View Metadata
Boston, Massachusetts Region 1:5,000 Color Ortho Imagery (1/2-meter Resolution), 2001
- 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.)
- Publication Date
- 200104
- Title
- Boston, Massachusetts Region 1:5,000 Color Ortho Imagery (1/2-meter Resolution), 2001
- Geospatial Data Presentation Form
- raster 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-half-mtr-ortho
- Abstract
- 1/2-meter resolution 1:5,000 orthophoto image of the Boston region from April 2001. This datalayer is a subset (covering only the Boston region) of the Massachusetts statewide orthophoto image series available from MassGIS. It consists of 23 orthophoto quads mosaicked together (MassGIS orthophoto quad ID: 229890, 229894, 229898, 229902, 233886, 233890, 233894, 233898, 233902, 233906, 233910, 237890, 237894, 237898, 237902, 237906, 237910, 241890, 241894, 241898, 241902, 245898, 245902). These medium resolution true color images are considered the new "basemap" for the Commonwealth by MassGIS and the Executive Office of Environmental Affairs (EOEA). MassGIS/EOEA and the Massachusetts Highway Department jointly funded the project. The photography for the mainland was captured in April 2001 when deciduous trees were mostly bare and the ground was generally free of snow. The geographic extent of this dataset is the same as that of the MassGIS dataset: Boston, Massachusetts Region LIDAR First Return Elevation Data, 2002 [see cross references].
- Purpose
- Planning and analysis, general mapping and display.
- Temporal Extent
- Currentness Reference
- publication date
- Time Instant
- 200104
- Bounding Box
- West
- -71.197177
- East
- -70.952747
- North
- 42.476133
- South
- 42.223162
- Theme Keyword
- Maps
- Orthophotography
- Theme Keyword Thesaurus
- LCSH
- ISO Topic Category
- imageryBaseMapsEarthCover
- Theme Keyword
- image
- ortho
- raster
- orthophoto
- color
- Massachusetts
- aerial photography
- Theme Keyword Thesaurus
- None
- Place Keyword
- Massachusetts
- Boston
- Arlington
- Belmont
- Brookline
- Cambridge
- Canton
- Chelsea
- Dedham
- Everett
- Malden
- Medford
- Melrose
- Milton
- Needham
- Newton
- Quincy
- Somerville
- Stoneham
- Wakefield
- Watertown
- 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 Organization
- EOEA - MassGIS
- Delivery Point
- 251 Causeway Street
- Delivery Point
- Suite 500
- City
- Boston
- State
- MA
- Postal Code
- 02114
- Country
- USA
- Contact Telephone
- (617) 626-1000
- Contact Facsimile Telephone
- (617) 626-1249
- Contact Electronic Mail Address
- michael.trust@state.ma.us
- Hours of Service
- 9 AM - 5 PM
- Native Data Set Environment
- Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350
- Cross-Reference
- 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
- Data Quality Information
- Logical Consistency Report
- Unknown
- Completeness Report
- None
- Horizontal Positional Accuracy Report
- Horizontal control (referenced to NAD83) conforms to the Federal Geodetic Control Committee specifications for Second Order Class 2 GPS surveys. The images meet or exceed the National Map Accuracy Standards to the extent that 90% of the well defined features fall within 0.5mm of their true position on the ground at the nominal output scale of 1:5,000 (2.5m on the ground). Additionally, the maximum displacement of well defined features is less than 5 meters. BSC Group fulfilled land survey requirements by performing highly precise ground control survey independent verification and validation of spatial accuracy.
- Lineage
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Raster
- Raster Object Information
- Raster Object Type
- Pixel
- Row Count
- 56000
- Column Count
- 40000
- 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
- 0.500000
- Ordinate Resolution
- 0.500000
- 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_HALF_MTR_ORTHO
- Entity Type Definition
- 1:5,000 Color Ortho Imagery
- Entity Type Definition Source
- MassGIS
- Entity and Attribute Overview
- Each pixel is coded with three 8-bit values representing the amounts of Red, Green, and Blue in the pixel. This produces a 24-bit RGB image. 8-bit (values ranging 0-255) Red, Green, and Blue values are packed into a single 24-bit identity. This allows for a maximum of 16,777,216 unique combinations of colors. The colors in the image can represent ground features such as drainage, vegetation, cultural features, coastal hydrography, transportation features (roads, railroads, tracks and trails) and more. Each pixel represents approximately 0.5 meters ground resolution.
- 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
- 20080925
- 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@gentoo.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
