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Boston, Massachusetts, 2-Dimensional Building Footprints with Height Data (from LIDAR data), 2002
- Identification Information
- Data Quality Information
- Spatial Data Organization Information
- Spatial Reference Information
- Entity and Attribute Information
- Distribution Information
- Metadata Reference Information
- Identification Information
- Citation
- Originator
- 3Di Technologies, Inc.(Now Spectrum Mapping LLC)
- Originator
- MassGIS (Office : Mass.)
- Publication Date
- 20041122
- Title
- Boston, Massachusetts, 2-Dimensional Building Footprints with Height Data (from LIDAR data), 2002
- Geospatial Data Presentation Form
- vector digital data
- Publication Information
- Publication Place
- Boston, Mass.
- Publisher
- Office of Geographic and Environmental Information (MassGIS)
- Online Linkage
- https://hgl.harvard.edu/catalog/harvard-massgis-bldgs
- Abstract
- This dataset consists of 2D footprints of the buildings in the metropolitan Boston area, based on tiles in the orthoimage index (orthophoto quad ID: 229890, 229894, 229898, 229902, 233886, 233890, 233894, 233898, 233902, 237890, 237894, 237898, 237902, 241890, 241894, 241898, 241902, 245898, 245902). This data set was collected using 3Di's Digital Airborne Topographic Imaging System II (DATIS II). Roof height and footprint elevation attributes (derived from 1-meter resolution LIDAR (LIght Detection And Ranging) data) are included as part of each building feature. This data can be combined with other datasets to create 3D representations of buildings and the surrounding environment.
- Purpose
- The data was collected for MassGIS to be used for a variety of purposes including emergency response planning, hydrologic / floodplain modeling, assessment of natural hazards, and impervious surface delineation.
- Temporal Extent
- Currentness Reference
- ground condition
- Time Period
- Beginning
- 20020407
- End
- 20020625
- Bounding Box
- West
- -71.197465
- East
- -70.953492
- North
- 42.404600
- South
- 42.223068
- Theme Keyword
- Buildings
- Roofs
- Theme Keyword Thesaurus
- LCSH
- ISO Topic Category
- structure
- planningCadastre
- Theme Keyword
- lidar
- light detection and ranging
- DATIS
- Digital Airborne Topographical Imaging System
- GPS
- building footprint
- Theme Keyword Thesaurus
- None
- Place Keyword
- Massachusetts
- Boston
- Arlington
- Belmont
- Brookline
- Cambridge
- Chelsea
- Dedham
- Everett
- Medford
- Milton
- Newton
- Quincy
- Revere
- Somerville
- Waltham
- Watertown
- Winthrop
- Place Keyword Thesaurus
- GNIS
- Temporal Keyword
- Access Restrictions
- All materials, software, maps, studies, reports, and other products or data, regardless of physical form or characteristics, produced in furtherance of the Contract and funded, in whole or part, under the Contract shall be considered in the public domain and available to Executive Office of Environmental Affairs (EOEA) or its agencies at the reasonable cost of reproduction in any of the formats in which it is stored or maintained. The contractor shall not obtain, attempt to obtain or file for a patent, copyright, trademark or any other intrest in any such materials, software, maps, reports, and other products or data without the express, written consent of the EOEA and subject to any other approvals required by state and federal law.
- Use Restrictions
- All materials, software, maps, studies, reports, and other products or data, regardless of physical form or characteristics, produced in furtherance of the Contract and funded, in whole or part, under the Contract shall be considered in the public domain and available to Executive Office of Environmental Affairs (EOEA) or its agencies at the reasonable cost of reproduction in any of the formats in which it is stored or maintained. The contractor shall not obtain, attempt to obtain or file for a patent, copyright, trademark or any other intrest in any such materials, software, maps, reports, and other products or data without the express, written consent of the EOEA and subject to any other approvals required by state and federal law.
- Status
- Complete
- Maintenance and Update Frequency
- None planned
- Point of Contact
- Contact Organization
- EOEA - MassGIS
- Delivery Point
- 251 Causeway Street
- Delivery Point
- Suite 500
- City
- Boston
- State
- MA
- Postal Code
- 02114
- Country
- USA
- Contact Telephone
- (617) 626-1238
- Contact Facsimile Telephone
- (617) 626-1249
- Contact Electronic Mail Address
- Philip.John@state.ma.us
- Hours of Service
- 9 AM - 5 PM
- Native Data Set Environment
- Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.535
- Data Quality Information
- Logical Consistency Report
- Not Applicable
- Completeness Report
- Not Applicable
- Horizontal Positional Accuracy Report
- The 3Di DATIS LIDAR system used multiple layers of system calibration to ensure horizontal accuracy. The initial instrument calibration was accomplished during the system fabrication. All critical components (IMU, LIDAR, Camera, and Scanner) were optically aligned to a common optical bench using NIST traceable optical collimators and optical flats. This alignment was initially carried out to 2 arc seconds. In addition to the optical bench calibration, the LIDAR system was operated against a series of known targets to determine both scale factor and bias accuracy. All system timing was derived from GPS. For aircraft installation the critical factor was location of the GPS antenna with respect to the DATIS optical reference. This was accomplished through a differential GPS survey. After installation in the aircraft, the system was then flown against a ground test range that was developed using differential GPS points from both static survey and a drive survey. This range provides several thousand points that were used to statistically verify the in flight calibration. Highest grade GPS equiptment was used to help ensure the horizontal accuracy. When flight conditions were acceptable and the predicted GPS PDOP (Position Dilution of Precision) factor was below 3.0 (with at least 5 GPS satellites and 6 desired) for the duration of the planned flight mission, the data acquisition mission was undertaken. The criteria for suitable flight conditions are clear visibility up to 2,000 m (6,560 ft. AGL (Above Ground Level)), calm to relatively low and steady wind speed with no icing conditions. Prior to takeoff the DATIS system IMU (Inertial Measurement Unit) was initialized on the ground for about 15 minutes. The plane (Cessna 206) then took off from Lawrence Municipal Airport, climbed to an altitude of 2,000 m and ferried to the project site. The DATIS system recorded data from the duration of the entire four hour mission and all laser, IMU, and GPS data were recorded onto 8mm tape cartridge. The field crew extracted all flight data from tape, downloaded the GPS receivers, post processed the GPS data, pre-processed the LIDAR data, and screened the collected flight data. This procedure was used to determine whether any area needed to be reflown the following day due to data gaps between flight lines or low quality GPS data. After all flight lines had been quality checked, the data was backed up onto 8mm cartridge tape and sent to 3Di's office in Boulder, Colorado, for post-processing and product generation.
- Quantitative Horizontal Positional Accuracy Assessment
- Lineage
- Source
- Originator
- MassGIS (Office : Mass.)
- Originator
- 3Di Technologies, Inc.
- Publication Date
- Unpublished Material
- Title
- Boston, Massachusetts Region LIDAR First Return Elevation Data, 2002
- Geospatial Data Presentation Form
- map
- Publication Information
- Publication Place
- Boston, Mass.
- Publisher
- Office of Geographic and Environmental Information (MassGIS)
- Online Linkage
- http://hgl.harvard.edu
- Type of Source Media
- online
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 2002
- Source Currentness Reference
- ground condition
- Contribution
- Source data set
- 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
- 161330
- Spatial Reference Information
- Horizontal Coordinate System Definition
- Planar
- Grid Coordinate System
- Grid Coordinate System Name
- State Plane Coordinate System
- State Plane Coordinate System
- SPCS Zone Identifier
- 2001
- Lambert Conformal Conic
- Planar Coordinate Information
- Planar Coordinate Encoding Method
- coordinate pair
- Coordinate Representation
- Abscissa Resolution
- 0.000010
- Ordinate Resolution
- 0.000010
- Planar Distance Units
- meters
- 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 Type
- Entity Type Label
- MASSGIS_BLDGS
- Entity Type Definition
- 2-Dimensional Building Footprints (from LIDAR data)
- Entity Type Definition Source
- MassGIS
- Attributes
- OBJECTID
- Internal feature number. (Sequential unique whole numbers that are automatically generated.)
- Definition Source
- ESRI
- GRID
- The name of the 4k tile, named by the lower-right corner of the grid in State Plane (Massachusetts Mainland), NAD83, meters
- Definition Source
- MassGIS
- ID
- Each sub-polygon that makes up a building has a common "ID" field
- Definition Source
- MassGIS
- MASSGIS_BLDGS.AREA
- PERIMETER
- Perimeter of the polygon in meters
- Definition Source
- MassGIS
- RMSE
- The root-mean-squared error of the LIDAR points away from the coputed roof height. Units are in meters .
- Definition Source
- MassGIS
- ROOF
- The elevation of the roof. Units are in meters, NAVD88, Geoid99
- Definition Source
- MassGIS
- GND
- Computed by matching the polygon to the bare earth surface, forming the height of the base of each building. Units are in meters, NAVD88, Geoid99
- Definition Source
- MassGIS
- ROOF_FT
- HEIGHT
- AREA_1
- LEN
- SHAPE
- Feature geometry. (Coordinates defining the features.)
- Definition Source
- ESRI
- SHAPE.AREA
- Area of feature in square coverage units
- Definition Source
- ESRI
- SHAPE.LEN
- Length of arc in coverage units
- Definition Source
- ESRI
- Distribution Information
- Format Name
- Shapefile
- Distributor
- Harvard Geospatial Library
- Online Access
- http://hgl.harvard.edu
- Name
- Metadata Reference Information
- Metadata Date
- 20080926
- Metadata Contact
- Contact Information
- Contact Organization Primary
- Contact Organization
- Harvard Geospatial Library
- Contact Position
- Geospatial Resources Cataloger
- Contact Address
- Address
- Harvard University Library
- Address
- Office For Information Systems
- 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
