This layer is a digital raster graphic of the historical 15-minute USGS topographic quadrangle maps of coastal towns in Massachusetts. These quadrangles were mosaicked together to create a single data layer of the coast of Massachusetts and a large portion of the southeastern area of the state. The Massachusetts Office of Coastal Zone Management (CZM) obtained the map images from the Harvard Map Collection. The maps were produced in the late 1890s and early 20th century at a scale of 1:62,500 or 1:63,360 and are commonly known as 15-minute quadrangle maps because each map covers a four-sided area of 15 minutes of latitude and 15 minutes of longitude. A digital raster graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) standard series topographic map. In ArcSDE the image is named IMG_USGS_HIST_COASTAL.
One of the most widely used of all maps is the topographic map. The feature that most distinguishes topographic maps from maps of other types is the use of contour lines to portray the shape and elevation of the land. Topographic maps rer the three-dimensional ups and downs of the terrain on a two-dimensional surface. Topographic maps usually portray both natural and manmade features. They show and name works of nature including mountains, valleys, plains, lakes, rivers, and vegetation. They also identify the principal works of humans, such as roads, boundaries, transmission lines, and major buildings. The wide range of information provided by topographic maps make them extremely useful to professional and recreational map users alike. Topographic maps are used for engineering, energy exploration, natural resource conservation, environmental management, public works design, commercial and residential planning, urban planning and design, and outdoor activities like hiking, camping, and fishing. These maps can provide an excellent view of the changes that have occurred in the cultural and physical landscape. As this map has been geo-referenced, it may serve as a useful basemap in conjunction with other GIS vector data.
SUPPLEMENTAL INFORMATION: The Harvard Map Collection owns a near-complete set of the 1:62,500 scale 15-minute USGS Topographic Quadrangle series maps. These maps were produced between the early 1880s to the mid-1960s. The Map Collection also holds a collection of 30-minute (1:125,000) historical (1882-1940) USGS maps. Produced at a scale of 1:62,500 (some maps are produced at a scale of 1:63,360), these maps are commonly known as 15-minute quadrangle maps because each map covers a four-sided area of 15 minutes of latitude and 15 minutes of longitude. The United States has been systematically divided into precisely measured quadrangles, and adjacent maps can be combined to form a single large map. Each quadrangle is designated by the name of a city, town or prominent natural feature within it, and the titles of adjoining quadrangles are printed on the margins of each map. The Map Collection also owns numerous other USGS topographic maps in other series with various scales, published earlier in the 20th century (before the 7.5 minute series dominated the work of the USGS) as well as USGS topographic maps published in the late 19th century
CURRENTNESS REFERENCE: ground condition
SPATIAL DATA ORGANIZATION INFORMATION Direct Spatial Reference: Raster Raster Object Type: Pixel Row Count: 36551 Column Count: 27035 Vertical Count: 1
SPATIAL REFERENCE INFORMATION - PLANAR Grid Coordinate System Name: State Plane Coordinate System SPCS Zone Identifier: 2001 Standard Parallel: 41.716667 Standard Parallel: 42.683333 Longitude of Central Meridian: -71.500000 Latitude of Projection Origin: 41.000000 False Easting: 200000.000000 False Northing: 750000.000000 Planar Coordinate Encoding Method: row and column Abscissa Resolution: 5.407842 Ordinate Resolution: 5.407842 Planar Distance Units: meters
SPATIAL REFERENCE INFORMATION - GEODETIC MODEL Horizontal Datum Name: North American Datum of 1983 Ellipsoid Name: Geodetic Reference System 80 Semi-major Axis: 6378137.000000 Denominator of Flattening Ratio: 298.257222
DATA SET CREDIT: These spatial data were created by the Massachusetts Office of Coastal Zone Management (CZM) for the Massachusetts Executive Office of Environmental Affairs (EOEA).
NATIVE: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 220.127.116.110
The original USGS Historical 15 Minute Digital Raster Graphic were from Harvard University Map Collection, Harvard College Library. Web Site http://hgl.harvard.edu
ATTRIBUTE ACCURACY REPORT: The DRG is a 24-bit per pixel color image that employs a color palette to ensure uniform colors throughout a particular DRG series. All DRGs within a series must have the same RGB value. Harvard Map Collection, Harvard College Library
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. Harvard Map Collection, Harvard College Library
HORIZONTAL POSITIONAL ACCURACY REPORT: The original USGS quadrangle paper maps in this series were produced before the National Map Accuracy Standards were developed in 1941. These standards were developed to ensure that Federal Government maps meet the high expectations and requirements of users. These standards require horizontal and vertical map precision; these and other standards of accuracy and content ensure consistency in both the detail and the appearance of maps. They also ensure compatibility among USGS maps made at different times. The positional accuracy of the original map was largely preserved during the digitizing and geo-referencing processes. Accuracy may be generally characterized as possessing the highest standards of accuracy given the general survey, instrumentation, design and printing technologies and cartographic techniques available during the time the original map was produced. The original map was scanned and geo-referenced (SEE: Process Steps) to produce this digital version. While the data of the published map is retained in the georeferenced image, the original Harvard Map Collection image is referenced to the Universal Transverse Mercator coordinate system, the CZM coastal image is referenced to State Plane Meters, which is inconsistent with the original projection of the paper map, and may lead to discrepancies in the horizontal accuracy of the DRG. The standard used for georeferencing the CZM image is State Plane Meters coordinates with an RMS error below 12 meters. See the process steps for the actual RMS error achieved.
ACCESS CONSTRAINTS: None. These data are in the public domain. GIS files are freely available for download.
DISTRIBUTION LIABILITY: Although every effort has been made to ensure the accuracy of these data, errors and conditions originating from physical sources used to develop these data may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. In no event shall CZM be liable for any damages, whether general, special, incidental or consequential damages, arising out of your use of these data. Your sole remedy for damages is to stop using the data. You agree to defend, indemnify, and hold harmless CZM and its employees against any claim, loss, liability or expense, including attorneys' fees, resulting from loss of or damage to property or the injury to or death of any person arising out of the use of the data.
USE CONSTRAINTS: Public domain data from the Massachusetts Office of Coastal Zone Management (CZM), an agency of the Commonwealth of Massachusetts Executive Office of Environmental Affairs, are freely redistributable with proper metadata and source attribution. Please recognize the Massachusetts Office of Coastal Zone Management as the source of these data. You are not permitted to use CZM's name or to suggest that CZM endorses your project or product, without its express written consent. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, CZM cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers. The user must be aware of data conditions and bear responsibility for the appropriate use of these data with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to these data.
FEES: GIS and coordinate files may be downloaded at no charge by following links on the Massachusetts Office of Coastal Zone Management website (http://www.mass.gov/czm/).
CZM DATA MANAGER Phone:
czm at state.ma.us
251 Causeway Street, Suite 800 City:
Province or State:
MrSIDGeneration 2 , 20:1 compression
See Use Constraints.
CZM DATA MANAGER Role:
czm at state.ma.us
251 Causeway Street, Suite 800 City:
Province or State:
Creation and Review Dates
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