[Keyword='Cities']
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Digital Raster Graphics
Entry ID:
drg
Summary
Abstract:
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 ...  Purpose: The DRG is used for validating digital line graphs (DLGs) 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 DRGs and DOQs for revising and collecting digital data, DRGs and DEMs for creating shaded-relief DRGs and ...
Related URL
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
Data Set Citation
Dataset Originator/Creator:
U.S. Geological Survey (USGS) EROS Center
Dataset Title:
Digital Raster Graphics
Dataset Release Place:
Sioux Falls, South Dakota, USA
Dataset Publisher:
U.S. Geological Survey EROS Center
Data Presentation Form:
Maps
Other Citation Details:
For additional information, contact any USGS Earth Science Information Center (ESIC), or call 1-888-ASK-USGS.
Online Resource:
http://earthexplorer.usgs.gov
Science Keywords
ISO Topic Category
Quality
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 screen 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.
Access Constraints
None
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be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions.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.
Ancillary Keywords
Data Set Progress
COMPLETE
Originating Center
Data Center
Distribution
Distribution Media:
Digital Download
Distribution Size:
The average file size is 10 megabytes.
Distribution Format:
TIFF/GeoTIFF
Fees:
Free
Personnel
Role:
TECHNICAL CONTACT
Phone:
605-594-6151
Phone:
800-252-4547
Fax:
605-594-6589
Email:
lta at usgs.gov
Contact Address:
LTA Customer Services
U.S. Geological Survey
EROS Center
47914 252nd Street
City:
Sioux Falls
Province or State:
SD
Postal Code:
57198-0001
Country:
USA
Extended Metadata Properties
(Click to view more)
Creation and Review Dates
Last DIF Revision Date:
2013-05-02
Future DIF Review Date:
2002-08-01
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