Digital line graph (DLG) data are digital representations of cartographic information. DLGs 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 and 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, and (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.
Citation
Title Digital Line Graph - Large Scale
publication Date
2016-12-01
cited responsible party
-
publisher
organisation Name
U.S. Geological Survey (USGS)
Contact information
Address
, Sioux Falls SD 57198 USA
cited responsible party
-
originator
organisation Name
U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center
DLGs 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.
Resource language:
eng; USA
Resource progress code:
underDevelopment
Resource Maintenance Information
maintenance or update frequency:
asNeeded
Constraints on resource usage:
Constraints
Use limitation statement:
Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is
made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty.
Constraints on resource usage:
Legal Constraints
use constraint:
otherRestrictions
Other constraints
Use Constraints: There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal
changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface
conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement
of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is
obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set,
nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html
for the USGS disclaimer.
Constraints on resource usage:
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Access Constraints: Any downloading and use of these data signifies a user's agreement to comprehension and compliance of
the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order
to protect both user and USGS interests.
Constraints on resource usage:
Security Constraints
Classification
unclassified
Classification
System None
Handling
Description None
Spatial representation type code:
vector
Processing environment:
Native Dataset Environment: Oracle Technical Prerequisites: Adequate computer capability is the only technical prerequisite
for viewing data in digital form.
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude
-168.5
eastBoundLongitude
163.1
northBoundLatitude
71.5
southBoundLatitude
5.2
Temporal Extent
point of contact
-
pointOfContact
individual Name custserv@usgs.gov
organisation Name
U.S. Geological Survey Earth Resources Observation and Science (EROS) Center
position Name Long Term Archive (LTA) Representative
Contact information
Telephone
Voice 1-800-ASK-USGS
Address
Long Term Archive (LTA), U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street, Sioux Falls, SD, 57198-0001
Country USA
evaluation Method Description
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: those features that are
photoidentifiable on monoscopic source, supplemented with limited ancillary source, and 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.
Completeness Omission
evaluation Method Description
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: those features that are
photoidentifiable on monoscopic source, supplemented with limited ancillary source, and 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.
ConceptualConsistency
measure Description
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.
organisation Name
U.S. Geological Survey Earth Resources Observation and Science (EROS) Center
position Name Long Term Archive (LTA) Representative
Contact information
Telephone
Voice 1-800-ASK-USGS
Address
Long Term Archive (LTA), U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street, Sioux Falls, SD, 57198-0001
Country USA
fees Typically, all data available from USGS/EROS are downloadable at no cost to the user. There are some cases when a service
fee is required to convert the analog film record to a digital file.
turnaround
A majority of the data are available for immediate downloading. Specific data processing may take 24 to 48 hours and film
scanning service requests involving payment to USGS can require 3 - 4 weeks upon successful payment of the request.
notes: This metadata was automatically generated from the Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998
Version 2) using the 2012-06-20T17:21:00 version of the FGDC RSE to ISO 19115-2 transform.
Metadata contact
-
pointOfContact
individual Name custserv@usgs.gov
organisation Name
U.S. Geological Survey Earth Resources Observation and Science (EROS) Center
position Name Long Term Archive (LTA) Representative
Contact information
Telephone
Voice 1-800-ASK-USGS
Address
Long Term Archive (LTA), U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street, Sioux Falls, SD, 57198-0001
Country USA