Jennifer L. Krstolic
Sarah K. Martucci
Katharine J. Hopkins
Jeff P. Raffensperger
2005
SIR2005-5073_CBRWM_LandSegments
vector digital data
SIR
2005-5073
Baltimore, MD
US Geological Survey
Spatial data associated with the Scientific Investigations Report, 'Development of Land Segmentation, Stream-Reach Network, and Watersheds in Support of Hydrological Simulation Program-Fortran (HSPF) Modeling, Chesapeake Bay Watershed, and Adjacent Parts of Maryland, Delaware, and Virginia'
By Sarah K. Martucci, Jennifer L. Krstolic, and Jeff P. Raffensperger (U.S. Geological Survey), and Katharine J. Hopkins (University of Maryland Center for Environmental Science)
http://water.usgs.gov/lookup/getspatial?sir2005-5073_CBRWM_LandSegments
This data set is an ArcGIS shapefile depicting land segments in the Chesapeake Bay Watershed and adjacent states of New York, Pennsylvania, Maryland, West Virginia, Delaware, Virginia, North Carolina, and Tennessee. Land segmentation was based on county boundaries represented by a 1:100,000-scale digital dataset. Fifty of the 254 counties and incorporated cities in the model region were divided on the basis of physiography and topography, producing a total of 310 land segments. The data are projected to the UTM grid coordinate system - Zone 18 NAD27.
The U.S. Geological Survey, Chesapeake Bay Program, Interstate Commission on the Potomac River Basin, Maryland Department of the Environment, Virginia Department of Conservation and Recreation, and the University of Maryland are collaborating on the Chesapeake Bay Regional Watershed Model, using Hydrological Simulation Program - FORTRAN to simulate streamflow and concentrations and loads of nutrients and sediment. In order to establish a framework for model simulation, digital spatial datasets were created defining the discretization of the model region (including the Chesapeake Bay Watershed, as well as the adjacent parts of Maryland, Delaware, Virginia, Tennessee, and North Carolina outside the watershed) into land segments, a stream-reach network, and associated watersheds.
The purpose of the Chesapeake Bay land coverage is to represent the county political boundaries and areas of differing physiography and topography in the study area. These land segments are based on an existing 1:100,000-scale digital dataset for all states in the study area. Land segments and watersheds were intersected to create land-watershed segments for the model. The land segments are to be used with the Chesapeake Bay Regional Watershed Model. Other uses are not suggested.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology.
Related websites:
Chesapeake Bay Program Home:
http://www.chesapeakebay.net/index.cfm
Chesapeake Bay Program Modeling efforts:
http://www.chesapeakebay.net/model.htm
Chesapeake Bay Program work related to this GIS dataset:
http://www.chesapeakebay.net/phase5.htm
SPARROW Modeling and stream-reach network development
http://md.water.usgs.gov/publications/wrir-99-4054/
Maryland Department of the Environment (MDE)
http://www.mde.state.md.us/
Interstate Commission on the Potomac River Basin (ICPRB)
http://www.potomacriver.org/
Virginia Department of Conservation and Recreation (DCR)
http://www.dcr.state.va.us/
University of Maryland
http://www.umd.edu/
2005
publication date
As needed
-84.636451
-74.145544
44.097085
35.612716
ISO19119 Topic Category
inlandWaters
environment
farming
biota
none
County
Physiography
Elevation
Topography
HSPF model
Segmentation
Political Boundaries
none
Chesapeake Bay Watershed
DE
MD
NC
NY
PA
TN
VA
WV
2000-2005
none
These data are to be used with the Chesapeake Bay Regional Watershed Model or projects related to this work.
U.S. Geological Survey
Ask USGS ? Water Webserver Team
mailing and physical address
445 National Center
Reston
Virginia
20192
USA
1-888-275-8747 (1-888-ASK-USGS)
http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+SIR2005_5073_cbland
http://water.usgs.gov/GIS/browse/SIR2005-5073_Cbland.jpg
Land segments of the Chesapeake Bay Regional Watershed Model
JPEG
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535
Original data was in ArcInfo coverage format. Topology was built using either the Build command (01/26/2005). The data layer is "topologically clean" as tested with the ArcInfo Build command. Tolerances: Fuzzy = 0.974, Dangle = 0.00.
Shapefiles have been compared to the original dataset. Data was converted to shapefile format 07/08/2005.
US Counties were re-selected to represent only those completely within, or touching the boundary of the study area. All counties within the states of Virgina, Maryland, Delaware, and Pennsylvania were included. Only a selected set of counties from New York, West Virginia, Tennessee, and North Carolina were included. The rest of the counties within US Counties dataset were omited.
US Geological Survey, EROS Data Center
1999
National Elevation Dataset
1
raster digital data
Sioux Falls, SD
U.S. Geological Survey
http://gisdata.usgs.net/ned/
http://ned.usgs.gov/ned/ned.html
http://ned.usgs.gov
1999
publication date
NED
National Elevation Dataset (NED) was contoured and used to define areas of great relief. Counties with large differences in topography or geology were split so that county-scale rainfall data and other data could be distributed based on these differences.
U.S. Department of Commerce Bureau of Census
1993
not specified
1:100,000-scale counties of the United States
Edition 1.1
vector digital data
U.S. Geological Survey, accessed November 16, 2004
http://water.usgs.gov/lookup/getspatial?county100
1993
publication date
US Counties
The Counties of the United States served as the base for the land segments.
U.S. Geological Survey,
1980
Physiographic Provinces of Virginia: prov2m_ugs, 1:2,000,000 scale
vector digital data
Available through the Virginia Water USGS office
1980
ground condition
Physiographic Provinces, VA
The Physiographic Province boundaries in Virginia were used as a guide for changes in topography. Counties with large differences in topography or geology were split so that county-scale rainfall data and other data could be distributed based on these differences.
U.S. Geological Survey
2000
Hydrogeomorphic Regions in the Chesapeake Bay Watershed
1
Open-File Report
00-424
Maryland
U.S. Geological Survey
Brakebill, J.W., and Kelley, S.K., 2000, Version 1: U.S. Geological Survey Open-File Report 00-424, accessed November 16, 2004 at
http://water.usgs.gov/lookup/getspatial?hgmr
2000
publication date
HGMR
Hydrogeomorphic Regions were used to differentiate between areas of great relief and differences in geology. Counties with large differences in topography or geology were split so that county-scale rainfall data and other data could be distributed based on these differences.
U.S. Census Bureau Geography Division
2004
not specified
Significant changes to counties and county equivalent entities: 1970-present
not specified
vector digital data
http://www.census.gov/geo/www/tiger/ctychng.html
2004
publication date
Census county and city changes
Used to update boundaries of incorporated cities to reflect land acquisition since the publication date of the county dataset.
1:100,000-scale counties of the United States projected to UTM zone 18, NAD83, and reselected for study area. Only counties within the Chesapeake Bay or adjacent land in NY, PA, MD, DE, WV, VA, NC, and TN were included.
2003
Polygons divided into 2-3 parts through on-screen editing, if determined necessary. Large differences in physography or topography were used to determine whether a polygon should be divided. Various sources used in each state. See source information for details.
Physiographic Provinces, VA
HGMR
NED
2003
Incorporated cities and counties were updated with Census 2000 boundaries.
Census County and City Changes
2003
Vector
Complete chain
969
Label point
310
GT-polygon composed of chains
310
Point
4
Universal Transverse Mercator
18
0.999600
-75.000000
0.000000
500000.000000
0.000000
coordinate pair
0.000434
0.000434
meters
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
CB_land.pat
Polygon Attribute Table
ESRI
FID
Internal feature number.
ESRI
Coordinates defining the features.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
AREA
polygon area
ESRI
0
undetermined maximum
square meters
PERIMETER
length of outer boundary
ESRI
0
undetermined maximum
meters
CB_LAND#
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
CB_LAND-ID
User-defined feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
STATECTY
Federal Information Processing Standard codes representing State and County, numerical code
U.S. Census Bureau Geography Division
FIPS CODES
U.S. Census Bureau Geography Division
ST
State abreviation
U.S. Census Bureau Geography Division
State abreviations
U.S. Census Bureau Geography Division
CNTYNAME
County name
U.S. Census Bureau Geography Division
County names
U.S. Census Bureau Geography Division
FIPS2
FIPS code with a '1' or '2' prior to the number to show that a county has been divided. 1= county has been divided, and is equivalent to a 'B' in the FIPSAB attribute. 2 = a county has been divided twice, and is equivalent to a 'C' in the FIPSAB attribute. Counties that have a part represnted by '2FIPS' also have '1FIPS' and 'FIPS' parts.
Data set developer
Adaptation on FIPS codes with 1 or 2 in front
PROV
Physiographic province code
U.S. Geological Survey
CP
coastal Plain
U.S. Geological Survey
VR
Valley and Ridge
U.S. Geological Survey
PD
Piedmont
U.S. Geological Survey
AP
Appalachian Plateau
U.S. Geological Survey
BR
Blue Ridge
U.S. Geological Survey
FIPSAB
FIPS code with and 'A', 'B', or 'C' in front. A= All counties are represented with and 'A'. A indicates a whole county, or portion of a divided county, B= portion of a divided county, C= portion of a county that has been divided twice. If there is a 'C' there always is a 'B' and an 'A'.
data set developer
Adaptation on FIPS codes with A, B, or C in front
U.S. Geological Survey
Ask USGS -- Water Webserver Team
mailing address
445 National Center
Reston
VA
20192
USA
1-888-275-8747 (1-888-ASK-USGS)
http://water.usgs.gov/user_feedback_form.html
Downloadable Data
Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
ARCE
Polygon coverage
zipped
1276 KB
http://water.usgs.gov/GIS/dsdl/sir2005-5073_land_e00.zip
Shapefile
multiple parts with the same base name, and different extensions.
zipped Shapefile named cb_land_shape.zip
1760 KB
http://water.usgs.gov/GIS/dsdl/sir2005-5073_land_shape.zip
SDTS
Zipped SDTS format named cb_land_SDTS.zip
1100 KB
http://water.usgs.gov/GIS/dsdl/sir2005-5073_land_sdts.zip
none. This dataset is provided by USGS as a public service
20050415
U.S. Geological Survey
Ask USGS -- Water Webserver Team
mailing address
445 National Center
Reston
VA
20192
USA
1-888-275-8747 (1-888-ASK-USGS)
http://water.usgs.gov/user_feedback_form.html
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998