USGS Topographic Maps 24k


Identification Information:
Citation:
Citation Information:
Publication Date: 1999
Title: USGS Topographic Maps 24k
Online Linkage: https://gis.maine.gov/arcgis/rest/services/imageryBaseMapsEarthCover/topoUsgs24k/ImageServer
Description:
Abstract: These are .TIFF format images of US Geological Survey (USGS) 7.5 minute series topographic maps, clipped from USGS Digital Raster Graphics (DRGs) for Maine. DRGCLIPs do not include map collar information. Each image represents the area, of a USGS DRG, inside the map neatline and is georeferenced to the surface of the Earth. DRGCLIPs retain, from the USGS DRG source, the associated .tfw files and the GeoTIFF 0.2 specifications that define a set of TIFF tags. The tags describe all cartographic information associated with the source file. This GeoTIFF information now contains the UTM projection and the NAD83 datum. DRGCLIPs retain the 8-bit color image of the USGS DRGs. USGS DRGs employ a standardized color palette to ensure uniform colors throughout.Digital raster graphics (DRG) were produced from 1995 to 1998 by the U.S. Geological Survey (USGS) through an innovative partnership agreement with the Land Information Technology Company, Ltd., of Aurora, Colorado. The objective of the program was to scan all USGS standard quadrangle maps quickly and at low cost.Most DRGs are made by scanning published paper maps on high-resolution scanners. The raster image is georeferenced and fit to the Universal Transverse Mercator (UTM) projection. Colors are usually standardized to duplicate the line-drawing character of the published map. The average data set size of a 7.5-minute DRG is about 8 megabytes in Tagged Image File Format (TIFF) with PackBits compression.
Purpose: Georeferenced topographic maps for State of Maine, 1:24000 series
Status:
Progress: Complete
Maintenance and Update Frequency: None planned
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -71.5474
East Bounding Coordinate: -66.4937
North Bounding Coordinate: 47.6013
South Bounding Coordinate: 42.9511
Keywords:
Theme:
Theme Keyword Thesaurus: ISO 19115 Topic Categories
Theme Keyword: imageryBaseMapsEarthCover
Place:
Place Keyword Thesaurus: None
Place Keyword: Maine
Access Constraints: None
Use Constraints: None. However, users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data.Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002 and coordinated by MEGIS
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Maine GeoLibrary
Contact Position: GIS Coordinator
Contact Address:
Address Type: mailing and physical
Address: 51 Commerce Dr, 3rd floor
City: Augusta
State or Province: ME
Postal Code: 04330
Country: US
Contact Electronic Mail Address: GeolibraryBoard.OIT@maine.gov
Data Set Credit: USGS
Metadata Reference Information:
Metadata Date: 20190108
Metadata Contact:
Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Time Convention: local time