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Boston, Massachusetts Region, Digital Elevation Model with Bathymetry
- 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
- MassGIS (Office : Mass.)
- Originator
- United States. National Oceanic and Atmospheric Administration
- Originator
- Harvard University. Graduate School of Design.
- Publication Date
- 2009
- Title
- Boston, Massachusetts Region, Digital Elevation Model with Bathymetry
- Geospatial Data Presentation Form
- SDE raster digital data
- Publication Information
- Publication Place
- Cambridge, Mass.
- Publisher
- Harvard Map Collection, Harvard College Library
- Online Linkage
- https://hgl.harvard.edu/catalog/harvard-bos-dem-bath
- Abstract
- This raster layer represents surface elevation and bathymetry data for the Boston Region, Massachusetts. It was created by merging portions of MassGIS Digital Elevation Model 1:5,000 (2005) data with NOAA Estuarine Bathymetric Digital Elevation Models (30 m.) (1998). DEM data was derived from the digital terrain models that were produced as part of the MassGIS 1:5,000 Black and White Digital Orthophoto imagery project. Cellsize is 5 meters by 5 meters. Each cell has a floating point value, in meters, which represents its elevation above or below sea level.
- Purpose
- Planning and surface (terrain) analysis and cartographic display
- Temporal Extent
- Currentness Reference
- source publication dates
- Bounding Box
- West
- -71.205018
- East
- -70.806082
- North
- 42.482320
- South
- 42.229217
- Theme Keyword
- Altitudes
- Oceans
- Bathymetric maps
- Theme Keyword Thesaurus
- LCSH
- ISO Topic Category
- elevation
- oceans
- imageryBaseMapsEarthCover
- Theme Keyword
- digital elevation model
- digital terrain model
- Theme Keyword Thesaurus
- None
- Place Keyword
- Massachusetts
- Boston
- Boston Harbor
- Arlington
- Belmont
- Braintree
- Brookline
- Burlington
- Cambridge
- Chelsea
- Cohasset
- Dedham
- Everett
- Hingham
- Hull
- Lexington
- Lynn
- Malden
- Marblehead
- Medford
- Melrose
- Milton
- Nahant
- Needham
- Newton
- Quincy
- Revere
- Saugus
- Somerville
- Stoneham
- Swampscott
- Wakefield
- Waltham
- Watertown
- Westwood
- Weymouth
- Winchester
- Winthrop
- Woburn
- Place Keyword Thesaurus
- GNIS
- Temporal Keyword
- Access Restrictions
- None
- Use Restrictions
- None
- Status
- Complete
- Maintenance and Update Frequency
- None planned
- Point of Contact
- Contact Person
- Paul Cote
- Delivery Point
- Gund Hall 520
- Delivery Point
- 48 Quincy St
- City
- Cambridge
- State
- MA
- Postal Code
- 02138
- Country
- USA
- Contact Telephone
- 617.496.0546
- Contact Facsimile Telephone
- 617.496.5866
- Contact Electronic Mail Address
- pbcote@gsd.harvard.edu
- Native Data Set Environment
- Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.4.1420
- Data Quality Information
- Attribute Accuracy Report
- Bathymetric data: The accuracy of a DEM is dependent upon the level of detail of the source soundings and the grid spacing used to sample that source. The primary limiting factor for the level of detail of the source is the scale of the source survey, the technology used to collect soundings, and the resolution of the source soundings. Additional complications in describing accuracy are the ages of the surveys used to collect sounding in a given area. Care was used to use the most recent surveys covering a given area but in some instances adjacent surveys may be decades apart in age. In some regions, the only source data were at fathom (6 feet) resolution. In general, most source surveys were certified to one foot or better by the National Ocean Service.
- Logical Consistency Report
- Bathymetric data: The fidelity of the relationships encoded in the data structure of the DEM are automatically verified using a NOAA-NOS software program upon completion of the data production cycle. The test verifies full compliance to the DEM specification.
- Completeness Report
- DEM Covers Boston Region. Bathymetric data : The DEM is visually inspected for completeness on a DEM view and edit system for the purpose of performing a final quality control and if necessary, edit of the DEM. The physical format of each DEM is validated for content completeness and logical consistency during production quality control. Due to the variable orientation of the 7 1/2 minute quadrilateral in relation to the Universal Transverse Mercator (UTM) projection grid, profiles that pass within the bounds of the DEM quadrilateral may be void of elevation grid points and are not represented in the DEM. This condition occurs infrequently and is always the first or last profile of the dataset. DEM's may contain void areas caused by elevations being above Mean High Water or on non-tidal land. Void elevations are assigned the value of -32,767. In addition, suspect elevation areas may exist in the DEM but are not specifically identified. Only available data digitized before 1997 were used in this project. Additional sounding information may exist for areas which have holes in the bathymetric data set, but was not available at the time this project was completed. No additional updates or error corrections are planned for this data set.
- Horizontal Positional Accuracy Report
- DEM data: The source digital terrain model data were collected on analytical stereoplotters at a sufficient density to support generation of 3-meter contours conforming to the National Map Accuracy Standards (+ or - 1.5 meters) at the nominal scale of 1:5,000. Bathymetric data: The horizontal accuracy of the DEM is expressed as an estimated root mean square error (RMSE). The estimate of the RMSE is based upon horizontal accuracy tests of the source soundings used to generate the DEM. As a first approximation the locational accuracy of the source soundings are 0.0015 m at source "Smooth Sheet" scale (120 m @ 1:80,000 to 15 m @ 1:10,000). Smooth Sheets are maps generated as a principle product of each (historic) hydrographic survey with fully corrected soundings plotted on them.
- Lineage
- Source
- Originator
- MassGIS (Office : Mass.)
- Publication Date
- 200304
- Title
- Digital Terrain Model (DTM)
- Geospatial Data Presentation Form
- raster digital data
- Publication Information
- Publication Place
- Boston, Mass.
- Publisher
- Office of Geographic and Environmental Information (MassGIS)
- Source Scale Denominator
- 5000
- Type of Source Media
- online
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 200304
- Source Currentness Reference
- publication date
- Contribution
- Source Digital Terrain Model
- Source
- Originator
- MassGIS (Office : Mass.)
- Publication Date
- 200502
- Title
- Digital Elevation Model (1:5,000)
- Geospatial Data Presentation Form
- raster digital data
- Publication Information
- Publication Place
- Boston, Mass.
- Publisher
- Office of Geographic and Environmental Information (MassGIS)
- Source Scale Denominator
- 5000
- Type of Source Media
- online
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 200502
- Source Currentness Reference
- publication date
- Contribution
- Source of Digital Elevation Model
- Source
- Originator
- United States. National Oceanic and Atmospheric Administration
- Publication Date
- 19980606
- Title
- Estuarine Bathymetric Digital Elevation Models (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA
- Geospatial Data Presentation Form
- raster digital data
- Publication Information
- Publication Place
- Silver Spring, MD
- Publisher
- NOAA's Ocean Service, Special Projects (SP)
- Online Linkage
- http://estuarinebathymetry.noaa.gov
- Type of Source Media
- online
- Source Temporal Extent
- Time Period Information
- Range of Dates/Times
- Beginning Date
- 1839
- Ending Date
- 1989
- Source Currentness Reference
- ground condition
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Raster
- Raster Object Information
- Raster Object Type
- Pixel
- Row Count
- 5585
- Column Count
- 6541
- Vertical Count
- 1
- 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
- row and column
- Coordinate Representation
- Abscissa Resolution
- 5.000000
- Ordinate Resolution
- 5.000000
- 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
- Vertical Coordinate System Definition
- Altitude System Definition
- Altitude Datum Name
- North American Vertical Datum of 1988
- Altitude Resolution
- 0.001
- Altitude Distance Units
- meters
- Altitude Encoding Method
- Explicit elevation coordinate included with horizontal coordinates
- Entity and Attribute Information
- Entity Type
- Entity Type Label
- BOS_DEM_BATH
- Entity Type Definition
- Boston, Massachusetts Region, Digital Elevation Model with Bathymetry
- Entity Type Definition Source
- Harvard Geospatial Library
- Entity and Attribute Overview
- Each cell has an integer value, in meters, which represents its elevation above or below sea level.
- Entity and Attribute Detail Citation
- Not applicable.
- Distribution Information
- Format Name
- SDE Raster
- Distributor
- Harvard Geospatial Library
- Online Access
- http://hgl.harvard.edu
- Name
- Metadata Reference Information
- Metadata Date
- 20090203
- 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
