Charleston 1:24000 Quadrangle, U.S.G.S. Digital Raster Graphic 43124c3

Citation:

Citation Information:

Originator: U.S. Geological Survey: Eros Data Center
Publication Date: 1996
Title: Charleston 1:24000 Quadrangle, U.S.G.S. Digital Raster Graphic 43124c3
Edition: 1.0
Geospatial Data Presentation Form: Map
Publication Information:

Publication Place: Sioux Falls
Publisher: U.S. Geological Survey: Eros Data Center

Other Citation Details:
Earth Science Information Centers (E.S.I.C.) offer nationwide information and sales service for U.S.G.S. map
products and earth science publications. For additional
information, contact any U.S.G.S. Earth Science Information
Center (E.S.I.C.) , or call 1-800-USA-MAPS.

Online Linkage: http://edcwww.cr.usgs.gov/

Description:

Abstract:
A digital raster graphic (D.R.G.) is a scanned image of a U.S. Geological survey (U.S.G.S.) topographic map. The
scanned image includes all map collar information. The
image inside the map neatline is georeferenced ot the
surface of the earth. The D.R.G. can be used to collect,
review and revise other digital data, especially line
graphs (D.L.G.). When the D.R.G. is combined with other
digital products, such as digital orthophoto quadrangles
(D.O.Q.) or digital elevation models (D.E.M.), the
resulting image provides additional visual information for
the extraction and revision of base cartographic
information. The U.S.G.S. is producing D.R.Gs. 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's in the Oregon Coastal Atlas have been cropped and
Re-projected by the OGDC into the OGIC projection.

Purpose:
The D.R.G. is used for validating digital line graphs (D.L.Gs.) and for D.L.G. data collection and revision. The
D.R.G. can help assess the completeness of digital data
from other mapping agencies. It can also be used to produce
'""hybrid"" products. These include combined D.R.Gs. and
D.O.Qs. for revising and collecting digital data, D.R.Gs.
and D.E.Ms. for making shaded-relief D.R.Gs., and
combinations of D.R.G., D.O.Q. and D.L.G. data. Although a
standard D.R.G. is an effective mapping tool, its full
potential for digital production is realized in combination
with other digital data.

Supplemental Information:
Digital Raster Graphic (D.R.G.) data on C.D.-R.O.M. are being produced by the U.S. Geological Survey (U.S.G.S.)
through an Innovative Partnership agreement with The Land
Information Technology company, Ltd., of Aurora, CO. This
series includes D.R.Gs. of U.S.G.S. standard series
quadrangle maps of the United States, its Trusts and Territories.

Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 1996
Beginning Time: Unknown
Ending Date: Present
Ending Time: Unknown

Currentness Reference: ground condition

Status:

Progress: In work
Maintenance and Update Frequency: As needed

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -124.375
East Bounding Coordinate: -124.25
North Bounding Coordinate: 43.375
South Bounding Coordinate: 43.25

Keywords:

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: contour line
Theme Keyword: digital image
Theme Keyword: digital image map
Theme Keyword: digital line graph
Theme Keyword: paper map
Theme Keyword: raster
Theme Keyword: scanner
Theme Keyword: topographic
Theme Keyword: transportation
Theme Keyword: U.S. Public Land Survey System

Place:

Place Keyword Thesaurus: None
Place Keyword: Charleston
Place Keyword: Oregon
Place Keyword: U.S.
Place Keyword: United States
Place Keyword: US

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

Point of Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: U.S. Geological Survey: E.R.O.S. Data Center

Contact Position: Customer Services Representative
Contact Address:

Address Type: mailing and physical address
Address: E.R.O.S. Data Center
City: Sioux Falls
State or Province: S.D.
Postal Code: 57198-0001
Country: U.S.A.

Contact Voice Telephone: (605) 594-6151
Contact Facsimile Telephone: (605) 594-6589
Contact Electronic Mail Address: custserv@edcmail.cr.usgs.gov
Hours of Service: 7:30 - 16:15 C.S.T.

Native Data Set Environment: ArcInfo/ArcView

Attribute Accuracy:

Attribute Accuracy Report:
The D.R.G. uses a standard palette to ensure uniform color throughout a particular map series. The R.G.B. values for a
particular color, therefore, will remain consistent
throughout that D.R.G. series. Although the color values of
the D.R.G. 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 D.R.G. color
displayed. Although the D.R.G. generally contains the
complete content of the source map, features may
occasionally be blurred because of substandard source
materials. The D.R.G. also may contain misclassified pixels
(""color noise""). The D.R.G. is an 8-bit color image that employs
a color palette to ensure uniform colors throughout a particular
D.R.G. series. All D.R.Gs. within a series must have the same
R.G.B. value.

Logical Consistency Report:
The U.S.G.S. Digital Raster Graphic is produced with the intention of replicating, as close as possible, the
original source map. Users of the D.R.G. will note,
however, that a certain amount of ""noise"" can be discerned
when small areas are enlarged or viewed under zoomed-in
conditions. This noise is in the form of random specks or
pixels of color and halos, caused by any number of factors,
such as the quality of the source; the use of of screens
and paterns on the lithograph; or 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, or resampling. Descreening, quantizing and noise
filtering are methods used to reduce noise which, besides
producing 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.

Completeness Report:
Image completeness is checked by visually inspecting a sampling of D.R.Gs. Each selected D.R.G. will be examined
for gaps (missing data) in the main body of the map, the
map collar, the over-edge areas and any insets.

Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report:
A random sampling of D.R.Gs. will be tested for accuracy. The accuracy test will be performed by comparing the
positions of U.T.M. grid intersections on the source
graphic against the corresponding location on the digital
image. A visual inspection will determine whether those
co-ordinates fall within the pixels that define a grid
tick. D.R.Gs. duplicate the horizontal accuracy of its source.

Vertical Positional Accuracy:

Vertical Positional Accuracy Report:
In the D.R.G. the vertical positional accuracy is referenced in the D.R.G. collar.

Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: U.S. Geological Survey
Publication Date: 0000
Title: U.S.G.S. Topographic Maps
Geospatial Data Presentation Form: map
Other Citation Details:
The source for D.R.Gs. are the standard quadrangle format U.S.G.S. topographic maps, as described in the Federal
Geographic Data Committee ""Manual of Federal Geographic
Data Products"". They include 1:20,000-, 1:24,000-,
1:30,000-, 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
orthophoto maps.

Source Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date:
Beginning Time: Unknown
Ending Date: Present
Ending Time: Unknown

Source Currentness Reference: ground condition

Source Citation Abbreviation: U.S.G.S. topo.
Source Contribution:
The standard area of coverage of a D.R.G. is the entire area printed on a U.S.G.S. standard series topographic map,
including the map collar, any over-edge areas, and insets.
These standard series maps include: 7.5-minute
maps series: covers limited areas of the conterminous
United States of America, Hawai'i and limited areas of
Alaska at 1:24,000 and 1:25,000 scales; 7.5-
by 15-minute map series: covers limited areas of the
conterminous United States of America at 1:25,000 scale;
30-by 60-minute map series: conterminous United States of America.

Process Step:

Process Description:
Production of a D.R.G. 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 d.p.i.
(dots per inch), 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
U.T.M. co-ordinates 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 U.T.M. co-ordinates. The U.S.G.S. 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 d.p.i. 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 D.R.G. is then
standardized, by replacing the original R.G.B. values
assigned during the scanning process with standard
R.G.B.-value combinations, using the in-house-produced
TIFFREMAP program.
The DRG's in the Oregon Coastal Atlas have been cropped and
Re-projected by the OGDC into the OGIC projection.

Cloud Cover: 0

Direct Spatial Reference Method: Raster
Raster Object Information:

Raster Object Type: Pixel
Row Count: 5827
Column Count: 4422

Horizontal Coordinate System Definition:

Planar:

Map Projection:

Map Projection Name: Lambert Conformal Conic
Lambert Conformal Conic:

Standard Parallel: 43
Standard Parallel: 45.5
Longitude of Central Meridian: -120.5
Latitude of Projection Origin: 41.75
False Easting: 400000
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:

Abscissa Resolution: 0
Ordinate Resolution: 0

Planar Distance Units: international feet

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257

Overview Description:

Entity and Attribute Overview:
Each raster entity or pixel contains a digital number from 0 through 12, referencing a color palette of R.G.B. values
from 0 through 255, in which the standard colors used in
the D.R.G. are defined.

Entity and Attribute Detail Citation:
Each raster entity or pixel contains a digital number from 0 through 12, referencing a color palette of R.G.B. values
from 0 through 255, in which the standard colors used in
the D.R.G. are defined.

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: U.S. Geological Survey; E.R.O.S. Data Center
Contact Person: Customer Services

Contact Position: Customer Services Representative
Contact Address:

Address Type: mailing and physical address
Address: U.S. Geological Survey, E.R.O.S. Data Center
City: Sioux Falls
State or Province: S.D.
Postal Code: 57198-0001
Country: U.S.A.

Contact Voice Telephone: (605) 594-6151
Contact Facsimile Telephone: (605) 594-6589
Contact Electronic Mail Address: custserv@edcmail.cr.usgs.gov
Hours of Service: 7:30 a.m. to 4:00 p.m. C.T.

Resource Description: D.R.G. C.D.-R.
Distribution Liability:
Although these data have been processed successfully on a computer system at the U.S.G.S., no warranty expressed or
implied is made by the U.S.G.S. regarding the use of the
data on any other system, nor does the act of distribution
constitute any such warranty. The U.S.G.S. 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. Questions about the re-
projection precess should be directed to OGDC.

Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: Tagged Image File Format (T.I.F.F.) version 6.0

Digital Transfer Option:

Offline Option:

Offline Media: C.D.-R.O.M.
Recording Format: I.S.O. 9660
Compatibility Information: None.

Fees: Current costs are available at Web site <edcwww.cr.usgs.gov/glis/hyper/order_info/prices#DRG_CD>.
Ordering Instructions:
D.R.G. file size may necessitate distribution on multiple C.D.-R.O.Ms. Dataset
searching and ordering capabilities are available through
the Global Land Information System (G.L.I.S.) at Web site
<edcwww.cr.usgs.gov/webglis>. Turnaround: a.s.a.p.

Metadata Date: 3/21/2003
Metadata Review Date: 3/21/2003
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: O.S.U. Geosciences Department
Contact Person: Anthea Fallen-Bailey

Contact Position: Coastal Atlas Metadata Intern
Contact Address:

Address Type: Mailing and physical address
Address: 104 Wilkinson Hall, Oregon State University
City: Corvallis
State or Province: OR.
Postal Code: 97330.
Country: U.S.A.

Contact Voice Telephone: (541) 737-1201
Contact Facsimile Telephone: (541) 737-1200
Contact Electronic Mail Address: geo-oss@geo.orst.edu / wrightd@geo.orst.edu
Hours of Service: 8:00 a.m. to 5 p.m., Mon. - Fri.

Metadata Standard Name: F.G.D.C. Content Standard for Digital Geospatial Metadata (C.S.D.G.M.)
Metadata Standard Version: FGDC-STD-001-1998