#GIS DIGITAL RASTER GRAPHIC UPDATE#
#GIS DIGITAL RASTER GRAPHIC SOFTWARE#

The original DRG data is: '.a faithfully reproduced digital image of the original source map. Differences in colors are the result of the original scanning process and not the post processing work. 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. Michigan DRG 24k data are georectified TIFF (5.0) files that have been saved as 8-bit color images. Security Classification System: unclassified Box 30448, Stephens T Mason BuildingĬontact Facsimile Telephone: (517) 335-3264 Theme Keyword: USGS Digital Raster GraphicsĬontact Organization: MDNR, Land and Mineral Services Division, Resource Mapping and Aerial PhotographyĬontact Person: MDNR, Land and Mineral Services Division, Resource Mapping and Aerial PhotographyĪddress Type: mailing and physical addressĪddress: P.O.

#GIS DIGITAL RASTER GRAPHIC UPDATE#

Maintenance and Update Frequency: None planned 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.Ĭurrentness Reference: Accuracy of map features may vary depending on the date of the printed USGS 7.5-minute quadrangles. Michigan DRG 24k provides a means by which GIS users can efficiently access USGS 7.5-minute topographic quadrangles. Alger, Chippewa, Delta, Gogebic, Houghton, Iron, Mackinac, Marquette, Menominee, Ontonagon, and Schoolcraft). Several large counties have been divided into either east and west or north and south halves (e.g. Island groups are located in 'Isle_Royal' and 'Lake_Michigan_Islands' folders respectively. Isle Royal, Beaver Island, and South Fox Island). Each county DRG TIFF and its accompanying world file are organized by county except for several island groups (e.g. We have both quadrangle and county DRG files. The quadrangles have been merged into county files.

#GIS DIGITAL RASTER GRAPHIC SOFTWARE#

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.

Note: These files are not in GeoTIFF format. TIFF files are assembled and organized in alphabetical order.

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. Title: Digital Raster Graphic (Topographic Map) Originator: Michigan Department of Natural Resources Digital Raster Graphic (Topographic Map) Digital Raster Graphic (Topographic Map)

Gis digital raster graphic