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Bromley map of Boston Proper and Back Bay, Massachusetts, 1912, Plate 21 (Raster Image)

Identification Information
Citation
Originator
Harvard Map Collection, Harvard College Library
Originator
Bromley, George Washington.
Originator
G.W. Bromley and Co.
Publication Date
201303
Title
Bromley map of Boston Proper and Back Bay, Massachusetts, 1912, Plate 21 (Raster Image)
Geospatial Data Presentation Form
map
Publication Information
Publication Place
Cambridge, Massachusetts
Publisher
Harvard Map Collection, Harvard College Library
Online Linkage
https://hgl.harvard.edu/catalog/harvard-h004690772-0028
Abstract
This layer is a georeferenced raster image of a map plate of a section of Boston, Massachusetts from the G.W. Bromley and Co. atlas entitled: Atlas of the city of Boston : Boston proper and Back Bay, from actual surveys and official plans, by George W. and Walter S. Bromley, published 1912. This image is of Plate 21, part of ward 11, city of Boston. Scale 1:960. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Massachusetts State Plane Coordinate System, Mainland Zone (in Feet) (Fipszone 2001). All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. These large scale fire insurance maps typically include: building footprints, building construction material (frame, brick, stone, iron), stables and sheds, building floors, selected owner names, selected building functions, property boundaries, building street addresses, street names, railroads, fire hydrants, water main pipelines (with size in inches), sewers, assessors area, and more. Building construction material is shown by colored shading. The index plate of the atlas includes an explanation of map features. This layer is part of a selection of digitally scanned and georeferenced historic fire insurance and land ownership atlases of Boston and Cambridge, Massachusetts from the Harvard Map Collection. The selection of scanned atlases represents a range of originators and ground condition dates (1873-1916).
Purpose
Fire insurance and land ownership atlases published in the 19th and early 20th centuries are one of the most valuable sources for monitoring and viewing urban change. As this map has been georeferenced, it can be used in a GIS as a source or background layer in conjunction with other GIS data.
Temporal Extent
Currentness Reference
source map publication date
Time Instant
1912
Bounding Box
West
-71.088562
East
-71.076315
North
42.354908
South
42.347479
Theme Keyword
Maps
Insurance, Fire
Real property
Landowners
Buildings
Theme Keyword Thesaurus
LCSH
ISO Topic Category
imageryBaseMapsEarthCover
structure
planningCadastre
Place Keyword
Massachusetts
Boston
Back Bay
Place Keyword Thesaurus
GNIS
Temporal Keyword
Access Restrictions
None
Use Restrictions
For educational, non-commercial use only.
Status
Complete
Maintenance and Update Frequency
None planned
Point of Contact
Contact Organization
Harvard Map Collection, Harvard Library
Delivery Point
Harvard Map Collection
Delivery Point
Pusey Library
Delivery Point
Harvard University
City
Cambridge
State
MA
Postal Code
02138
Country
USA
Contact Telephone
617-495-2417
Contact Facsimile Telephone
617-496-0440
Contact Electronic Mail Address
hgl_ref@hulmail.harvard.edu
Hours of Service
Monday - Friday, 9:00 am - 4:00 pm EST-USA
Native Data Set Environment
ESRI ArcGIS 9.3.1
Data Quality Information
Attribute Accuracy Report
The georeferenced raster is a faithfully reproduced digital image of the original source map. Some differences may be detected between the source graphic used and the raster image due to the RGB values assigned that particular color. The intent is to recreate those colors as near as possible.
Completeness Report
Data completeness for raster digital image files reflect content of the source graphic. Features may have been eliminated or generalized on the source graphic due to scale and legibility constraints
Horizontal Positional Accuracy Report
The horizontal positional accuracy of a raster image is approximately the same as the accuracy of the published source map. The lack of a greater accuracy is largely the result of the inaccuracies with the original measurements and possible distortions in the original paper map document. There may also be errors introduced during the digitizing (e.g. the gutter fold of the atlas may not be perfectly flat during the imaging process) and georeferencing process. In most cases, however, errors in the raster image are small compared with sources of error in the original map graphic. The RMS error for this map is 4.38796 feet. This value describes how consistent the transformation is between the different control points (links). The RMS error is only an assessment of the accuracy of the transformation.
Lineage
Source
Originator
Bromley, George Washington.
Originator
G.W. Bromley and Co.
Publication Date
1912
Title
Atlas of the city of Boston : Boston proper and Back Bay, from actual surveys and official plans. Plate 21
Geospatial Data Presentation Form
map
Publication Information
Publication Place
Philadelphia
Publisher
G.W. Bromley and Co.
Other Citation Details
1 v. : (36 plates of col. maps)
Source Scale Denominator
960
Type of Source Media
paper
Source Temporal Extent
Time Period Information
Single Date/Time
Calendar Date
1912
Source Currentness Reference
publication date
Contribution
Source map for raster image
Spatial Data Organization Information
Direct Spatial Reference Method
Raster
Raster Object Information
Raster Object Type
Pixel
Row Count
6982
Column Count
10660
Vertical Count
1
Spatial Reference Information
Horizontal Coordinate System Definition
Planar
Map Projection
Map Projection Name
Lambert Conformal Conic
Lambert Conformal Conic
Standard Parallel
41.716667
Standard Parallel
42.683333
Longitude of Central Meridian
-71.500000
Latitude of Projection Origin
41.000000
False Easting
656166.666667
False Northing
2460625.000000
Planar Coordinate Information
Planar Coordinate Encoding Method
row and column
Coordinate Representation
Abscissa Resolution
0.309324
Ordinate Resolution
0.385451
Planar Distance Units
survey feet
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
Entity and Attribute Information
Entity and Attribute Overview
The indexes reference a color palette of RGB values from 0 through 255, representing the color value from the original paper sheet map. The colors on that sheet represent building footprints and features, property boundaries, transportation features (roads, railroads, tracks and trails), drainage, map annotations, and more. The colors and symbols are explained in a key on the index page of the source atlas. A citation and URL to a digital version of the source atlas including the index page with key is provided in the cross reference section. See: http://nrs.harvard.edu/urn-3:FHCL:9988221 The digital version of the atlas also includes a graphic and street index.
Entity and Attribute Detail Citation
Not applicable.
Distribution Information
Format Name
GeoTIFF
Distributor
Harvard Library
Online Access
http://hgl.harvard.edu/
Name
Metadata Reference Information
Metadata Date
20130401
Metadata Contact
Contact Information
Contact Organization Primary
Contact Organization
Harvard Geospatial Library
Contact Position
Geospatial Resources Cataloger
Contact Address
Address
Harvard University Information Technology
Address
Library Technology Services
Address
90 Mount Auburn Street
City
Cambridge
State or Province
MA
Postal Code
02138
Country
USA
Contact Voice Telephone
617-495-2417
Contact Facsimile Telephone
617-496-0440
Contact Electronic Mail Address
hgl_ref@hulmail.harvard.edu
Hours of Service
Monday - Friday, 9:00 am - 4:00 pm EST-USA
Metadata Standard Name
FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version
FGDC-STD-001-1998
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