U.S. Geological Survey or another mapping agency in cooperation with USGS.
Unknown
Hypsography, Digital Line Graphs (1:24,000)
Reston, Virginia
U.S. Geological Survey
DLGs can be downloaded from <URL:http://wvgis.wvu.edu/>.
This metadata is meant to describe the hypsography layer of DLGs, but may contain information on other DLG layers. Digital line graph (DLG) data are digital representations of cartographic information. DLG's of map features are converted to digital form from maps and related sources. Large-scale DLG data are available from the West Virginia University GIS Technical Center in six categories: (1) hypsography, (2) hydrography, (3) boundaries, (4) miscellaneous transportation (pipe and transmission lines), (5) roads, (6) railroads. All DLG data distributed by the USGS are DLG - Level 3 (DLG-3), which means the data contain a full range of attribute codes, have full topological structuring, and have passed certain quality-control checks. The files available from the West Virginia University GIS Technical Center are full dlg3 (USGS approved). Files are currently available in dlg and E00 format.
DLG's depict information about geographic features on or near the surface of the Earth, terrain, and political and administrative units. These data were collected as part of the National Mapping Program.
20031022
Last data update
Irregular
-83.0
-77.5
41.0
37.0
None
digital line graph
DLG
hypsography
contours
elevation
spot elevations
E00
U.S. Department of Commerce, 1977, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions (Federal Information Processing Standard 10-3):Washington, D.C., National Institute of Standards and Technology.
US
U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of The United States, and associated areas (Federal Information Processing Standard 5-2):Washington ,D.C., National Institute of Standards and Technology.
West Virginia
Addison
Adolph
Adrian
Alderson
Alton
Alum Creek
Amherstdale
Amonate
Anawalt
Annamoriah
Ansted
Anthony
Antioch
Apple Grove
Arlee
Arnett
Artemas
Asbury
Athalia
Athens
Auburn
Audra
Aurora
Baileysville
Bancroft
Barboursville
Barnabus
Beckley
Beckwith
Belington
Bellegrove
Belle
Belmont
Bens Run
Bentree
Bergoo
Berlin
Berryville
Bethany
Beverly East
Beverly West
Big Chimney
Big Creek
Big Isaac
Big Pool
Big Run
Blacksville
Blackwater Falls
Blackbird Knob
Blue Creek
Bowden
Bradshaw
Bramwell
Branchland
Brandonville
Brownton
Bruceton Mills
Buckhannon
Burnt House
Burnaugh
Burnsville
Businessburg
Camden
Cameron
Camden On Gauley
Cassity
Cass
Catlettsburg
Cedarville
Cedar Grove
Center Point
Century
Charleston East
Chapmanville
Charles Town
Charleston West
Cherry Run
Cheshire
Chester
Chloe
Circleville
Clarksburg
Clay
Clendenin
Clio
Clothier
Colebank
Coolville
Corliss
Cornstalk
Cowen
Craigsville
Crab Orchard
Cresaptown
Crumpler
Cumberland
Cuzzart
Danese
Davis
Davy
Dawson
Delbarton
Diana
Dorothy
Droop
Duo
Durbin
East Liverpool North
East Liverpool South
Eccles
Edray
Elkhurst
Elkins
Ellamore
Elmwood
Erbacon
Eskdale
Evitts Creek
Fairmont East
Fairmont West
Fallsburg
Fayetteville
Fellowsville
Flat Top
Folsom
Forest Hill
Fork Mountain
Fort Spring
Gallipolis
Gap Mills
Garretts Bend
Gary
Gassaway
Gauley Bridge
Gilbert
Gilboa
Gilmer
Gladesville
Glady
Glen Easton
Glenville
Glenwood
Glover Gap
Gorman
Goshen
Grafton
Grantsville
Grant Town
Green Bank
Great Cacapon
Greenville
Greenland Gap
Griffithsville
Hacker Valley
Hager
Hamlin
Hancock
Harpers Ferry
Harman
Hedgesville
Henlawson
Herold
Hinton
Holden
Hopeville
Hundred
Huntington
Hurricane
Iaeger
Inwood
Ivydale
Julian
Junior
Keedysville
Kenna
Kermit
Kettle
Keystone
Kiahsville
Kingwood
Kitzmiller
Knoxville
Lake Lynn
Laneville
Lavalette
Lead Mine
Lerona
Lester
Little Birch
Little Hocking
Littleton
Lobelia
Lockwood
Logan
Lorado
Louisa
Lubeck
Madison
Majestic
Majorsville
Mallory
Mammoth
Mannington
Man
Marietta
Martinsburg
Masontown
Matewan
Matheny
Matoaka
McGraws
Meadow Bridge
Meadow Creek
Middlebourne
Middleway
Mill Creek
Millstone
Milo
Milton
Mingo
Montgomery
Montrose
Morgantown North
Morgantown South
Mount Storm Lake
Mount Alto
Mount Clare
Moundsville
Mount Nebo
Mount Olive
Mount Storm
Mozark Mountain
Mud
Mullens
Myrtle
Naugatuck
Nestlow
Nestorville
Nettie
Newburg
New Haven
New Martinsville
New Matamoras
New Milton
Newton
Newville
Normantown
Oak Hill
Oakland
Oceana
Odd
Oldtown
Orlando
Osage
Oxford
Paden City
Panther
Parkersburg
Parsons
Patterson Creek
Patterson
Paw Paw
Pax
Pennsboro
Peterson
Peterstown
Philippi
Pickens
Pilot Knob
Pineville
Pine Grove
Pipestem
Pocatalico
Pomeroy
Pond Creek
Porters Falls
Portland
Powellton
Powhatan Point
Prichard
Prince
Pullman
Quick
Quinwood
Racine
Radnor
Rainelle
Ranger
Ravenswood
Raven Rock
Rhodell
Richwood
Rivesville
Roanoke
Robertsburg
Rock Cave
Romance
Ronceverte
Rosedale
Rosemont
Round Bottom
Round Hill
Rowlesburg
Rupert
Saint Albans
Saint George
Salem
Samp
Sang Run
Scott Depot
Sharp Knob
Shady Spring
Shepherdstown
Shinnston
Shirley
Sinks of Gandy
Sissonville
Skelt
Smithburg
Smithville
Snyder Knob
Spruce Knob
Steubenville East
Steubenville West
Strange Creek
Summersville Dam
Summersville
Sutton
Swandale
Sylvester
Table Rock
Talcott
Tanner
Tazewell North
Terra Alta
Thornton
Thurmond
Tiltonsville
Tioga
Trace
Trout
Union
Vadis
Valley Grove
Valley Head
Valley Mills
Valley Point
Wadestown
Walkersville
Wallace
War
Wayne
Webb
Webster Springs
Weirton
Welch
Wellsville
West Hamlin
West Milford
Webster Springs SE
Webster Springs SW
Westernport
Weston
West Union
Wharncliffe
Wharton
Wheeling
Whitesville
Whitmer
Widen
Williamsburg
Wilsondale
Wildell
Wileyville
Willow Island
Williams Mountain
Williamsport
Williamson
Winfield
Winona
Winslow
Wolf Summit
Woodrow
None
Acknowledgement of the West Virginia State GIS Technical Center would be appreciated in products derived from these data. The West Virginia State GIS Technical Center cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers.
West Virginia GIS Technical Center
Mailing and physical address
Department of Geology and Geography
307 White Hall, POB 6300
Morgantown
West Virginia
26506-6300
U.S.A.
1 304 293 5603 ext 4336
WVGIS@wvu.edu
The attribute accuracy is estimated to be 98.5 percent. Attribute accuracy was tested by one or more of the following methods:
- manual comparison of the source with hard copy plots.
- symbolized display of the digital line graph on an interactive computer graphic system.
- Selected attributes that could not be visually verified on plots or on screen, were interactively queried and verified on screen.
In addition, U.S. Geological Survey (USGS) Production System (PROSYS) software tested the attributes against a master set of valid attributes for the category; it also checked for selected valid attribute combinations, and for valid attributes relative to topology and dimensionality. All attribute data conform to the attribute codes current as of the date of digitizing.
Topological requirements include: lines must begin and end at nodes, lines must connect to each other at nodes, lines do not extend through nodes, left and right areas are defined for each line element and are consistent throughout the file, and the lines representing the limits of the file (neatline) are free of gaps.
The tests of logical consistency were performed by the USGS PROSYS program. The neatline was generated by connecting the four corners of the digital file, as established during initialization of the digital file. All data outside the enclosed region were ignored and all data crossing these geographically straight lines were clipped at the neatline. Data within a specified tolerance of the neatline were snapped to the neatline. Neatline straightening aligned the digitized edges of the digital data with the generated neatline, that is, with the longitude/latitude lines in geographic coordinates. All internal areas were tested for closure using PROSYS.
Data completeness reflects the content of the source quadrangle. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints.
For Digital Revision Status = Not revised
Reported data completeness reflects the content of the source quadrangle. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints.
For Digital Revision Status = Limited Update
This file has undergone limited update digital revision. The file contains only (1) those features that are photoidentifiable on monoscopic source, supplemented with limited ancillary source, and (2) those features, present on the original source quadrangle, that can not be reliably photoidentified but that are not considered particularly prone to change.
For Digital Revision Status = Standard Update
This file has undergone standard update digital revision. The data completeness of this file meets NMD standards for feature content.
For Digital Revision Status = Not revised
The Horizontal positional accuracy is based upon the use of USGS source quadrangles which are compiled to meet National Map Accuracy Standards (NMAS). NMAS horizontal accuracy requires that at least 90 percent of points tested are within 0.02 inches of the true position. The digital data are estimated to contain a horizontal positional error of less than or equal to 0.003 inches standard error in the two component directions relative to the source quadrangle. Comparison to the graphic source is used as control to assess digital positional accuracy.
Cartographic offsets may be present on the graphic source, due to scale and legibility constraints. Digital map elements require edge alignment between data sets. Data along each quadrangle edge are tested against the data set for the adjacent quadrangle using PROSYS; tests check for positional accuracy between data sets within a 0.02 inches tolerance. Features with like dimensionality, and with or without like attribution, that are within the tolerance are adjusted by moving the feature equally in both data sets. Features outside the tolerance are not moved. All disconnects are identified by edge matching flags that document the mismatch.
For Digital Revision Status = Limited Update:
This file has undergone limited update digital revision. Accuracy of these digital data meets the class 1 positional accuracy specifications in the draft United States National Cartographic Standards for Spatial Accuracy. Digital map elements require edge alignment between data sets. Data along each quadrangle edge are tested against the data set for the adjacent quadrangle using PROSYS; tests check for positional accuracy between data sets within a 0.02 inches tolerance. Features with like dimensionality, and with or without like attribution, that are within the tolerance are adjusted by moving the feature equally in both data sets. Features outside the tolerance are not moved. All disconnects are identified by edge matching flags that document the mismatch.
For Digital Revision Status = Standard Update:
This file has undergone standard update digital revision. Accuracy of these digital data meets at least the class 2 positional accuracy specification in the draft United States National Cartographic Standards for Spatial Accuracy. Digital map elements require edge alignment between data sets. Data along each quadrangle edge are tested against the data set for the adjacent quadrangle using PROSYS; tests check for positional accuracy between data sets within a 0.02 inches tolerance. Features with like dimensionality, and with or without like attribution, that are within the tolerance are adjusted by moving the feature equally in both data sets. Features outside the tolerance are not moved. All disconnects are identified by edge matching flags that document the mismatch.
For Hypsography, Hydrography and Survey Control and Markers Only: Vertical positional accuracy is based upon the use of USGS source quadrangles which are compiled to meet NMAS. NMAS vertical accuracy requires that at least 90 percent of well defined points tested be within one half contour interval of the correct value. Comparison to the graphic source is used as control to assess digital positional accuracy. For Hypsography, Hydrography and Survey Control and Markers Only: For Digital Revision Status = Limited Update or Standard Update: This file has undergone digital revision. Accuracy of these digital data meets the class 1 positional accuracy specifications in the draft United States National Cartographic Standards for Spatial Accuracy.
U.S. Geological Survey or another mapping agency in cooperation with USGS.
Unknown
The Topographic Map Names Data Base designation for the source quadrangle.
map
Reston, Virginia
U.S. Geological Survey
24000
stable-base material
Unknown
Unknown
ground condition
MAP1
spatial and attribute information
For Digital Revision Status = Not digitally revised:
This Digital Line Graph was digitized from the USGS source quadrangle, by either the National Mapping Division, one of their cooperators, or one of their contractors. The digital data were produced by one of the following methods:
- scanning a stable-based copy of the graphic materials. The scanning process captured the digital data at a scanning resolution of at least 0.001 inches; the resulting raster data were vectorized and then attributed on an interactive editing station.
- scanning the paper map. The scanning process captured the digital data at a scanning resolution of at least 0.001 inches; the resulting raster data were vectorized and then attributed on an interactive editing station.
- scanning a stable-based copy of the graphic materials. The resulting raster data were then manually digitized and attributed on an interactive editing station. The resolution of the digital data is at least 0.001 inches.
- scanning the paper map. The resulting raster data were then manually digitized and attributed on an interactive editing station. The resolution of the digital data is at least 0.001 inches.
- manually digitizing from a stable-based copy of the graphic material using a digitizing table to capture the digital data at a resolution of at least 0.001 inches; attribution was performed either as the data were digitized, or on an interactive edit station after the digitizing was completed.
- manually digitizing from the paper map using a digitizing table to capture the digital data at a resolution of at least 0.001 inches; attribution was performed either as the data were digitized, or on an interactive edit station after the digitizing was completed. The determination of the DLG production method was based on various criteria, including feature density, feature symbology, and availability of production systems. Four control points corresponding to the four corners of the quadrangle were used for registration during data collection. An eight parameter projective transformation was performed on the coordinates used in the data collection and editing systems to register the digital data to the internal coordinates used in PROSYS, and a four parameter linear transformation was performed from the PROSYS internal coordinates to Universal Transverse Mercator (UTM) grid coordinates. The DLG data were checked for position by one or more of the following processes:
- comparing plots of the digital data to the graphic source.
- comparing the digital data to the digital raster scan.
DLG data classification was checked by at least one of the following processes.
- comparing plots of the digital data to the graphic source
- comparing the digital data to the digital raster scan.
Unknown
None
Vector
Universal Transverse Mercator
17
.9996
-81.0
0.0
500000
0.0
coordinate pair
0.61 [0.635 for 1:25,000)
0.61 [0.635 for 1:25,000)
meters
Universal Transverse Mercator
18
.9996
-75.0
0.0
500000
0.0
coordinate pair
0.61 [0.635 for 1:25,000)
0.61 [0.635 for 1:25,000)
meters
North American Datum 1927
Clark 1866
6378206.4
294.98
DLG3 attribute codes are used to describe the physical and cultural characteristics of DLG node, line, and area elements. Attribute codes are used to reduce redundant information, provide enough reference information to support integration with larger data base, and describe the relationships between cartographic elements. Each DLG element has one or more attribute codes composed of a three digit major code and a four-digit minor code. For example, with the 1: 24,000-scale DLG data, the line attribute code 050 0412 has a major code (050), meaning hydrography, with a minor code (0412) meaning stream.
U.S. Department of the Interior, U.S. Geological Survey, 1987, Digital Line Graphs from 1:24,000-Scale Maps--Data Users Guide 1; Reston, Virginia
U.S.Department of the Interior, U.S.Geological Survey, 1990, Standards for Digital Line Graphs, Part 1: General: Reston, VA, 1994
U.S.Department of the Interior, U.S.Geological Survey, 1990, Standards for Digital Line Graphs, Part 2: Specifications: Reston, VA, 1994
U.S.Department of the Interior, U.S.Geological Survey, 1990, Standards for Digital Line Graphs, Part 3: Attribute Codes: Reston, VA, 1994
A hypertext extract is available at:
URL: http://edc.usgs.gov/glis/hyper/guide/usgs_dlg
Softcopies in ASCII, WordPerfect, and PostScript format are available at:
URL: ftp://mapping.usgs.gov/pub/ti/DLG/
Softcopies in ASCII, WordPerfect, and PostScript format are available at:
URL: ftp://mapping.usgs.gov/pub/ti/DLG/
West Virginia State GIS Technical Center
mailing address
425 White Hall POB 6300
Morgantown
West Virginia
26506
1 304 293 5603 ext 4336
WVGIS@wvu.edu
Hypsography, Digital Line Graphs (1:24,000)
The West Virginia GIS Technical Center is committed to offering its users accurate, useful, and current information about the state. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the data collection may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the USGS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
DLG
3
Topological Vector Profile
All available hypsography files can be found at our website data page <URL:http://wvgis.wvu.edu>.
Free when accessed by FTP; incidental charges for media, contact wvgis@wvu.edu for more information
20000316
West Virginia State GIS Technical Center
mailing address
425 White Hall POB 6300
Morgantown
West Virginia
26506
1 304 293 5603 ext 4336
WVGIS@wvu.edu
Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998