Roseburg 250K USGS DRG (C43122a1)

Citation:

Citation Information:

Originator: USGS
Publication Date: Unknown
Title: Roseburg 250K USGS DRG (C43122a1)
Geospatial Data Presentation Form: Map
Publication Information:

Publication Place: Unknown
Publisher: USGS via GIS Data Depot

Other Citation Details:
The state service center does not make 250k DRG's available to users in Oregon, although they are available from USGS directly. For the Atlas project, we downloaded 10 coastal 250k DRG's from the GIS data depot, clipped the collars using the standard 250k quad coverage, and reprojected them in Arc Info 8 to the Oregon Lambert Projection. No other
corrections were made to the images, and they are provided "as is" for reference only.

Online Linkage: http://www.gisdatadepot.com

Description:

Abstract: Roseburg 250K DRG (C42120a1) Reprojected from original into the Oregon Lambert Projection
Purpose:
The DRG is useful as a backdrop onto which other digital data can be overlaid. At the USGS, the DRG is used for validating 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.
Supplemental Information:
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 extraction 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. Data production is through an innovative partnership agreement with Land Information Technologies, Ltd., of Aurora, Colo. The order and rate of production will be determined by user requirements and by partnerships with Federal and State agencies. Full coverage of the contiguous United States is expected to be completed in late 1997.

Time Period of Content:

Time Period Information:

Range of Dates/Times:

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

Currentness Reference: Unknown

Status:

Progress: Complete
Maintenance and Update Frequency: None planned

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -120.8299
East Bounding Coordinate: -113.4282
North Bounding Coordinate: 49.2988
South Bounding Coordinate: 45.6936

Keywords:

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: coastal atlas
Theme Keyword: coastal management
Theme Keyword: coastal resources
Theme Keyword: topographic map

Place:

Place Keyword Thesaurus: None
Place Keyword: Oregon
Place Keyword: Oregon Coast
Place Keyword: Pacific Northwest

Access Constraints: None
Use Constraints: None
Point of Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Oregon Ocean Coastal Management Program
Contact Person: Coastal GIS Coordinator

Contact Position: Coastal GIS Coordinator
Contact Address:

Address Type: mailing address
Address: 800 NE Oregon St #18
City: Portland
State or Province: OR
Postal Code: 97232
Country: USA

Contact Voice Telephone: 503-731-4065 x31
Contact Facsimile Telephone: 503-731-4068
Contact Electronic Mail Address: randy.dana@state.or.us

Data Set Credit: U.S.Geological Survey (USGS)
Native Data Set Environment: Digital Raster Graphics TIFF

Attribute Accuracy:

Attribute Accuracy Report:
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).

Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report:
The horizontal positional accuracy of the DRG matches the accuracy of the published source map. To be consistent with other USGS digital data, the image is cast on the UTM projection and will, therefore, not always be consistent with the credit note on the image collar. Only the area inside the map neatline is georeferenced, so minor distortion of the text may occur in the map collar. The distributed 1:24,000-scale DRG at 250 dpi will have a ground sample distance of 2.4 meters (8 feet).
Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: USGS
Publication Date: Unknown
Title: USGS Digital Raster Graphics (DRG) C43122a1
Geospatial Data Presentation Form: map
Publication Information:

Publication Place: Unknown
Publisher: USGS via GIS Data Depot

Online Linkage: http://www.gisdatadepot.com

Source Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Time: Unknown
Ending Time: Unknown

Process Step:

Process Description:
Producing a DRG Four items are needed to produce a DRG of a 7.5-minute topographic map: 1.a USGS topographic map, 2.the Universal Transverse Mercator (UTM) coordinates of the sixteen 2 .5-minute grid ticks for georeferencing and rectification, 3.a digital image produced by scanning a USGS map on a high-resolution scanner, and 4.software to correct distortion and reference the scanned raster image to ground coordinates. At the USGS, the first step in the process is to scan a paper 7.5-minute topographic map at 250 dots per inch. The position of each of the sixteen 2.5-minute grid ticks on the image is collected. Software uses these coordinates to rectify and georeference the image to the UTM ground coor
dinates. A bilinear transformation completes the georeferencing. The image is compressed using lossless compression to reduce the size of the data set. The final result is a compressed TIFF 6.0 file. The file size range is between 5 to 15 megabytes. Specifications The standard USGS 7.5-minute DRG has the following specifications: The source material for a DRG is a paper USGS topographic map. The USGS DRG's are in TIFF 6.0 and employ GeoTIFF 0.2 specifications to define a set of TIFF tags. These tags describe all cartographic information associated with the file. The map is scanned at a minimum resolution of 250 dpi. The digital image is georeferenced to the true ground coordinates of the 2.5-minute grid ticks and projected to the UTM for projection consistency with USGS DOQ's and DLG's. The datum of the source materials is preserved in the DRG. If scanned at a finer resolution, the image is resampled to 250 dpi. The image is converted to an 8-bit color image in a compressed TIFF file. Color values are standard between DRG quadrangles. The USGS employs up to 13 colors on each DRG.
Color values are contained in each TIFF file. The digital image is accompanied by a metadata file that complies with the Federal Geographic Data Committee's Content Standards for Digital Geospatial Metadata (June 8, 1994). The DRG's will be available on Compact Disc-Recordable (CD-R); each CD-R includes the USGS topographic maps for a 1-degree cell. For the contiguous States plus Hawaii, the cells will usually contain sixty-four 1:24,000-scale files, two 1:100,000-scale files and one 1:250,000-scale file. Variability in the number of files and area covered occurs over irregularly-shaped land masses; for example, 1-degree cells that encompass coastal areas may include fewer files.

Cloud Cover: 0

Direct Spatial Reference Method: Raster
Raster Object Information:

Raster Object Type: Pixel
Row Count: 4565
Column Count: 6498

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

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: Oregon Ocean Coastal Management Program
Contact Person: Coastal GIS Coordinator

Contact Position: Coastal GIS Coordinator
Contact Address:

Address Type: mailing address
Address: 800 NE Oregon St #18
City: Portland
State or Province: OR
Postal Code: 97232
Country: USA

Contact Voice Telephone: 503-731-4065 x31
Contact Facsimile Telephone: 503-731-4068
Contact Electronic Mail Address: randy.dana@state.or.us

Available Time Period:

Time Period Information:

Single Date/Time:

Calendar Date: 1987
Time of Day: Unknown

Metadata Date: 2/27/2002
Metadata Review Date: 2/27/2002
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: OSU and Oregon Ocean Coastal Management Program
Contact Person: Tanya Haddad

Contact Position: NOAA Coastal Management Fellow
Contact Address:

Address Type: mailing and physical address
Address: 800 NE Oregon St. #18, Suite 1145
City: Portland
State or Province: OR
Postal Code: 97232
Country: USA

Contact Voice Telephone: 503-731-4065 ext. 30
Contact Facsimile Telephone: 503-731-4068
Contact Electronic Mail Address: tanya.haddad@state.or.us
Hours of Service: 9am - 5pm

Metadata Standard Name: FGDC CSDGM
Metadata Standard Version: FGDC-STD-001-1998