CT ECO Basic Data Guide

2004 Coastal Color Orthophotography

Example of 2004 Coastal Color Orthophotography


Coastal Connecticut 2004 Color Orthophotography is an aerial survey of 2004, leaf on, true color imagery from the NOAA Coastal Services Center and U.S. Geological Survey for the region encompassed by Connecticut municipalities located along the Long Island Sound coastline. The ground resolution for this imagery is 1.64 feet (0.5 meter) per image pixel.


The 2004 true color orthophotography combines the image characteristics of a photograph with the geometric qualities of a map. This leaf-on, natural color imagery serves a variety of purposes from observing vegetation and crop condition to supporting identification and mapping of habitat areas through photo interpretation. These data have been created as a result of the need for having geospatial data immediately available and easily accessible in order to enhance the capability of the NOAA Coastal Services Center and the U.S. Geological Survey.

Use Limitations

This is leaf on orthophotography, therefore the tree canopy blocks the ground surface from view and creates shadows that also obscure nearby features. Also, the location and shape of features in other GIS data may not exactly match information shown in the 2004 aerial photography primarily due to differences in spatial accuracy and data collection dates. For example, a stream in the 1:24,000-scale Connecticut Hydrography data from CT DEP may not line up exactly with the watercourse shown in the 2004 aerial photography. Their location and shape are bound to be different because information such as hydrography compiled from older 1:24,000-scale USGS topographic quadrangle maps, lacks the spatial accuracy and is less current than the 2004 coastal orthophotography.

Dataset Information

Coverage area for 2004 Coastal Color Orthophotography
  • Status - Orthophotography covers approximately 930 square miles and includes the following municipalities: Branford, Bridgeport, Chester, Clinton, Darien, Deep River, East Haven, East Lyme, Essex, Fairfield, Greenwich, Guilford, Groton, Hamden, Ledyard, Lyme, Madison, Milford, Montville, New Haven, New London, Norwalk, Norwich, North Haven, Old Lyme, Old Saybrook, Orange, Preston, Shelton, Stamford, Stonington, Stratford, West Haven, Waterford, Westbrook, and Westport. Includes all offshore islands within the territorial borders of the State of Connecticut with the exception of Goose Island and Falkner Island (offshore of Branford).
  • Date of Data - September 2004. Depending on the area, photography was captured in 2004 on September 20 or 21.
  • Map Scale and Accuracy - The ground resolution for this imagery is 1.64 feet (0.5 meter) per image pixel.

Additional Documentation

  • GIS Metadata - Contains technical documentation describing the 2004 Coastal Color Orthophotography data and the data sources, process steps, and standards used to collect and store this information in a geographic information system (GIS).


GIS Data Download

  • Coastal Connecticut 2004 Color Orthophotography data is available as a statewide mosaic in File Geodatabase format from DEEP GIS Data.
  • Connect GIS and AutoCAD software to this information online using the Ortho 2004 Coast Color CT ECO Map Service.