Chapman Bench Quadrangle - Digital Raster Graphic (DRG)

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: United States Geological Survey (USGS)
Publication_Date: 19970512
Title: Chapman Bench
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, VA
Publisher: USGS
Description:
Abstract: The Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic map including the collar information, georeferenced to the UTM grid.
Purpose: A DRG is useful as a source or background layer in a GIS, as a means to perform quality assurance on other digital products, and as a source for the collection and revision of DLG data. DRG's can also be merged with other digital data, e.g. DEM's or DOQ's, to produce a hybrid digital file.
Supplemental_Information: 637453.117192152070, 4971339.285048984900
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19970512
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -109.250000
East_Bounding_Coordinate: -109.125000
North_Bounding_Coordinate: 44.875000
South_Bounding_Coordinate: 44.750000
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: digital raster graphic
Theme_Keyword: DRG
Theme_Keyword: topographic map
Place:
Place_Keyword_Thesaurus: Department of Commerce, 1977, Countries, Dependencies, Areas of Special Sovereignty, and their Principal Administrative Divisions (Federal Information Processing Standard 10-3): Washington, Department of Commerce, National Institute of Standards and Technology.
Place_Keyword: US
Place_Keyword_Thesaurus: 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, Department of Commerce, National Institute of Standards and Technology.
Place_Keyword: WY
Access_Constraints: None
Use_Constraints: Should not be used at scales greater than 1:24,000. Acknowledgment of the USGS would be appreciated in products derived from these data.
Data_Set_Credit: This DRG was produced through an Innovative Partnership agreement between The Land Information Technology Company, Ltd., of Aurora, CO and the USGS.

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: 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.
Logical_Consistency_Report: Not Applicable
Completeness_Report: The DRG is a faithfully reproduced digital image of the original source map. Some differences may be detected between the source graphic used and the DRG due to the RGB values assigned that particular color. The intent is to recreate those colors as near as possible. Data completeness for DRG files reflect content of the source graphic. Features may have been eliminated or generalized on the source graphic due to scale and legibility constraints. For information on collection and inclusion criteria, see U.S. Geological Survey, 1994, Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps: National Mapping Program Technical Instructions and U.S. Geological Survey, 1994, Standards for Digital Line Graphs: National Mapping Program Technical Instructions.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: While the datum of the published map is retained to be consistent with other USGS digital data, this image is cast on the UTM and may be INCONSISTENT with the credit note on the image collar.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Refer to the DRG collar for information about vertical positional accuracy.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: USGS
Publication_Date: 1987
Title: Chapman Bench
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, VA
Publisher: USGS
Source_Scale_Denominator: 24000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1987
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: map1
Source_Contribution: The source map is scanned to produce the DRG.
Process_Step:
Process_Description:
The production procedures, instrumentation, hardware, and software used in the collection of standard DRG products vary depending on systems used at the contract, cooperator or USGS production sites. The majority of DRG data sets are acquired through government contract. The process step describes, in general, the process used in the production of standard DRG data sets.

1) 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 - 1000 dpi with the output file running between 160-300 mb.

2) Removal of screens (descreening) and color quantization to reduce the number of colors also takes place during the scanning phase.

3) 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. USGS program XSHAPES4 then performs a piecewise linear rubber sheet transformation.

4) An output resolution of 2.4 meters (8.2 feet) is chosen in order to resample the file to 250 dpi.

5) The image file is converted to a TIFF and further reduced by converting the file to a run length encoding Packbits compression (type 32773).

6) 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.

7) Prior to archiving the DRG undergoes the following quality assurance procedures:

a) The color index values of each DRG are checked to ensure the RGB combinations are consistent with the standardized color palette.

b) All DRG files are inspected to ensure that they are geometrically consistent with normal map presentation.

c) Selected DRG 's are checked to ensure that data elements in the DRG metadata file correspond to the map collar information and to the information in the associated image file.

d) Selected DRG 's are checked for georeferencing accuracy by comparing the book value of latitude and longitude tick marks with corresponding tick intersections in the DRG image.

e) Transformations are checked on selected DRG's by comparing the positions of well defined points, such as UTM grid intersections in the graphic product, with the corresponding image points in the DRG.

USGS DRG production specifications are available on request from the National Mapping Division and Mid-Continent Mapping Center by contacting:

Rolla-ESIC
U.S.Geological Survey
1400 Independence Rd., MS231
Rolla, MO 65401-2602
Phone (573)308-3500
Facsimile (573)308-3615
E-mail to mcmcesic@usgs.gov
World Wide Web: http://mcmcweb.er.usgs.gov/drg/

Source_Used_Citation_Abbreviation: map1
Process_Date: 19970512
Process_Step:
Process_Description:
The MapInfo .TAB files were generated using WorldReg version 3.0 developed by Data Directions, 4560 Fox Hollow Rd., Eugene, OR 97405, (541) 345-4MAP, E-mail: MapData@aol.com, URL: http://members.aol.com/mapdata/. From the program documentation:

"The WorldReg MapBasic application runs with MapInfo and automates the Image Registration process MapInfo requires to display raster images. WorldReg creates MapInfo Tables automatically, which are used to open the georeferenced raster image. Once the raster image is open, MapInfo vector data can be displayed accurately on top of the georeferenced image."

MapInfo is a trademark of MapInfo Corporation.

Process_Date: 19980327
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Wyoming, A&I, Economic Analysis, Office of GIS
Contact_Address:
Address_Type: mailing and physical address
Address: Rm. 327E Emerson Bldg.
City: Cheyenne
State_or_Province: Wyoming
Postal_Code: 82002
Country: USA

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 6802
Column_Count: 4829

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 12
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -111.000
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 2.438400000000
Ordinate_Resolution: 2.4384
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Each raster entity or pixel contains a color index 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.

USGS DRG Color Palette

Digital Number Color Red Green Blue
0Black000
1White255255255
2Blue0151164
3Red203023
4Brown1316637
5Green201234157
6Purple13751128
7Yellow2552340
8Light Blue167226226
9Light Red255184184
10Light Purple218179214
11Light Grey209209209
12Light Brown207164142

Entity_and_Attribute_Detail_Citation: Draft Standards for Digital Raster Graphics

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Earth Science Information Center, U.S. Geological Survey Contact Address
Contact_Address:
Address_Type: mailing address
Address: 507 National Center
City: Reston
State_or_Province: Virginia
Postal_Code: 22092
Contact_Voice_Telephone: (800) USA-MAPS
Contact_Voice_Telephone: (703) 648-6045
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: TIFF
Format_Version_Number: 6.0
File_Decompression_Technique: Packbits
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660; DRG image files with corresponding metadata files.
Fees: For delivery on CD-ROM, the charge is $32 per CD-ROM.
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Wyoming, A&I, Economic Analysis, Office of GIS
Contact_Address:
Address_Type: mailing and physical address
Address: Rm. 327E Emerson Bldg.
City: Cheyenne
State_or_Province: Wyoming
Postal_Code: 82002
Country: USA
Resource_Description: Chapman Bench Quadrangle - Digital Raster Graphic (DRG): O44109g2
Distribution_Liability: Although these data have been processed successfully on a computer system, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. The State of Wyoming does not waive sovereign immunity by distributing these data, and specifically retains immunity and all defenses available to it as sovereign pursuant to Wyo. Stat. § 1-39-104(a) and all other state law.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: TIFF
Format_Version_Number: 6.0
File_Decompression_Technique: Compressed using Pkzip. To decompress, try an unzipping utility such as Pkunzip at http://www.pkware.com/ or WinZip at http://www.winzip.com/ or InfoZip at http://www.cdrom.com/pub/infozip.
Transfer_Size: 2.08
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://wgiac.state.wy.us/wsdc/files/drg/044109/O44109g2.zip
Online_Computer_and_Operating_System: Compaq Prosignia 500, Windows NT 4.0
Fees: None

Metadata_Reference_Information:
Metadata_Date: 19980415
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Wyoming, A&I, Economic Analysis, Office of GIS
Contact_Address:
Address_Type: mailing and physical address
Address: Rm. 327E Emerson Bldg.
City: Cheyenne
State_or_Province: Wyoming
Postal_Code: 82002
Country: USA
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: June 8, 1994