1:5,000 Color Ortho ImageryEntry ID: MassGIS_GISDATA.IMG_COQ2001
Abstract: 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.
Purpose: Planning and analysis, general mapping and display.
CURRENTNESS REFERENCE: publication date
SPATIAL DATA ORGANIZATION INFORMATION
Direct Spatial Reference: Raster
SDTS Point and Vector Object Type: G-polygon
Point and Vector Object Count: 44
Raster Object Type: Pixel
Row Count: 376000
Column Count: 600000
Vertical Count: 1
SPATIAL REFERENCE INFORMATION - PLANAR
Grid Coordinate System Name: ... State Plane Coordinate System 1983
SPCS Zone Identifier: 2001
Standard Parallel: 41.716667
Standard Parallel: 42.683333
Longitude of Central Meridian: -71.500000
Latitude of Projection Origin: 41.000000
False Easting: 200000.000000
False Northing: 750000.000000
Planar Coordinate Encoding Method: row and column
Abscissa Resolution: 0.500000
Ordinate Resolution: 0.500000
Planar Distance Units: meters
SPATIAL REFERENCE INFORMATION - 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
NATIVE: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 188.8.131.520
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: EOEA - MassGIS
Dataset Title: 1:5,000 Color Ortho Imagery
Dataset Release Date: 2004-04-01
Data Presentation Form: SDE raster digital dataOnline Resource: Server=env-fp-phoenix; Service=esri_sde; User=gisdata; Version=SDE....
Start Date: 2001-04-01
Vertical Resolution: 1.000000
ISO Topic Category
Quality 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.
VERTICAL POSITIONAL ACCURACY REPORT: Vertical control (referenced to NAVD88) is within 10 cm. It is tied to second order Class II NGRS benchmarks. In addition the latitude, longitude and ellipsoidal heights of continuously operating GPS reference stations were incorporated into the control adjustment. Orthometric heights were directly measured or estimated from GPS derived ellipsoidal heights.
Access Constraints ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: Please see the "PURCHASE AGREEMENT FOR DIGITAL DATA PROVIDED BY THE MASSACHUSETTS EXECUTIVE OFFICE OF ENVIRONMENTAL AFFAIRS", online at http://www.state.ma.us/mgis/puragree.htm.
CUSTOM ORDER PROCESS: Please contact MassGIS with questions regarding alternative methods of receiving data.
Use Constraints USE CONSTRAINTS: None
Technical Prerequisites: MassGIS' data may be used in many standard GIS software products. See each software's vendor for technical prerequisites.
Data Set Progress
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: (617) 626-1195
Fax: (617) 626-1249
Email: michael.trust at state.ma.us
251 Causeway Street Suite 500
Province or State: MA
Postal Code: 02114
Creation and Review Dates
DIF Creation Date: 2007-05-15
Last DIF Revision Date: 2009-03-25