U.S. Geological Survey or another mapping agency in cooperation with USGS. Unknown Reston, Virginia U.S. Geological Survey 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 derived from USGS 1: 20,000-, 1: 24,000-, and 1: 25,000-scale 7.5-minute topographic quadrangle maps. Large-scale DLG data are available in nine categories: (1) hypsography, (2) hydrography, (3) vegetative surface cover, (4) non-vegetative features, (5) boundaries, (6) survey control and markers, (7) transportation, (8) manmade features, (9) Public Land Survey System. 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. 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. 19800705 present publication date In work Irregular -124.7333 -067.9500 49.3833 24.5333 None. digital line graph DLG hydrography transportation boundaries U.S. Public Land Survey System hypsography manmade features survey control and markers non-vegetative features vegetative surface cover 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 CA MX 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. FIPS codes for states covered None None. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Data Quality Information Unknown 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. For Digital Revision Status = Not revised 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: For Hypsography, Hydrography and Survey Control and Markers Only: For Digital Revision Status = Not revised: U.S. Geological Survey or another mapping agency in cooperation with USGS. Unknown map Reston, Virginia U.S. Geological Survey 24000 stable-base material Unknown ground condition MAP1 spatial and attribute information U.S. Geological Survey or another mapping agency in cooperation with USGS. Unknown remote-sensing image Reston, Virginia U.S. Geological Survey 12000 magnetic tape Unknown ground condition DOQ1 Provides locational and attribute information for photoidentifiable features during revision. U.S. Geological Survey or another mapping agency in cooperation with USGS. Unknown remote-sensing image Reston, Virginia U.S. Geological Survey 12000 magnetic tape Unknown ground condition DOQ2 Provides locational and attribute information for photoidentifiable features during revision. U.S. Geological Survey or another mapping agency in cooperation with USGS. Unknown remote-sensing image Reston, Virginia U.S. Geological Survey 12000 magnetic tape Unknown ground condition DOQ3 Provides locational and attribute information for photoidentifiable features during revision. U.S. Geological Survey or another mapping agency in cooperation with USGS. Unknown remote-sensing image Reston, Virginia U.S. Geological Survey 12000 magnetic tape Unknown ground condition DOQ4 Provides locational and attribute information for photoidentifiable features during revision. 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. MAP1 Unknown For Digital Revision Status = Limited Update This file has undergone limited update digital revision. Limited update revision uses monoscopic imagery and limited ancillary source, with no field verification. DOQ1, DOQ2, DOQ3, DOQ4 Unknown For Digital Revision Status = Standard Update This file has undergone standard update digital revision. Standard update revision uses stereoscopic imagery as needed, in addition to monoscopic imagery, with field verification. DOQ1, DOQ2, DOQ3, DOQ4 Unknown Spatial Data Organization Information For Public Land Survey System: U.S. Department of the Interior, Bureau of Land Management: U.S. Public Land Survey System For Boundaries: 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. 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. U.S. Department of Commerce,1990, Counties and equivalent entities of The United States, its possessions, and associated areas (Federal Information Processing Standard 6-4): Washington, D.C. National Institute of Standards and Technology. For Survey Control and Markers: 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. U.S. Department of Commerce,1990, Counties and equivalent entities of The United States, its possessions, and associated areas (Federal Information Processing Standard 6-4): Washington, D.C. National Institute of Standards and Technology. Vector Spatial Reference Information Universal Transverse Mercator 10-19 .9996 -123 00 00 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 National Geodetic Vertical Datum of 1929 1 feet or meters attribute values Mean lower low water 1 meters or feet attribute values Entity and Attribute Information 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 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/ U.S.Department of the Interior, U.S.Geological Survey, 1990, Standards for Digital Line Graphs, Reston, VA, 1994 Softcopies in ASCII, WordPerfect, and PostScript format are available at: URL: ftp://mapping.usgs.gov/pub/ti/DLG/ Distribution Information Earth Science Information Center, U.S.Geological Survey mailing address

507 National Center

Reston Virginia 20192 1-888-ASK-USGS 0800-1600 In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at: URL:http://mapping.usgs.gov/esic/esic_index.html 1:24,000-scale digital line graphs 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. The Geological Survey will warrant the delivery of this product in computer-readable format, and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer input peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustment of credit must be made within 90 day from the date of this shipment from the ordering site. SDTS 199207 Topological Vector Profile URL: http://edc.usgs.gov/doc/edchome/ndcdb/dlg_large/states.html URL: ftp://edcftp.cr.usgs.gov/pub/data/DLG_LARGE/ CD-ROM ISO 9660 This CD-ROM can be used with all computer operating systems that support CD-ROM as a logical storage device. All text files on the disc are in ASCII format. Data files are in ASCII or binary format. DLG 198805 Optional CD-ROM ISO 9660 This CD-ROM can be used with all computer operating systems that support CD-ROM as a logical storage device. All text files on the disc are in ASCII format. Data files are in ASCII or binary format. Cartridge 3480 megabytes ASCII; available unlabelled or with ANSI- standard labels; available block sizes are multiples of 144 characters ranging from 8064 to 32720 characters. Cassette 8-mm High (4.5Gb) gigabytes ASCII; available unlabelled or with ANSI- standard labels; available block sizes are multiples of 144 characters ranging from 8064 to 32720 characters. Cassette 8-mm Low (2.3Gb) gigabytes ASCII; available unlabelled or with ANSI- standard labels; available block sizes are multiples of 144 characters ranging from 8064 to 32720 characters. The online copy of the data set (when available electronically) may be accessed without charge. For cartridge, cassette, and CD-ROM the costs are available at: URL: http://edc.usgs.gov/glis/hyper/order_info/prices#DLG_LARGE All nonstandard quadrangles with neatlines that extend beyond the standard unit size to accommodate overedge boundaries are collected as multiples of the standard unit size. Data covering a 7.5- by 8.5- minute quadrangle area would be sold as two 7.5-minute units. Each 7.5-minute unit is distributed as 1 7.5-minute cell, except in high-density areas, where the 7.5-minute cells may be divided into 2 or more cells. The transportation category of data includes major transportation systems collected in three separate overlays labeled: (1) Roads and Trails, (2) Railroads, and (3) Pipelines, Transmission Lines, and Miscellaneous Transportation Features. Although collected separately, the three files are distributed as a single unit. Orders for the transportation category for a given area will include all three files. Dataset searching and ordering capabilities are available through the Global Land Information System (GLIS) at: URL: http://edc.usgs.gov/webglis Reference Information 199001 U.S. Geological Survey mailing address

508 National Center

Reston Virginia 20192 1 703 648 4543 Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 None Unclassified None