This map data layer represents the building footprints for the City of Somerville, Massachusetts. This layer was developed by Camp, Dresser McKee (CDM), derived from Boston Edison Company (BECo.)
Purpose
These data are intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data.
More advanced user applications may focus on urban and regional planning, and associated themes such as economic and demographic analysis. Generally building footprints layers are useful in identifying building structures and to facilitate applications that search by street name and address.
Temporal Extent
Currentness Reference
ground condition
Time Instant
unknown
Bounding Box
West
-71.134362
East
-71.073039
North
42.417517
South
42.373240
ISO Topic Category
planningCadastre
structure
Theme Keyword
Municipal
Theme Keyword Thesaurus
HGL Category Keyword Thesaurus
Theme Keyword
Buildings
Real property
Urban land use
City planning
Theme Keyword Thesaurus
LCSH
Place Keyword
Somerville
Massachusetts
Place Keyword Thesaurus
GNIS
Temporal Keyword
Access Restrictions
Access is granted to licensee (Harvard University) only. Available only to Harvard University affiliates.
Use Restrictions
For educational non-commercial use only. The City of Somerville makes no claims, no representations, and no warranties, express or implied, concerning the validity (express or implied), the reliability or the accuracy of the GIS data and GIS data products furnished by the City, including the implied validity of any uses of such data
Status
Complete
Maintenance and Update Frequency
Unknown
Point of Contact
Contact Organization
Assessing Department, City of Somerville
Delivery Point
City Hall
Delivery Point
93 Highland Avenue
City
Somerville
State
MA
Postal Code
02143
Country
USA
Contact Telephone
625-6600 x3106
Contact Electronic Mail Address
sfama@ci.somerville.ma.us
Credit
GIS data supplied by the City of Somerville.
Native Data Set Environment
Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.2.0.700
Data Quality Information
Lineage
Spatial Data Organization Information
Direct Spatial Reference Method
Vector
Point and Vector Object Information
SDTS Terms Description
SDTS Point and Vector Object Type
G-polygon
Point and Vector Object Count
15377
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
coordinate pair
Coordinate Representation
Abscissa Resolution
0.000008
Ordinate Resolution
0.000008
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
Vertical Coordinate System Definition
Altitude System Definition
Altitude Resolution
1.000000
Altitude Encoding Method
Explicit elevation coordinate included with horizontal coordinates
