1:24,000-scale Digital Line Graphs

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Metadata:

Identification_Information:

Citation:

Citation_Information:

Originator:

U.S. Geological Survey or another mapping agency in
cooperation with USGS.
Publication_Date: Unknown

Title: 1:24,000-scale Digital Line Graphs

Publication_Information:

Publication_Place: Reston, Virginia

Publisher: U.S. Geological Survey

Description:

Abstract:

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.
Purpose:

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.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19800705

Ending_Date: present

Currentness_Reference: publication date

Status:

Progress: In work

Maintenance_and_Update_Frequency: Irregular

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -124.7333

East_Bounding_Coordinate: -067.9500

North_Bounding_Coordinate: 49.3833

South_Bounding_Coordinate: 24.5333

Keywords:

Theme:

Theme_Keyword_Thesaurus: None.

Theme_Keyword: digital line graph

Theme_Keyword: DLG

Theme_Keyword: hydrography

Theme_Keyword: transportation

Theme_Keyword: boundaries

Theme_Keyword: U.S. Public Land Survey System

Theme_Keyword: hypsography

Theme_Keyword: manmade features

Theme_Keyword: survey control and markers

Theme_Keyword: non-vegetative features

Theme_Keyword: vegetative surface cover

Place:

Place_Keyword_Thesaurus:

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.
Place_Keyword: US

Place_Keyword: CA

Place_Keyword: MX

Place:
Place_Keyword_Thesaurus:

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.
Place_Keyword: FIPS codes for states covered

Access_Constraints: None

Use_Constraints:

None. Acknowledgement of the U.S. Geological Survey would
be appreciated in products derived from these data.
Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: Unknown

Logical_Consistency_Report:

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.
Completeness_Report:

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.
Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: For Digital Revision Status = Not revised:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

For Hypsography, Hydrography and Survey Control and
Markers Only:
For Digital Revision Status = Not revised:
Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:

U.S. Geological Survey or another mapping agency in
cooperation with USGS.
Publication_Date: Unknown

Title:

The Topographic Map Names Data Base designation for
the source quadrangle.
Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: Reston, Virginia

Publisher: U.S. Geological Survey

Source_Scale_Denominator: 24000

Type_of_Source_Media: stable-base material

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: Unknown

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: MAP1

Source_Contribution: spatial and attribute information

Source_Information:

Source_Citation:

Citation_Information:

Originator:

U.S. Geological Survey or another mapping agency in
cooperation with USGS.
Publication_Date: Unknown

Title:

The Topographic Map Names Data Base designation
for the DOQ
Geospatial_Data_Presentation_Form: remote-sensing image

Publication_Information:

Publication_Place: Reston, Virginia

Publisher: U.S. Geological Survey

Source_Scale_Denominator: 12000

Type_of_Source_Media: magnetic tape

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: Unknown

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: DOQ1

Source_Contribution:

Provides locational and attribute information for
photoidentifiable features during revision.
Source_Information:

Source_Citation:

Citation_Information:

Originator:

U.S. Geological Survey or another mapping agency in
cooperation with USGS.
Publication_Date: Unknown

Title:

The Topographic Map Names Data Base designation
for the DOQ
Geospatial_Data_Presentation_Form: remote-sensing image

Publication_Information:

Publication_Place: Reston, Virginia

Publisher: U.S. Geological Survey

Source_Scale_Denominator: 12000

Type_of_Source_Media: magnetic tape

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: Unknown

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: DOQ2

Source_Contribution:

Provides locational and attribute information for
photoidentifiable features during revision.
Source_Information:

Source_Citation:

Citation_Information:

Originator:

U.S. Geological Survey or another mapping agency in
cooperation with USGS.
Publication_Date: Unknown

Title:

The Topographic Map Names Data Base designation
for the DOQ
Geospatial_Data_Presentation_Form: remote-sensing image

Publication_Information:

Publication_Place: Reston, Virginia

Publisher: U.S. Geological Survey

Source_Scale_Denominator: 12000

Type_of_Source_Media: magnetic tape

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: Unknown

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: DOQ3

Source_Contribution:

Provides locational and attribute information for
photoidentifiable features during revision.
Source_Information:

Source_Citation:

Citation_Information:

Originator:

U.S. Geological Survey or another mapping agency in
cooperation with USGS.
Publication_Date: Unknown

Title:

The Topographic Map Names Data Base designation
for the DOQ
Geospatial_Data_Presentation_Form: remote-sensing image

Publication_Information:


Publication_Place: Reston, Virginia


Publisher: U.S. Geological Survey


Source_Scale_Denominator: 12000

Type_of_Source_Media: magnetic tape

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: Unknown

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: DOQ4


Source_Contribution:

Provides locational and attribute information for
photoidentifiable features during revision.

Process_Step:

Process_Description:

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.
Source_Used_Citation_Abbreviation: MAP1

Process_Date: Unknown

Process_Step:

Process_Description:

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.
Source_Used_Citation_Abbreviation: DOQ1, DOQ2, DOQ3, DOQ4

Process_Date: Unknown

Process_Step:

Process_Description:

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.
Source_Used_Citation_Abbreviation: DOQ1, DOQ2, DOQ3, DOQ4

Process_Date: Unknown

Spatial_Data_Organization_Information:


Indirect_Spatial_Reference:


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.
Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 10-19

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: .9996

Longitude_of_Central_Meridian: -123 00 00

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.61 [0.635 for 1:25,000]

Ordinate_Resolution: 0.61 [0.635 for 1:25,000]

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum 1927

Ellipsoid_Name: Clark 1866

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: National Geodetic Vertical Datum of 1929

Altitude_Resolution: 1

Altitude_Distance_Units: feet or meters

Altitude_Encoding_Method: attribute values

Depth_System_Definition:

Depth_Datum_Name: Mean lower low water

Depth_Resolution: 1

Depth_Distance_Units: meters or feet

Depth_Encoding_Method: attribute values

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

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.
Entity_and_Attribute_Detail_Citation:

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:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Earth Science Information Center, U.S.Geological Survey

Contact_Address:

Address_Type: mailing address

Address: 507 National Center

City: Reston

State_or_Province: Virginia

Postal_Code: 20192

Contact_Voice_Telephone: 1-888-ASK-USGS

Hours_of_Service: 0800-1600

Contact_Instructions:

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>
Resource_Description: 1:24,000-scale digital line graphs

Distribution_Liability:

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.
Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: SDTS

Format_Version_Date: 199207

Format_Specification: Topological Vector Profile

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:
URL: <http://edc.usgs.gov/doc/edchome/ndcdb/dlg_large/states.html>

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: URL: <ftp://edcftp.cr.usgs.gov/pub/data/DLG_LARGE/>

Offline_Option:

Offline_Media: CD-ROM

Recording_Format: ISO 9660

Compatibility_Information:

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.
Digital_Form:

Digital_Transfer_Information:

Format_Name: DLG

Format_Version_Date: 198805

Format_Specification: Optional

Digital_Transfer_Option:

Offline_Option:

Offline_Media: CD-ROM

Recording_Format: ISO 9660

Compatibility_Information:

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.
Offline_Option:

Offline_Media: Cartridge

Recording_Capacity:

Recording_Density: 3480

Recording_Density_Units: megabytes

Recording_Format:

ASCII; available unlabelled or with ANSI- standard labels; available
block sizes are multiples of 144 characters ranging from 8064 to 32720
characters.
Offline_Option:

Offline_Media: Cassette

Recording_Capacity:

Recording_Density: 8-mm High (4.5Gb)

Recording_Density_Units: gigabytes

Recording_Format:

ASCII; available unlabelled or with ANSI- standard labels; available
block sizes are multiples of 144 characters ranging from 8064 to 32720
characters.
Offline_Option:

Offline_Media: Cassette

Recording_Capacity:

Recording_Density: 8-mm Low (2.3Gb)

Recording_Density_Units: gigabytes

Recording_Format:

ASCII; available unlabelled or with ANSI- standard labels; available
block sizes are multiples of 144 characters ranging from 8064 to 32720
characters.
Fees:

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>
Ordering_Instructions:

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>
Metadata: Reference Information
Metadata_Reference_Information:

Metadata_Date: 199001

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing address

Address: 508 National Center

City: Reston

State_or_Province: Virginia

Postal_Code: 20192

Contact_Voice_Telephone: 1 703 648 4543

Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Security_Information:

Metadata_Security_Classification_System: None

Metadata_Security_Classification: Unclassified

Metadata_Security_Handling_Description: None
Generated by mp version 2.9.14 on Fri Oct 7 07:08:49 2011