eng
utf8
dataset
U.S. Geological Survey EROS Data Center
Customer Services Representative
(605) 594-6151
(605) 594-658
Customer Services U.S. Geological Survey EROS Data Center
Sioux Falls
SD
57198-0001
USA
custserv@edcmail.cr.usgs.gov
0700 - 1615 CST
pointOfContact
19970904
ISO 19115
2003
http://edc.usgs.gov/
Digital Raster Graphics (DRGs)
1996
publication
1.0
DRG CD-R
U.S. Geological Survey EROS Data Center
originator
mapDigital
USGS Digital Raster Graphics
Digital Raster Graphics (DRGs) are scanned color images of USGS
topographic maps.
Earth Science Information Centers (ESIC) offer nationwide information
and sales service for USGS map products and earth science publications.
For additional information, contact any USGS Earth Science Information
Center (ESIC), or call 1-888-ASK-USGS.
A digital raster graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. The scanned image includes all map collar information. The image inside the map neatline is georeferenced to the surface of the Earth. The DRG can be used to collect, review, and revise other digital data, especially digital line graphs (DLG). When the DRG is combined with other digital products, such as digital orthophoto quadrangles (DOQ) or digital elevation models (DEM), the resulting image provides additional visual information for the extract- ion and revision of base cartographic information. The USGS is producing DRG's of the 1:24,000-,1:24,000/1:25,000-, 1:63,360- (Alaska), 1:100,000-, and 1:250,000-scale topographic map series.
The DRG is used for validating digital line graphs (DLG's) and for DLG data collection and revision. The DRG can help assess the completeness of digital data from other mapping agencies. It can also be used to produce "hybrid" products. These include combined DRG's and DOQ's for revising and collecting digital data, DRG's and DEM's for creating shaded-relief DRG's, and combinations of DRG, DOQ, and DLG data. Although a standard DRG is an effective mapping tool, its full potential for digital production is realized in combination with other digital data
U.S. Geological Survey EROS Data Center
Customer Services Representative
(605) 594-6151
(605) 594-6589
U.S. Geological Survey EROS Data Center
Sioux Falls
SD
57198-0001
USA
custserv@edcmail.cr.usgs.gov
0730 - 1615 CST
URL: http://edc.usgs.gov/eros-home.html
pointOfContact
asNeeded
Digital Raster Graphic
Dover, Delaware
JPEG
digital elevation model
DEM
digital terrain model
contour line
digital contours
DOQ
digital orthophoto
digital orthophotoquad
digital image map
aerial photograph
paper map
map
digital line graph
U.S. Public Land Survey System
hydrography
transportation
hydrography
topographic
Universal Transverse Mercator (UTM)
scanner
raster
digital image
theme
None
US
United States
FIPS codes for states covered
Puerto Rico
place
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.
true ground conditions
temporal
None
otherRestrictions
otherRestrictions
Access Constraints: None Use Constraints: Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Distribution Liability: 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. The USGS 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 days from the date of this shipment from the ordering site.
unclassified
None
None
eng
Native Dataset Environment: Unix Technical Prerequisites: Adobe Acrobat Reader 2., CD-ROM drive
-124.7333
-67.95
24.5333
49.3833
ground condition
1996
Present
Digital raster graphic (DRG) data on CD-ROM are being produced
by the U.S. Geological Survey (USGS) through an Innovative Partnership
agreement with The Land Information Technology Company, Ltd., of
Aurora, CO. This series includes DRG's of USGS standard series
quadrangle maps of the United States, its Trusts, and Territories.
To facilitate file manipulation by the widest possible range of potential users, data and text files on the CD-ROM conform to the DOS "eight plus three" (8.3) file naming convention. The associated DRG image (.TIF), world (.TFW), and metadata (.FGD) files incorporate an intelligent data set name (DSN) consisting of descriptive metadata wrapped around a standardized kernel that describes the spatial location of the file. The intent of this file naming protocol is to positively identify the spatial identity of the file and describe its categoric identity. The DSN is designed to geographically locate DRG's of quadrangles using the 7.5-minute grid, clearly identifying those that fall exactly on the grid. DRG's that are not aligned with the 7.5-minute grid can be named with this convention but additional consideration is required to relate these undersize, oversize, or offset quadrangles to their most logical and unique 7.5-minute grid location.
false
Entity and Attribute Overview: Each raster entity or pixel contains a digital number from 0 through 12 referencing a color palette of RGB values from 0 through 255 in which the standard colors used in the DRG are defined. Entity and Attribute Detail Citation: Standards for Digital Raster Graphic.
Tagged Image File Format (TIFF)
version 6.0
Download WinCATS USGS DRG and DLG-O & DRG viewing software available from USGS.
PackBits
Customer Services
U.S. Geological Survey EROS Data Center
Customer Services Representative
605-594-6151
605-594-6589
Customer Services U.S. Geological Survey EROS Data Center
Sioux Falls
SD
57198
USA
custserv@edcmail.cr.usgs.gov
7:30 am to 4:00 pm CT
Automated Ordering. Your order is forwarded to Customer Services at the U.S.
Geological Survey's EROS Data Center. A Customer Services Representative
contacts you to discuss your order and your mode of payment.
Manual Ordering. Write down the ordering ID(s) for your item(s). Contact
Customer Services between the hours of 8:00 a.m. and 4:00 p.m. CST.
distributor
The current costs are available at: URL: http://edc.usgs.gov/glis/hyper/order_info/prices#DRG_CD DRG File size may necessitate distribution on multiple CD-ROMs
1997
Ordering Instructions: Dataset searching and ordering capabilities are available through the Global Land Information System (GLIS) at: URL: http://edc.usgs.gov/webglis
ASAP
NaN
cdRom
650
megabytes
iso9660
None
Horizontal Positional Accuracy
DRG's will retain the horizontal accuracy of the source maps. Most
USGS printed maps contain the National Map Accuracy Standards (NMAS)
note in the collar area. The NMAS states that for maps on
publication scales of 1:20,000 or smaller, not more than 10 percent
of the points tested shall be in error by more than 1/50 inch
measured on the publication scale. Test points must be "well-defined",
that is, easily visible or recoverable on the ground. For
DRG's this accuracy statement applies only to that area of the DRG
that falls within the neatline of the source map (excluding inset
areas). Overedge areas falling outside the transformation boundary
area (the map neatline), can exhibit anomalies or discrepancies.
These anomalies also will appear in the map inset areas and in the
map collar. For maps without the NMAS note, the horizontal accuracy
is unknown. However, the DRG will retain the accuracy of the source
map.
A random sampling of DRG's will be accuracy tested. The accuracy
test will be performed by comparing the positions of UTM grid
intersections on the source graphic against the corresponding
location on the digital image. A visual inspection will determine
whether those coordinates fall within the pixels that define a grid
tick. DRG's duplicate the horizontal accuracy of its source.
0
Vertical Positional Accuracy
In the DRG the vertical positional accuracy is referenced in the DRG
collar.
Image completeness is checked by visually inspecting a sampling of
DRG's. Each selected DRG will be examined for gaps (missing data)
in the main body of the map, the map collar, the overedge areas, and
any insets
Image completeness is checked by visually inspecting a sampling of
DRG's. Each selected DRG will be examined for gaps (missing data)
in the main body of the map, the map collar, the overedge areas, and
any insets
The USGS DRG is produced with the intention of replicating as close
as possible the original source map. Users of the DRG will note,
however, that a certain amount of "noise" can be discerned when
small areas are blown up or viewed under zoomed-in conditions. This
noise is in the form of random specks or pixels of color and halos
due to any number of factors, such as, the quality of the source,
the use of screens and patterns on the litho, and the unevenness of
ink due to saturation and absorption. Discontinuities or breaks in
linear features may also be present and are due to improper
calibration or usage of the scanner, the condition of the source,
and resampling. Descreening, quantizing, and noise filtering are
methods used to reduce noise, which, besides creating a more
aesthetically pleasing image, have the added benefit of reducing the
size of the image file. Removal of lithographic screen patterns is
preferred but not required.
Quantitative Attribute Accuracy Assessment
DRG's are examined to ensure color consistency within a series.
Inspections are performed on selected DRG's to ensure that both the
order of digital numbers (see table 2-2) and digital number values
are correct. Colors will be checked for color compliance to map
series and for major color differences between features on the DRG
and similar features on the source map. Color consistency
throughout each series is checked by comparing a DRG to its
neighboring quadrangles whenever possible.
The DRG uses a standard palette to ensure uniform color
throughout a particular map series. The RGB values for a particular
color, therefore, will remain consistent throughout that DRG series.
Although the color values of the DRG may sometimes match those
of the paper source map, a user will usually notice small differences
between the colors on the digital image and on the paper map. Also,
the quality of the user's monitor affects the DRG color displayed.
Although the DRG generally contains the complete content of the
source map, features may occasionally be blurred because of
substandard source materials. The DRG also may contain
misclassified pixels (color noise).
The DRG is an 8-bit color image that employs a color palette to ensure
uniform colors throughout a particular DRG series. All DRG's within
a series must have the same RGB value.
00
Production of a DRG begins with the scanning of a paper 7.5-minute
topographic map (map1) on a high-resolution scanner. Scanning
resolutions range from 500-1,000 dpi with an output file of
160-300 Mb in size. Removal of screens (descreening) and color
quantization to reduce the number of colors also takes place during
the scanning phase.
The raw scan file is then transformed and georeferenced using UTM
coordinates of the sixteen 2.5-minute grid ticks, which are obtained
using the in-house produced program COORDAT and stored in a ground
control file. Those sixteen 2.5-minute ticks are interactively
visited and assigned their respective UTM coordinates. The USGS
program XSHAPES4 then performs a piecewise linear rubber sheet
transformation.
An output resolution of 2.4 meters (8.2 feet) is chosen to resample
the file to 250 dpi. The image file is converted to a TIFF 6.0
image and further reduced by converting the file to a run length
encoded PackBits compression (type 32773).
The color palette of the compressed DRG is then standardized by
replacing the original RGB values assigned during the scanning
process with standard RGB value combinations using the in-house
produced TIFFREMAP program.
Rolla-ESIC
U.S. Geological Survey
Customer Services Representative
573-308-3577
573-308-3652
1400 Independence Rd., MS231
Rolla
MO
65401-2602
USA
esic@mcmcmail.er.usgs.gov
URL: http://mcmcweb.er.usgs.gov/drg/
processor
map1
Source Contribution:
The standard area of coverage of a DRG is the entire area printed
on a USGS standard series topographic map including the map collar,
any overedge areas, and insets. These standard series maps include:
7.5-minute map series: Conterminous United States, Hawaii, and
limited areas of Alaska at 1:24,000 and 1:25,000 scale.
7.5- by 15-minute map series: Covers limited areas of the
conterminous United States at 1:25,000 scale.
30- by 60-minute map series: Conterminous United States
paper
USGS Topographic maps
USGS Topo
0000
publication
U.S. Geological Survey
resourceProvider
mapDigital
The source for DRG's are the standard quadrangle format USGS
topographic maps as described in the Federal Geographic Data
Committee "Manual of Federal Geographic Data Products." They
include 1:20,000-, 1:24,000-, 1:25,000-, 1:30,000-, 1:63,360-,
1:100,000- and 1:250,000-scale topographic maps. Included in the
1:24,000- and 1:25,000-scale series are provisional (P) maps and
color orthophotomaps.
ground condition
Metadata Access Constraints: None Metadata Use Constraints: None
None
None
19971230
This metadata was automatically generated from the Content Standard for Digital Geospatial Metadatastandard version FGDC-STD-001-1998.
U.S. Geological Survey EROS Data Center
Customer Services Representative
(605) 594-6151
(605) 594-658
Customer Services U.S. Geological Survey EROS Data Center
Sioux Falls
SD
57198-0001
USA
custserv@edcmail.cr.usgs.gov
0700 - 1615 CST
custodian