The primary purpose of this dataset is to provide a common, conformant streams coverage for NWS products and processes, including IHABBS and usages as map backgrounds for river forecasts for a variety of National Weather Service applications. This shapefile is a subset of
the rivers shapefile containing only major rivers.
Originator: National Operational Hydrologic Remote Sensing Center (NOHRSC)
Publication_Date: 199801
Title: IHABBS River File
Geospatial_Data_Presentation_Form: vector digital data
Source_Scale_Denominator: 250,000 and 500,000
Type_of_Source_Media: online
Source_Citation_Abbreviation: IHABBS
Source_Information:
Source_Citation:
Citation_Information:
Originator:
U.S. Environmental Protection Agency, Office of Science and Technology
Publication_Date: 20070611
Title:
U.S. EPA Reach File 1 (RF1) for the Conterminous United States in BASINS
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: U.S. Environmental Protection Agency
Source_Scale_Denominator: 250,000 and 500,000
Type_of_Source_Media: online
Source_Citation_Abbreviation: EPA River Reach
Process_Step:
Process_Description:
NOHRSC Process: This file was originally compiled by the EPA beginning in 1978 and completed in
1982. RF1 was digitized by EPA from aeronautical charts prepared by NOAA. NOAA initially developed these charts from photographic copies of stable-base scribe coat masters of the USGS maps which have a scale of 1:250,000. NOAA retained all hydrography shown on the USGS 1:250,000 maps but updated these maps to include more streams and waterbodies. The updates were based on remote sensing imagery and emphasis was placed on providing more hydrographic features on those maps that were "under par" relative to adjacent maps. Additionally, NOAA updated these maps on a continuing basis so that they would be current with changes, such as the construction of new reservoirs. (from EPA Reach File version 3.0 manual). This particular file underwent additional clean-up at USGS, consisting primarily of: (1) coverting shorelines to centerlines (no shorelines were retained as such in this file); (2) adjustment (flipping) of some arcs to establish correct directionality; and (3) some added or improved arc connectivity. (Rich Alexander, USGS, personal communication to Don Anderson, 24 May 1995). (December 1997 - Rob Poston): Since receiving the coverage from USGS, extensive cleaning and editing has been done by NOHRSC in 1996 and 1997. The following types of discrepancies were discovered and edited: a. multiple streams from a single source (more than one segment with the same FROM node; this is not always an error) b. multiple streams with no outlet (more than one segment with the same TO node and no outbound segment) c. circular streams (segments with FROM and TO nodes connected in a loop) d. gaps between arcs which should connect (undershoots) e. streams with upward flow of more than 100 meters elevation between two nodes (segments digitized in wrong direction) Many of the edits made by NOHRSC personnel involved clipping a segment, moving a node, removing a segment, or unravelling a tangled segment. These changes necessarily rendered some of the coverage attributes invalid; like SEGL (segment length) and ARBSUM (arbolate sum). No attempt has been made by NOHRSC to recalculate those invalid attributes. This dataset, ihabbsrf, contains just a subset of the original RF1 attributes. In addition, many (hundreds of) river segments have been shifted, shortened, and otherwise adjusted to achieve a better fit to the NOHRSC 15 arc-second DEM dataset. The 15 arc-second DEM was derived by averaging 5x5 cells from the original USGS 3 arc-second DEM. Therefore, although this dataset originated from the EPA's RF1 dataset, it now bears very little resemblence to its original form. The primary purpose of this dataset is to provide a common, conformant streams coverage for NOHRSC products and processes, including IHABBS. The NWS dataset, is another version of the ihabsrf data. The differences are that the format is a line shapefile, those attributes identified by NOHRSC as invalid were deleted and the topology attributes were deleted. It is expected that this dataset will be simplified/modified or replaced.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 60445
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Rivers
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: IHABBSRF_I
Attribute_Definition: IHABBS sequence number
Attribute:
Attribute_Label: RR
Attribute_Definition: Reach file id - Unique Identifier
Attribute:
Attribute_Label: HUC
Attribute_Definition: Hydrologic Unit Code
Attribute:
Attribute_Label: TYPE
Attribute_Definition: Reach type
Attribute:
Attribute_Label: PMILE
Attribute_Definition: Path mile
Attribute:
Attribute_Label: PNAME
Attribute_Definition: Primary Name
Attribute:
Attribute_Label: OWNAME
Attribute_Definition: Open water name
Attribute:
Attribute_Label: PNMCD
Attribute_Definition: Primary name code
Attribute:
Attribute_Label: OWNMCD
Attribute_Definition: Open Water Name Code
Attribute:
Attribute_Label: DSRR
Attribute_Definition: Downstream river reach
Attribute:
Attribute_Label: DSHUC
Attribute_Definition: Downstream HUC
Attribute:
Attribute_Label: USDIR
Attribute_Definition: Upstream reach direction
Attribute:
Attribute_Label: LEV
Attribute_Definition: Level
Attribute:
Attribute_Label: J
Attribute_Definition: Junction Number
Attribute:
Attribute_Label: TERMID
Attribute_Definition: Terminal Stream System Identifier
