File: G3208638.M24 December 7, 1994 Digital Raster Graphic - DRAFT METADATA INFORMATION ABOUT THIS FILE ------------- 1. Data elements are in uppercase followed by a value. 2. Numbers preceding data elements refer to section numbers in the "Content Standards for Digital Geospatial Metadata" (6-8-94). 3. Section numbers preceded by an asterisk (*) indicate elements that are considered file specific. 4. Element values specified by the "Content Standards for Digital Geospatial Metadata" are prefaced and followed by double quotation marks. --Identification Information-- -Citation- *8.1 ORIGINATOR: U.S. Geological Survey *8.2 PUBLICATION DATE: 19941121 *8.4 TITLE: MONTGOMERY NORTH 8.6 GEOSPATIAL DATA PRESENTATION FORM: "map" -Publication Information- 8.8.1 PUBLICATION PLACE: Reston, VA 8.8.2 PUBLISHER: U.S. Geological Survey -Description- 1.2.1 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. 1.2.2 PURPOSE: A DRG is useful as a source or background layer in a GIS, as a means to QC/QA other digital products, and as a source for the collection and revision of Digital Line Graph (DLG) data. DRG's can also be merged with other digital data, e.g. digital elevation models or digital orthophotos, to produce a hybrid digital file. *1.2.3 SUPPLEMENTAL INFORMATION: The UTM meter coordinates of pixel 1,1 are: x = 557855.845041 y = 3596665.161424 -Time period of content- Single Date/Time *9.1.1 CALENDAR DATE: 1958 1.3.1 CURRENTNESS REFERENCE: "Ground Condition" -Status- 1.4.1 PROGRESS: "Complete" 1.4.2 MAINTENANCE AND UPDATE FREQUENCY: "Irregular" -Spatial Domain- Bounding Coordinates *1.5.1.1 WEST BOUNDING COORDINATE: -86.375 *1.5.1.2 EAST BOUNDING COORDINATE: -86.250 *1.5.1.3 NORTH BOUNDING COORDINATE: 32.500 *1.5.1.4 SOUTH BOUNDING COORDINATE: 32.375 -Keywords- Theme 1.6.1.1 THEME KEYWORD THESAURUS: "None" 1.6.1.2 THEME KEYWORD: digital raster graph 1.6.1.2 THEME KEYWORD: DRG 1.6.1.2 THEME KEYWORD: topographic map Place 1.6.2.1 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. *1.6.2.2 PLACE KEYWORD: US 1.6.2.1 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. *1.6.2.2 PLACE KEYWORD: AL 1.7 ACCESS CONSTRAINTS: "None" 1.8 USE CONSTRAINTS: Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. *1.11 DATA SET CREDIT: Not Applicable --Data Quality Information-- -Attribute Accuracy- 2.1 ATTRIBUTE ACCURACY REPORT: The DRG is an 8-bit color image which employs a color palette to ensure uniform colors throughout a particular DRG series. That is to say, if a color is defined as having a particular RGB value, for all DRG's within that series, the RGB value is the same. 2.2 LOGICAL CONSISTENCY REPORT: Not Applicable 2.3 COMPLETENESS REPORT: The Digital Raster Graphic (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 digital raster graphic 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/inclusion criteria, see NMD Product Standards for DLG and Quadrangle Maps, published as the Technical Instructions. -Positional Accuracy- Horizontal Positional Accuracy 2.4.1.1 HORIZONTAL POSITIONAL ACCURACY REPORT: While the datum of the published map is retained, in order to be consistent with other USGS digital data, this image is cast on the UTM and may therefore be INCONSISTENT with the credit note on the image collar. Vertical Positional Accuracy 2.4.2.2 VERTICAL POSITIONAL ACCURACY REPORT: Refer to the DRG collar for information about vertical positional accuracy. -Lineage- Source Information Source Citation 2.5.1.5 SOURCE CITATION ABBREVIATION: map1 8.1 ORIGINATOR: U.S. Geological Survey *8.2 PUBLICATION DATE: 1982 *8.4 TITLE: MONTGOMERY NORTH, ALA. *8.6 GEOSPATIAL DATA PRESENTATION FORM: "map" --Publication Information-- 8.8.1 PUBLICATION PLACE: Reston, VA 8.8.2 PUBLISHER: U.S.Geological Survey *2.5.1.2 SOURCE SCALE DENOMINATOR: 24000 *2.5.1.3 TYPE OF SOURCE MEDIA: "paper" -Source Time Period of Content- Single Date/Time *9.1.1 CALENDAR_DATE: 1981 2.5.1.4.1 SOURCE CURRENTNESS REFERENCE: "ground condition" 2.5.1.6 SOURCE CONTRIBUTION: The source map is scanned to produce the digital raster graphic. -Process Step- 2.5.2.1 PROCESS DESCRIPTION: The production procedures, instrumentation, hardware and software used in the collection of standard U.S. Geological Survey (USGS) Digital Raster Graphic (DRG) products vary depending on systems used at the contract, cooperator or National Mapping Division (NMD) production sites. The majority of DRG datasets are acquired through government contract. The process step describes, in general, the process used in the production of standard USGS DRG datasets. 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 16 2.5-minute grid ticks which are obtained using the in-house produced program COORDAT and stored in a ground control file. Those 16, 2.5-minute ticks are interactively visited and assigned their respective UTM coordinate. USGS program XSHAPES4 then performs a piecewise linear rubber sheet transformation. 4. An output resolution of 2.4 meters (7.9 feet) is chosen in order to resample the file to 250 dots per inch (dpi). 5. The image file is converted to a Tagged Image File Format (TIFF), and further reduced by converting the file to a run length encoding PackBit 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 archival 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 to 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 to the corresponding image points in the DRG. *2.5.2.2 SOURCE USED CITATION ABBREVIATION: map1 *2.5.2.3 PROCESS DATE: 19941121 --Spatial Data Organization Information-- 3.2 DIRECT SPATIAL REFERENCE METHOD: "Raster" -Raster Object Information- 3.4.1 RASTER OBJECT TYPE: "Pixel" *3.4.2 ROW COUNT: 5854 *3.4.3 COLUMN COUNT: 7109 --Spatial Reference Information-- -Horizontal Coordinate System Definition- Planar Grid Coordinate System 4.1.2.2.1 GRID COORDINATE SYSTEM NAME: "Universal Transverse Mercator" Universal Transverse Mercator *4.1.2.2.2.1 UTM ZONE NUMBER: 16 Transverse Mercator 4.1.2.1.2.17 SCALE FACTOR AT CENTRAL MERIDIAN: 0.9996 *4.1.2.1.2.2 LONGITUDE AT CENTRAL MERIDIAN: -87.000 4.1.2.1.2.3 LATITUDE OF PROJECTION ORIGIN: 0.0 4.1.2.1.2.4 FALSE EASTING: 500000. 4.1.2.1.2.5 FALSE NORTHING: 0.0 --Planar Coordinate Information-- 4.1.2.4.1 PLANAR COORDINATE ENCODING METHOD: "row and column" -Coordinate Representation- *4.1.2.4.2.1 ABSCISSA RESOLUTION: 2.4 *4.1.2.4.2.2 ORDINATE RESOLUTION: -2.4 4.1.2.4.4 PLANAR DISTANCE UNITS: "meters" -Geodetic Model- *4.1.4.1 HORIZONTAL DATUM NAME: "North American Datum of 1927" *4.1.4.2 ELLIPSOID NAME: "Clark 1866" *4.1.4.3 SEMI-MAJOR AXIS: 6378206.4 *4.1.4.4 DENOMINATOR OF FLATTENING RATIO: 294.98 --Entity and Attribute Information-- -Overview Description- 5.2.1 ENTITY AND ATTRIBUTE OVERVIEW: Each raster entity or pixel contains a color index from 0 through 11 referencing a color palette of RGB values from O through 255 in which the standard colors used in the DRG are defined. Index R G B 0 0 0 0 Black 1 255 255 255 White 2 60 80 240 Blue 3 240 20 20 Red 4 144 66 45 Brown 5 210 240 170 Light Green 6 150 115 56 Light Brown 7 200 20 160 Purple 8 190 225 225 Light Blue 9 255 160 255 Light Purple 10 255 190 190 Light Red ll 200 200 200 Grey 5.2.2 ENTITY AND ATTRIBUTE DETAIL CITATION: Draft Standards for Digital Raster Graphic. --Distribution Information-- -Distributor- Contact Organization Primary 10.1.2 CONTACT ORGANIZATION: Earth Science Information Center, U.S. Geological Survey Contact Address 10.4.1 ADDRESS TYPE: "mailing address" 10.4.2 ADDRESS: 507 National Center 10.4.3 CITY: Reston 10.4.4 STATE OR PROVINCE: Virginia 10.4.5 POSTAL CODE: 22092 10.5 CONTACT VOICE TELEPHONE: 1 800 USA MAPS 10.5 CONTACT VOICE TELEPHONE: 1 703 648 6045 6.3 DISTRIBUTION LIABILITY: Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the USGS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. The Geological Survey 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 6.4.2.1.1 FORMAT NAME: TIFF 6.4.2.1.2 FORMAT VERSION NUMBER: 5.0 6.4.2.1.6 FILE DECOMPRESSION TECHNIQUE: PackBit Digital Transfer Option Offline Options 6.4.2.2.2.1 OFFLINE MEDIA: "CD-ROM" 6.4.2.2.2.3 RECORDING FORMAT: "ISO 9660"; Digital raster graphic image files with corresponding metadata files. 6.4.3 FEES: This CD-ROM is being offered in limited quantity, free of charge to the public, as a sampler of the new DRG product being produced by the U.S. Geological Survey. Future deliveries of production DRG's on CD-ROM will cost $32 per disc. --Metadata Reference Information-- *7.1 METADATA DATE: 19941121 Metadata Contact Contact Organization Primary 10.1.2 CONTACT ORGANIZATION: U.S. Geological Survey Contact Address 10.4.1 ADDRESS TYPE: "mailing address" 10.4.2 ADDRESS: 590 National Center 10.4.3 CITY: Reston 10.4.4 STATE OR PROVINCE: Virginia 10.4.5 POSTAL CODE: 22092 10.5 CONTACT VOICE TELEPHONE: 1 703 648 4533 10.8 CONTACT ELECTRONIC MAIL ADDRESS: Copies of this publication are available from anonymous File Transfer Protocol (anonymous FTP); ftp://fgdc.er.usgs.gov/ 7.5 METADATA STANDARD NAME: "Content Standards for Digital Geospatial Metadata" 7.6 METADATA STANDARD VERSION: 19940608