Digital Raster Graphic (Topographic Map)
Section Index
Identification Information
Data Quality Information
Spatial Data Organization Information
Spatial Reference Information
Entity and Attribute Information
Distribution Information
Metadata Reference Information
Identification Information
Section Index
Citation:
Citation Information:
Originator: Michigan Department of Natural Resources
Title: Digital Raster Graphic (Topographic Map)
Publication Information:
Publication Place: Lansing, MI
Publisher: MDNR
Description:
Abstract:
Michigan DRG 24k data set consists of ready-to-use 1:24,000-scale USGS georeferenced Digital Raster Graphics (DRG) quadrangles in 8 bit TIFF file format. TIFF files are assembled and organized in alphabetical order. Note: These files are not in GeoTIFF format. Each georectified TIFF file (.tif file extension) has an accompanying world file (.twf file extension) which enables GIS and image processing software packages to place the TIFF file in space. The quadrangles have been merged into county files. We have both quadrangle and county DRG files. Each county DRG TIFF and its accompanying world file are organized by county except for several island groups (e.g. Isle Royal, Beaver Island, and South Fox Island). Island groups are located in "Isle_Royal" and "Lake_Michigan_Islands" folders respectively. Several large counties have been divided into either east and west or north and south halves (e.g. Alger, Chippewa, Delta, Gogebic, Houghton, Iron, Mackinac, Marquette, Menominee, Ontonagon, and Schoolcraft).
Purpose:
Michigan DRG 24k provides a means by which GIS users can efficiently access USGS 7.5-minute topographic quadrangles. These data were also developed to aid GIS users in recording digital data that previously needed to be transferred from paper copies of the USGS 7.5-minute topographic quadrangles.
Time Period of Content:
Currentness Reference: Accuracy of map features may vary depending on the date of the printed USGS 7.5-minute quadrangles.
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Keywords:
Theme:
Theme Keyword Thesaurus: none
Theme Keyword: DRG
Theme Keyword: Michigan Counties
Theme Keyword: USGS Digital Raster Graphics
Place:
Place Keyword Thesaurus: None
Place Keyword: Michigan Counties
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: MDNR, Land and Mineral Services Division, Resource Mapping and Aerial Photography
Contact Person: MDNR, Land and Mineral Services Division, Resource Mapping and Aerial Photography
Contact Address:
Address Type: mailing and physical address
Address: P.O. Box 30448, Stephens T Mason Building
City: Lansing
State or Province: MI
Postal Code: 48909-7984
Country: USA
Contact Voice Telephone: (517) 241-2254
Contact Facsimile Telephone: (517) 335-3264
Hours of Service: 8:00a.m. - 5:00p.m.
Security Information:
Security Classification System: unclassified
Native Data Set Environment: TIFF 5.0
Data Quality Information
Section Index
Attribute Accuracy:
Attribute Accuracy Report:
Michigan DRG 24k data are georectified TIFF (5.0) files that have been saved as 8-bit color images. The same color palette and Red Green Blue (RGB) values were used for each file to ensure uniform colors throughout the counties and between counties. Differences in colors are the result of the original scanning process and not the post processing work.
Completeness Report:
The original DRG data 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…" (USGS Metadata). Note: Original colors were not changed during post processing of the original data.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
The pixel resolution of each TIFF image has been set to 2.5 meters + .1 meter (approximately 250 dpi). The horizontal accuracy of the original scanned paper quadrangles meets National Map Accuracy Standards for 1:24,000-scale maps.
Vertical Positional Accuracy:
Vertical Positional Accuracy Report: Contour interval is variable dependent on the quadrangle.
Lineage:
Process Step:
Process Description:
Original DRG data were imported into ARC/INFO and clipped using the 7.5-minute quadrangle boundaries generated by the Resources Mapping and Photography office (RMAP). Clipping removed the edge of the map to facilitate clean mosaicing. Prior to clipping, "overedged" quadrangle boundaries and attributes had to be added to the quadrangle boundary map.
Process Date: Unknown
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Krist, Frank
Contact Organization: Pacific Meridian Resources (Spatial Information Resource Center - Roscommon)
Contact Position: GIS/Remote Sensing Analyst
Contact Voice Telephone: (517) 275-5151 ext.(2057)
Contact Facsimile Telephone: (517) 275-5167
Hours of Service: 8:00 a.m. - 5:00 p.m.
Process Step:
Process Description: Using ARC/INFO each clipped DRG was projected into the Michigan GeoRef coordinate system:
Process Date: Unknown
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Krist, Frank
Contact Organization: Pacific Meridian Resources (Spatial Information Resource Center - Roscommon)
Contact Position: GIS/Remote Sensing Analyst
Contact Voice Telephone: (517) 275-5151 ext.(2057)
Contact Facsimile Telephone: (517) 275-5167
Hours of Service: 8:00 a.m. - 5:00 p.m.
Process Step:
Process Description: Quadrangles were mosaiced together by county with ARC/INFO GRID.
Process Date: Unknown
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Krist, Frank
Contact Organization: Pacific Meridian Resources (Spatial Information Resource Center - Roscommon)
Contact Position: GIS/Remote Sensing Analyst
Contact Voice Telephone: (517) 275-5151 ext.(2057)
Contact Facsimile Telephone: (517) 275-5167
Hours of Service: 8:00 a.m. - 5:00 p.m.
Process Step:
Process Description:
Mosaics were clipped to county boundaries using the county boundary (polygon ARC/INFO coverage) as a mask (at the 1:100,000-scale). Coastal county boundaries were buffered approximately 400 meters (.25 miles) prior to masking the DRG to ensure that coastal map features were retained on the final DRG. A mask was used to ensure the proper clipping of a county's island areas.
Process Date: Unknown
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Krist, Frank
Contact Organization: Pacific Meridian Resources (Spatial Information Resource Center - Roscommon)
Contact Position: GIS/Remote Sensing Analyst
Contact Voice Telephone: (517) 275-5151 ext.(2057)
Contact Facsimile Telephone: (517) 275-5167
Hours of Service: 8:00 a.m. - 5:00 p.m.
Process Step:
Process Description:
Clipped county mosaics were exported as compressed georectified TIFF (5.0) (NOT GeoTIFF format) files. Each TIFF was zipped using WinZip(R) Self-Extractor 2.1 (Copyright © 1995-1997 by Nico Mak Computing, Inc.) Unzipped file sizes range from about 40 to 100 MB.
Process Date: Unknown
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Krist, Frank
Contact Organization: Pacific Meridian Resources (Spatial Information Resource Center - Roscommon)
Contact Position: GIS/Remote Sensing Analyst
Contact Voice Telephone: (517) 275-5151 ext.(2057)
Contact Facsimile Telephone: (517) 275-5167
Hours of Service: 8:00 a.m. - 5:00 p.m.
Spatial Data Organization Information
Section Index
Direct Spatial Reference Method: Raster
Raster Object Information:
Raster Object Type: Pixel
Spatial Reference Information
Section Index
Horizontal Coordinate System Definition:
Planar:
Grid Coordinate System:
Grid Coordinate System Name: Other_Grid_System's_Definition
Other Grid System's Definition:
Other Grid System's Definition: Michigan Georef from Oblique Mercator projection, Scale factor at center line = 0.9996, Azimuthal angle = 337.25556, False easting = 2546731.496, False northing = -4354009.816
Planar Coordinate Information:
Planar Coordinate Encoding Method: Coordinate Pair
Planar Distance Units: meters
Geodetic Model:
Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Denominator of Flattening Ratio: 24000
Distribution Information
Section Index
Distributor:
Contact Information:
Contact Person Primary:
Contact Person: McDonald, Donald
Contact Organization: MDNR Land and Mineral Services Division, Resource Mapping and Aerial Photography Section
Contact Address:
Address Type: mailing address
Address: P.O. Box 30448
City: Lansing
State or Province: MI
Postal Code: 48909-7948
Country: USA
Contact Voice Telephone: 517-373-2534
Contact Facsimile Telephone: 517-335-3264
Contact Electronic Mail Address: [email protected]
Hours of Service: 7:30 a.m. - 4:30 p.m.
Distribution Liability: MDNR assumes no liability for results or conclusions drawn from use of this data.
Standard Order Process:
Custom Order Process: Inquire about special distribution services.
Metadata Reference Information
Section Index
Metadata Date: 20000317
Metadata Contact:
Contact Information:
Contact Person Primary:
Contact Person: McDonald, Donald
Contact Organization: MDNR Land and Mineral Services Division, Resource Mapping and Aerial Photography Section
Contact Address:
Address Type: mailing address
Address: P.O. Box 30448
City: Lansing
State or Province: MI
Postal Code: 48909-7948
Country: USA
Contact Voice Telephone: 517-373-2534
Contact Facsimile Telephone: 517-335-3264
Contact Electronic Mail Address: [email protected]
Hours of Service: 7:30 a.m. - 4:30 p.m.
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Security Information:
Metadata Security Classification System: Unclassified
Metadata Security Classification: Unclassified
SMMS Metadata report generated 03/31/2000