{ "currentVersion": 11.3, "cimVersion": "3.3.0", "id": 38, "name": "Stream Environment Zone - Assessment Unit", "type": "Feature Layer", "description": "
Brief Methods: <\/SPAN><\/SPAN><\/P> In version 2 of the Sierra Nevada Multi-source Meadow Polygons Compilation, polygon boundaries from the original layer (SNMMPC_v1 - https://meadows.ucdavis.edu/data/4) were updated using \u2018heads-up\u2019 digitization from high-resolution (1m) NAIP imagery. In version 1, only polygons larger than one acre were retained in the published layer. In version 2, existing polygon boundaries were split, reduced in size, or merged, and additional polygons not captured in the original layer were digitized. If split, original IDs from version 1 were retained for one half and a new ID was created for the other half. In instances where adjacent meadows were merged together, only one ID was retained and the unused ID was \u201cdecommissioned\u201d. If digitized, a new sequential ID was assigned. <\/SPAN><\/P> <\/P> <\/P> Acknowledgements<\/SPAN><\/SPAN><\/P> Tim Lindemann, Dave Weixelman, Carol Clark, Stacey Mikulovsky, Qiqi Jiang, Joel Grapentine, Kirk Evans - USDA Forest Service, Pacific Southwest Region <\/SPAN><\/P> Wes Kitlasten - U.S. Geological Survey <\/SPAN><\/SPAN><\/P> Sarah Yarnell, Ryan Peek, Nick Santos - UC Davis, Center for Watershed Sciences <\/SPAN><\/P> Anna Fryjoff-Hung - UC Merced <\/SPAN><\/SPAN><\/P> <\/P> <\/P> <\/P> Meadow Polygon Attributes <\/SPAN><\/SPAN><\/P> <\/P> Field<\/SPAN><\/SPAN><\/P><\/TD> Description<\/SPAN><\/SPAN><\/P><\/TD><\/TR> AREA_ACRE<\/SPAN><\/SPAN><\/P><\/TD> Meadow area in acres<\/SPAN><\/SPAN><\/P><\/TD><\/TR> STATE<\/SPAN><\/SPAN><\/P><\/TD> State in which the meadow is located (CA or NV)<\/SPAN><\/SPAN><\/P><\/TD><\/TR> ID*<\/SPAN><\/SPAN><\/P><\/TD> Unique meadow identifier UCDSNMxxxxxx<\/SPAN><\/SPAN><\/P> *Note: IDs are non-sequential* <\/SPAN><\/SPAN><\/P><\/TD><\/TR> HUC12<\/SPAN><\/SPAN><\/P><\/TD> Unique identifier for the Hydrologic Unit Code (HUC), level 12, in which the meadow is located<\/SPAN><\/SPAN><\/P><\/TD><\/TR> OWNERSHIP<\/SPAN><\/SPAN><\/P><\/TD> Land ownership status (multiple sources)<\/SPAN><\/SPAN><\/P><\/TD><\/TR> EDGE_COMPLEXITY<\/SPAN><\/SPAN><\/P><\/TD> Gives an indication of the meadow's exposure to external conditions EDGE COMPLEXITY = (MEADOWperimeter/EAC perimeter) [EAC = Equal Area Circle]<\/SPAN><\/SPAN><\/P><\/TD><\/TR> DOM_ROCKTYPE<\/SPAN><\/SPAN><\/P><\/TD> Dominant rock type on which the meadow is located <\/SPAN><\/SPAN>based on the USGS layer<\/SPAN><\/SPAN><\/P><\/TD><\/TR> VEG_MAJORITY<\/SPAN><\/SPAN><\/P><\/TD> Vegetation majority based on the LANDFIRE layer (GROUPVEG attribute)<\/SPAN><\/SPAN><\/P><\/TD><\/TR> SOIL_SURVEY<\/SPAN><\/SPAN><\/P><\/TD> Soil survey from which SOIL_COKEY, MAPUNIT_Kf, MAPUNIT_ClayTot_r, SOIL_MUKEY, and SOIL_COMP_NAME were assigned to each meadow (SSURGO or STATSGO depending on layer coverage)<\/SPAN><\/SPAN><\/P><\/TD><\/TR> SOIL_MUKEY<\/SPAN><\/SPAN><\/P><\/TD> Mapunit Key: Unique identifier for the Mapunit in which the meadow is located<\/SPAN><\/SPAN><\/P><\/TD><\/TR> SOIL_COKEY<\/SPAN><\/SPAN><\/P><\/TD> Component Key: Unique identifier for the major component of the mapunit in which the meadow is located <\/SPAN><\/SPAN><\/P><\/TD><\/TR> SOIL_COMP_NAME<\/SPAN><\/SPAN><\/P><\/TD> Component Name: Name of the soil component with the highest representative value in the mapunit in which the meadow is located <\/SPAN><\/SPAN><\/P><\/TD><\/TR> MAPUNIT_Kf<\/SPAN><\/SPAN><\/P><\/TD> K factor: A soil erodibility factor that quantifies the susceptibility of soil particles to detachment by water. Low: 0.05-0.2 Moderate: 0.25-0.4, High: >0.4<\/SPAN><\/SPAN><\/P><\/TD><\/TR> MAPUNIT_ClayTot_r<\/SPAN><\/SPAN><\/P><\/TD> Representative value (%)of total clay<\/SPAN><\/SPAN><\/P><\/TD><\/TR> CATCHMENT_AREA<\/SPAN><\/SPAN><\/P><\/TD> The approximate area of the upstream catchment exiting through the meadow(sq. m)<\/SPAN><\/SPAN><\/P><\/TD><\/TR> ELEV_MEAN<\/SPAN><\/SPAN><\/P><\/TD> Mean elevation (m)<\/SPAN><\/SPAN><\/P><\/TD><\/TR> ELEV_RANGE<\/SPAN><\/SPAN><\/P><\/TD> Elevation range (m) across each meadow<\/SPAN><\/SPAN><\/P><\/TD><\/TR> ED_MIN_FStopo_ROADS<\/SPAN><\/SPAN><\/P><\/TD> Minimum Euclidean Distance (m) to Forest Service Topographic Map Data Transportation Roads <\/SPAN><\/SPAN><\/P><\/TD><\/TR> ED_MIN_FStopo_TRAILS<\/SPAN><\/SPAN><\/P><\/TD> Minimum Euclidean Distance (m) to Forest Service Topographic Map Data Transportation Trails <\/SPAN><\/SPAN><\/P><\/TD><\/TR> ED_MIN_LAKE<\/SPAN><\/SPAN><\/P><\/TD> Minimum Euclidean Distance (m) to lake edges <\/SPAN><\/SPAN><\/P><\/TD><\/TR> ED_MIN_FLOW<\/SPAN><\/SPAN><\/P><\/TD> Minimum Euclidean Distance (m) to NHD Streams/Rivers <\/SPAN><\/SPAN><\/P><\/TD><\/TR> ED_MIN_SEEP<\/SPAN><\/SPAN><\/P><\/TD> Minimum Euclidean Distance (m) to NHD Seeps/Springs <\/SPAN><\/SPAN><\/P><\/TD><\/TR> MDW_DEM_SLOPE<\/SPAN><\/SPAN><\/P><\/TD> Median DEM based slope (in degrees)<\/SPAN><\/SPAN><\/P><\/TD><\/TR> STRM_SLOPE_GRADE<\/SPAN><\/SPAN><\/P><\/TD> Length-weighted average slope of all NHD flowline segments in each meadow. Given for meadows with flowlines. Meadows without flowlines are null for this attribute.<\/SPAN><\/SPAN><\/P><\/TD><\/TR> POUR_POINT_LAT<\/SPAN><\/SPAN><\/P><\/TD> Latitude of the lowest point along a flowline at which water flows out of the meadow <\/SPAN><\/SPAN>in decimal degrees<\/SPAN><\/SPAN>(meadow with no flowline has null value) <\/SPAN><\/SPAN><\/P><\/TD><\/TR> POUR_POINT_LON<\/SPAN><\/SPAN><\/P><\/TD> Longitude of the lowest point along a flowline at which water flows out of the meadow <\/SPAN><\/SPAN>in decimal degrees<\/SPAN><\/SPAN>(meadow with no flowline has null value) <\/SPAN><\/SPAN><\/P><\/TD><\/TR> HGM_Type<\/SPAN><\/SPAN><\/P><\/TD> Dominant meadow hydrogeomorphic (HGM) type <\/SPAN><\/SPAN><\/P><\/TD><\/TR> LAT_DD<\/SPAN><\/SPAN><\/P><\/TD> Latitude of polygon centroid in decimal degrees<\/SPAN><\/SPAN><\/P><\/TD><\/TR> LONG_DD<\/SPAN><\/SPAN><\/P><\/TD> Longitude of polygon centroid in decimal degrees<\/SPAN><\/SPAN><\/P><\/TD><\/TR> Shape_Length<\/SPAN><\/SPAN><\/P><\/TD> Meadow perimeter in meters<\/SPAN><\/SPAN><\/P><\/TD><\/TR> Shape_Area<\/SPAN><\/SPAN><\/P><\/TD> Meadow area in sq. meters<\/SPAN><\/SPAN><\/P><\/TD><\/TR> Detailed Attribute Descriptions:<\/SPAN><\/SPAN><\/P> <\/P> Geology<\/SPAN><\/SPAN><\/P> Field: DOM_ROCKTYPE<\/SPAN><\/SPAN><\/P> Data Source: USGS - <\/SPAN><\/SPAN>https://pubs.usgs.gov/of/2005/1305/<\/SPAN><\/SPAN><\/A><\/P> Dominant rock type was attributed to the meadow polygons based on available state geology layers. Using Zonal Statisitics in ArcGIS, the most abundant lithology in the map unit (ROCKTYPE1) was identified for each meadow. <\/SPAN><\/SPAN><\/P> Vegetation<\/SPAN><\/SPAN><\/P> Field: VEG_MAJORITY<\/SPAN><\/SPAN><\/P> Data Source: LANDFIRE - <\/SPAN><\/SPAN>https://www.landfire.gov/version_comparison.php?mosaic=Y<\/SPAN><\/SPAN><\/A><\/P> Using Zonal Statisitics in ArcGIS, the 2014 LANDFIRE dataset was used to attribute generalized vegetation (GROUPVEG) to the meadow polygons. <\/SPAN><\/SPAN><\/P> Soils<\/SPAN><\/SPAN><\/P> <\/P> Fields: SOIL_SURVEY, SOIL_MUKEY, SOIL_COKEY, SOIL_COMP_NAME, MAPUNIT_Kf, MAPUNIT_ClayTot_r<\/SPAN><\/SPAN><\/P> <\/P> Data Source: USDA, Natural Resources Conservation Service<\/SPAN><\/SPAN><\/P> SSURGO: <\/SPAN><\/SPAN>https://gdg.sc.egov.usda.gov/<\/SPAN><\/SPAN><\/A><\/P> STATSGO: <\/SPAN><\/SPAN>https://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm<\/SPAN><\/SPAN><\/A><\/P><\/TD> <\/TD><\/TR><\/TBODY><\/TABLE>