UMCES Appalachian Laboratory Not published vector digital data 02070010_streams 02070010_streams withheld ESRI ArcCatalog 9.3.1.1850 en Stream network density exerts a strong control on hydrologic processes in watersheds, yet existing stream maps in the mid-Atlantic region fail to capture stream network density with sufficient accuracy for most applications. Hydrography data for this data set were produced through a model workflow that predicts stream presence and absence from field observations of headwater stream channels and maximum entropy models (MaxEnt), commonly implemented in biogeographical studies to model species distributions. Training data originated with 256 field observations of channel heads (most up-slope evidence of concentrated water flow and sediment transport between definable banks) spanning the entire physiographic range of the study region. These data were expanded by assuming stream presence at all locations down flow direction from the observed channel heads. Streams were constrained to be a single pixel wide (10-m) and to flow along flowlines in the National Hydrography Dataset (NHD). The final training data set consisted of 10,520 stream segments, each 10-m long. Landscape variables (slope, soil silt-clay fraction, plan and profile curvature and flow accumulation area) were calculated for each 10-m pixel, continuously accumulated along hydrologic flowpaths, and used as dependent variables in the MaxEnt stream distribution model. In validation, the model correctly predicts the presence of 91% of all 10-m stream segments and increases stream length over the NHD in most areas. The accuracy of any one prediction of stream presence increases with flow accumulation area, with most of the errors accumulating in streams with a catchment area smaller than 15 ha. The resulting data cover the entire Potomac River Basin (37,800 km2) and several large basins adjacent to the Potomac Basin that were included to cover all of Maryland west of the Chesapeake Bay. These data are expected to augment and in some cases replace current maps of streams provided by the high-resolution (1:24,000) National Hydrography Dataset (NHD). For synoptic evaluations of stream density and stream length, these data are superior to the NHD in two main respects. (1) Streams with a catchment area smaller than 10,000 ha are not always included in the NHD. The new data are expected to be most useful when studying streams with a catchment area in the range of 100 to 10,000 ha. (2) In highly urbanized areas, many streams were buried beneath development prior to the production of the first US stream maps. Because we used digital elevation models to predict the location of streams, buried streams appear in the new stream maps despite no current surface expression. Despite these improvements, care should be taken when attempting to understand stream density or stream presence and absence in small study areas. The location of small streams is difficult to predict and field validation should be used in cases where model error could lead to significant errors in subsequent analyses. publication date REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground. In work As needed none headwater channel head streams zero order NHD HUC Maryland Virginia Pennsylvannia Potomac Mid-Atantic none 02070010 Middle Potomac-Anacostia-Occoquan surface water none streams none modern Restricted. Data set is in process of use case evaluation and QA testing and documentation. Recipients should contact producer before distributing in order to recieve the current version For testing and evaluation only. Current version is still in Beta form, no guarantee for validity and consistancy. Shapefile University of Maryland Center for Environmental Science Appalachian Laboratory Steven M Guinn GIS Specialist mailing and physical address
301 Braddock Rd.
Frostburg MD 21532 USA 3016897146 sguinn@umces.edu Restricted Data and metadata still being reviewed -77.860617 -76.802332 39.204395 38.511588 252914.234512 342904.234512 4266385.747106 4341035.747106 Local Area Network 002 withheld 15.196 Shapefile Shapefile 0.000 ~15m Based on the error of the DEM and NHD datasets NA Metadata imported. withheld 20120216 14292600 Esri ArcGIS 13.0.3.36057 ZeroOrder_StatewideMerge_Upload 252914.234512 342904.234512 4341035.747106 4266385.747106 1 -77.860617 -76.802332 39.204395 38.511588 1 Stream network density exerts a strong control on hydrologic processes in watersheds, yet existing stream maps in the mid-Atlantic region fail to capture stream network density with sufficient accuracy for most applications. Hydrography data for this data set were produced through a model workflow that predicts stream presence and absence from field observations of headwater stream channels and maximum entropy models (MaxEnt), commonly implemented in biogeographical studies to model species distributions. Training data originated with 256 field observations of channel heads (most up-slope evidence of concentrated water flow and sediment transport between definable banks) spanning the entire physiographic range of the study region. These data were expanded by assuming stream presence at all locations down flow direction from the observed channel heads. Streams were constrained to be a single pixel wide (10-m) and to flow along flowlines in the National Hydrography Dataset (NHD). The final training data set consisted of 10,520 stream segments, each 10-m long. Landscape variables (slope, soil silt-clay fraction, plan and profile curvature and flow accumulation area) were calculated for each 10-m pixel, continuously accumulated along hydrologic flowpaths, and used as dependent variables in the MaxEnt stream distribution model. In validation, the model correctly predicts the presence of 91% of all 10-m stream segments and increases stream length over the NHD in most areas. The accuracy of any one prediction of stream presence increases with flow accumulation area, with most of the errors accumulating in streams with a catchment area smaller than 15 ha. The resulting data cover the entire Potomac River Basin (37,800 km2) and several large basins adjacent to the Potomac Basin that were included to cover all of Maryland west of the Chesapeake Bay.These data are expected to augment and in some cases replace current maps of streams provided by the high-resolution (1:24,000) National Hydrography Dataset (NHD). For synoptic evaluations of stream density and stream length, these data are superior to the NHD in two main respects. (1) Streams with a catchment area smaller than 10,000 ha are not always included in the NHD. The new data are expected to be most useful when studying streams with a catchment area in the range of 100 to 10,000 ha. (2) In highly urbanized areas, many streams were buried beneath development prior to the production of the first US stream maps. Because we used digital elevation models to predict the location of streams, buried streams appear in the new stream maps despite no current surface expression. Despite these improvements, care should be taken when attempting to understand stream density or stream presence and absence in small study areas. The location of small streams is difficult to predict and field validation should be used in cases where model error could lead to significant errors in subsequent analyses.headwaterchannel headstreamszero orderNHDHUCMarylandVirginiaPennsylvanniaPotomacMid-Atantic02070010Middle Potomac-Anacostia-Occoquan en FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time REQUIRED: The person responsible for the metadata information. REQUIRED: The organization responsible for the metadata information. REQUIRED: The mailing and/or physical address for the organization or individual. REQUIRED: The city of the address. REQUIRED: The state or province of the address. REQUIRED: The ZIP or other postal code of the address. REQUIRED: The telephone number by which individuals can speak to the organization or individual. 20120228 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset Downloadable Data 15.196 15.196 Contact Producers UMCES Appalachian Laboratory Steven M Guinn GIS Specialist 30168917146 sguinn@umces.edu Vector Simple FALSE 0 FALSE FALSE Feature Class 0 Synthetically delineated stream network ZeroOrder_StatewideMerge_Upload FID FID OID 4 0 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 0 0 0 Feature geometry. ESRI Coordinates defining the features. Length Length Double 17 Length of the link http://hydrology.usu.edu/mwdtool/MWDManual.pdf meters 16 1 Slope Slope Double 19 Average slope of the link (computed as drop/length) http://hydrology.usu.edu/mwdtool/MWDManual.pdf run/rise 18 12 Straight_L Straight_L Double 17 Straight line distance from the start to the end of the link http://hydrology.usu.edu/mwdtool/MWDManual.pdf meters 16 1 20250709 20250709 17121600 {0A4397EA-FBB3-45EE-B40B-666CCC0B5E6A} 20120216 14292600 FALSE 20250709 17121600 ZeroOrder_StatewideMerge_Upload 002 0.000 https://www.arcgis.com/sharing/rest/content/items/66af884c0e4b42c288e8942d1872d20f/info/thumbnail/ago_downloaded.png Projected GCS_WGS_1984 Linear Unit: Meter (1.000000) WGS_1984_UTM_Zone_18N <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' 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