof-of-concept product describing high value conservation areas in the Portland-Vancouver region. The product demonstrated a methodology that enabled stakeholder involvement while also being data-driven. In May 2012, a second version of this product was completed. While the product is considered final at this time, it is expected and hoped that the models and data will be updated and improved upon into the future as more funds and better information becomes available so that the product functions as a “living work” rather than a one-time snapshot in time.Among the data used, the habitat prioritization modeling makes use of multiple data sets including high, 5 m spatial resolution imagery, improving on past efforts that were mapped at 30 m spatial resolution and nationally available data. The 5 m spatial resolution allows users to distinguish individual features on the landscape, such as large tree canopies. Because urban landscapes are widely diverse in terms of the vegetation types and types of surfaces (e.g., sidewalks, rooftops, plants, etc.), and many materials may be located in small areas, high resolution spatial data is essential to understanding and cataloging urban areas. The nationally available data allows the products to use spatially consistent data across the whole metropolitan region. Local data sets were used to supplement region-wide data sets. Data SummaryThe Riparian Habitat layer was developed by overlaying four ranked data sets in ArcGIS using the "Calculate Riparian Metric" tool produced for this project. The four layers used were: NHD stream buffers, other stream buffers, FEMA floodplains, 100 year, and Wetland buffers. The NHD stream buffers layer was developed using information on salmonid presence, flow velocity, and flow volume. The other stream buffers layer was developed using expert assigned buffers of influence based on stream types. FEMA floodplains were acquired from FEMA (http://msc.fema.gov). Wetlands were buffered by 30 m and excluded if farther than 200 m from a stream. Each input layer's ranking values were adjusted according to the surface runoff within their buffers and the path distance from feature edges to their buffer boundaries (within the buffers). The input layers were weighted and combined using the following scheme: Riparian = (NHD stream buffer * 0.175) + (Other stream buffers * 0.3) + (FEMA floodplain * 0.4) + (Wetland buffer * 0.125).Stream data sources used to develop this data set were National Hydrography Dataset (NHD; 1:100,000; http://nhd.usgs.gov/) and Oregon Department of Geology and Mines (http://www.oregongeology.org). Fish distribution data were obtained from the StreamNet database (http://www.streamnet.org). FEMA 100 year floodplains were downloaded from the FEMA Map Service Center (http://msc.fema.gov). Wetlands data were obtained from the Oregon Biodiversity Information Center and Oregon Explorer (http://oregonexplorer.info/wetlands/DataCollections/GeospatialData). Surface runoff was estimated using land cover classes described in the Intertwine High Spatial Resolution Land Cover data set (IHSRLC). Data version: Riparian_1_05

Copyright Text: Institute for Natural Resources, Clean Water Services, METRO, Clark County GIS

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