U.S. Geological Survey Earth Resources Observation & Science
Center (EROS)
1J067724EBD10421-509572
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. Intermediate-scale
DLG data are derived from USGS 1:100,000-scale 30- by
60-minute quadrangle maps. If these maps are not available,
Bureau of Land Management planimetric maps at a scale of
1:100,000 are used. Intermediate-scale DLGs are sold in five
categories: (1) Public Land Survey System; (2) boundaries;
(3) transportation; (4) hydrography; and (5) hypsography. 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 surface of the Earth, terrain, and political and administrative
units. These data were collected as part of the National Mapping
Program.
--> Surveys
Drainage
--> Land Management
--> Political Divisions
--> Administrative Divisions
--> Political Divisions
--> Surveys
Floods
United States of America
Mexico
North America
WY
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.
None
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was collected and that some parts of these data may no longer represent actual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.
lta@usgs.gov
U.S. Geological Survey Earth Resources Observation
and Science (EROS) Center
Long Term Archive (LTA) Representative
mailing and physical 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
USA
lta@usgs.gov
0800 - 1600 CT, M-F, -6 h GMT
lta@usgs.gov
none
unclassified
none
Oracle
The identification of features is provided by the
distinct electromagnetic energy it emits,reflects, or otherwise transmits. This is
called the spectral signature. Other signatures such as tone (lightness or
darkness), texture (surface roughness or smoothness), pattern,shadow, shape, and
size
are as important. Thus, through the use of the thematic mapper sensor, such
elements
as water features, soils, and vegetation can be identified and distinguished from
each other.
begin and end at
nodes; (2) lines must connect to each other at nodes; (3) lines do not
extend through nodes; (4) left and right areas are defined for each
line element and are consistent throughout the file; (5) and the lines
representing the limits of the file (neatline) are free of gaps.
The tests of logical consistency areperformed 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 are ignored and all data
crossing these geographically straight lines is clipped at the
neatline. Neatline straightening aligns the digitized edges of
the digital data with the generated neatline or the
longitude/latitude lines in geographic coordinates. All internal
areas are tested for closure using PROSYS.
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 a 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
cannot 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 Digital Revision Status = Not revised:
cooperation with USGS.
Reston, Virginia
Source_Scale_Denominator 100000
Type_of_Source_Media stable-base material
Source_Time_Period_of_Content Time_Period_Information
Source_Currentness_Reference 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:
(1) Scan a stable-based copy of the graphic materials. The
scanning process captured the digital data at a scanning
resolution of at least 0.0001 inches; the resulting raster data
were vectorized and then attributed on an interactive editing
station.
(2) Scan 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.
(3) Scan 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.
(4) Manually digitize 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.
unknown
lta@usgs.gov
Contact_Position Long Term Archive (LTA) Representative
Contact_Address
Long Term Archive (LTA), U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
lta@usgs.gov
lta@usgs.gov
The determination of the DLG production method was based
on various criteria, including feature density, feature symbology,
and the 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: (1) Compare
plots of the digital data to the graphic source, (2) Compare the
digital data to the digital raster scan.
DLG data classification was checked by at least one of the
following processes: (3) Compare plots of the digital data to the
graphic source, (4) Compare the digital data to the digital raster
scan.
unknown
lta@usgs.gov
Contact_Position Long Term Archive (LTA) Representative
Contact_Address
Long Term Archive (LTA), U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
lta@usgs.gov
lta@usgs.gov
vector
1
12
.09996
-123 00 00
0.0
500000
Planar_Coordinate_Information Planar_Coordinate_Encoding_Method
2.54
Planar_Distance_Units 2.54
unknown
Clark 1866
6378206.4
294.98
National Geodetic Vertical Datum of 1929
1
feet or meters
attribute values
Mean lower low water
1
feet or meters
attribute values
DLG3 attribute codes are used to describe the
physical and
cultural characteristics of DLG node, line, and area elements.
codes are used to reduce redundant information,
provide enough reference information to support integration with
larger data base, and describe the relationships between different
cartographic elements. Each DLG element has one or more
codes composed of a three-digit major code and a
four-digit minor code.
Geological Survey, 1987
Digital Line Graphs from 1:100,000-Scale Maps -- Data Users
Guide 2; Reston, Virginia.
U.S. Department of the Interior, U.S. Geological Survey, 1990,
Standards for Digital Line Graphs; Reston, Virginia
Softcopies of the DLG Standards, including both DLG-3 and DLG-F
series, are available in PDF format at:
http://mapping.usgs.gov/standards/index.html
Contact_Organization_Primary
U.S. Geological Survey Earth Resources Observation and Science
(EROS) Center
Contact_Position Long Term Archive (LTA) Representative
Contact_Address Address_Type
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls
SD
57198-0001
USA
lta@usgs.gov
0800 - 1600 CT, M-F, -6 h GMT
lta@usgs.gov
1:100,000-scale digital line graphs
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.
SDTS
199207
Digital_Transfer_Option
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.
to the user. there are some cases when a service fee is required to convert the
analog film record to a digital file. This non-refundable fee is $30 per scene/frame.
information.
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.
prerequisite for viewing data in digital form. You may return here at any time and
add to your data request before final submission.
Metadata_Review_Date as needed
lta@usgs.gov
LTA, U.S. Geological Survey Earth Resources
Observation and Science (EROS) Center
Long Term Archive (LTA) Representative
mailing and physical 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
USA
lta@usgs.gov
0800 - 1600 CT, M-F, -6 h GMT
lta@usgs.gov
Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998 Version 2
local time
None
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.
None
Unclassified
None