PowerPoint Presentation - Skagit County, Washington...Use existing data Past data! Only have to...
Transcript of PowerPoint Presentation - Skagit County, Washington...Use existing data Past data! Only have to...
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VSP 2015
Joshua Greenberg Skagit County GIS
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GOALS
Salmon Policy Resolution directed the county’s Geographic Information Systems (GIS) department to undertake a large-scale mapping project of riparian areas • Existing riparian buffers • Existing roads, buildings and structures that
would preclude riparian buffers
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STEPS
1.Determine Study area 2.Update hydrology data 3.Delineate Land Use 4.Run Analysis
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Study Area
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Study Area
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Study Area
STREAM TYPES: OLD: 1,2,3,4 NEW: Shoreline/ Fish / Perennial stream
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Study Area Exclude Skagit Delta
Dike and Drain Districts Drainage & Fish Initiative
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Determine areas to evaluate Update Hydrology locations
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2007 Image 2013 Image
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Pictometry Images
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CLASSES
Agricultural Land use – Crop/Dirt Field – Forested Pasture – Mowed/Grazed Field
Non-Agricultural Land Use – General Wetland – Grassland/Field – Low Shrub/Tree – Deciduous Trees – Mixed Trees – Evergreen Trees – Residential – Commercial – Building – Road – Timber Harvest – Dike – Open Water
Non-Agricultural Land Use – General Wetland – Grassland/Field – Low Shrub/Tree – Deciduous Trees – Mixed Trees – Evergreen Trees – Residential – Commercial – Building – Road – Timber Harvest – Dike – Open Water
Trees
Developed
Other
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Using other GIS databases, the project team identified existing areas of protected riparian area. Possible classifications included parks, USFS land, conservation easements, and CREP‐rental lands.
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1030 hours to complete 3 staff
16,090 acres digitized
•Evaluate 300’ from selected streams •424 Miles of stream •16,090 acres digitized
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Analysis
“Standard” buffer widths; Type 1 & 2 – 200 feet Type 3 – 100 feet Type 4 – 50 feet
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Analysis
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Analysis
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Analysis
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FUNCTIONAL VALUE 64.2 Acres of the
standard buffer are “non-functional”
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Standard Buffer: Agriculture 1,766 (22% of buffer) 42 Acres Protected 75 Acres Public Lands 64.2 Acres non-functional (~2% of buffer)
68% of the Agriculture acres are in Nookachamps and Middle Skagit regions.
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GOALS
• Look at change in Land Cover 2011 – 2015 • Ag-Nrl and RRc-Nrl Zones (including delta!)
• Additional 302 miles of stream/ditches • Stream Types S, F • Update stream location
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ADDITIONAL AREA
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METHOD
Heads up digitize areas that have changed that were previously Forest, Shrub, or Grass OR changed to Forest, Shrub, or Grass In 2011 and 2015 images
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ADVANTAGES
Use existing data Past data! Only have to measure change High level of accuracy Detail of landcover