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| Coastal 2003 Oblique Photography |
Source: CT DEP |
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View Photo Index Map
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Description: Approximately 2500 low-altitude oblique photographs showing the coastal and riverine environments of Connecticut were taken in September and October 2003.
These photographs depict the coastline and its coves, embayments, and minor rivers; off shore islands; the Housatonic River to Derby, the Connecticut River to the Connecticut/Massachusetts border, and the
Thames River to Norwich. The photos also capture small portions of the neighboring states of New York and Rhode Island.
Coastal 2003 Oblique Photography Index is a 1:24,000-scale, point feature-based layer that cartographically represents the locations of the photographs. The index layer was derived from Golbal Positioning
System (GPS) data collected from a helicopter based coastal aerial flight conducted during September and October of 2003. The index layer and the photographs do not represent conditions at any one particular
point in time, nor do the point locations correspond to the horizontal coordinates of where the aircraft was at the time of collection. The point features in this layer have been manually repositioned from
their point of capture (off-shore and/or inland) to along the shoreline to represent the approximate center point within the visual extent of the photographs.
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| Coastal 2005 Color Infrared Photography |
Source: CT DEP |
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View Index Map
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Description:The 2005 Connecticut Coastal Color Infrared Compressed Digital Orthophotography is 1:12,000-scale, orthorectified imagery reduced in size from their original format to be more managable to use and transfer while still retaining nearly all of the image quality. The compressed orthophotography is derived from a set of 1129 individual tide controlled aerial photos taken over six distinct days during June 15 to September 15, 2005.
The geographic extent of the photography includes: * all land areas within one-thousand (1000) feet of Mean High Water (MHW) and within one-thousand (1000) feet of state-regulated tidal wetlands; * an area of at least two-thousand (2000) feet waterward of the immediate shoreline of Long Island Sound in order to clearly depict the interface between the shorelands and coastal waters; * all offshore islands within the territorial borders of the State of Connecticut including Goose Island and Falkner Island (offshore of Branford); Calf Islands and Great Captain Island (offshore of Greenwich); Norwalk Islands (offshore of Norwalk); Thimble Islands (offshore of Branford); Sandy Point (offshore of Stonington); and all islands in the Connecticut part of Fishers Island Sound; and * the main stem of the Connecticut River up to the Massachusetts State line.
Color Infrared photography is recognized as one of the preferred means of collecting remotely sensed natural resource data due to the ways in which different features are visualized. To maximize the quality of the images and their contents, photography also conformed to the following environmental conditions: * photos were only taken during times of no/minimal cloud cover when lighting and weather conditions optimized the color infrared film; * solar altitude was more than thirty (30) degrees; * the ground detail was not obscured by flooding; * the foliage (salt marsh vegetation in particular) was fully developed; * seasonal conditions (summer) favored maximum human use/recreation activities (e.g., boats & temporary docks/structures in water, etc.) * photo times were planned within one (1) hour window before or after a predicted low tide based on National Oceanic & Atmospheric Administration (NOAA) predicted tide tables. (In instances where this window caused conflicts with the general restricted hours, tide coordination times superceded that limitation) * no photography was flown between the hours 1100 and 1300 Eastern Standard Time (EST) to minimize specular reflection.
The individual aerial photos were scanned, orthorectifed, and mosaicked into grid-based system. They were compressed with MrSID, a near lossless image reduction technology at a 10:1 ratio, in line with current industry standards for image cmopression. The geographic extent of each digital orthophoto is equivalent to 3¾ minutes of latitude and longitude, plus a little overlap based on US Geological Survey (USGS) Quarter Quads. Typically USGS Quarter Quads are comprised of four sections per 7½ minute USGS Quadrangle map area - one for the northeast, northwest, southeast, and southwest sections. For this project, since the extent of the area photographed may not cover an entire quarter quad section there are cases where there is either no data for parts of a section or no section at all. Naming conventions follow standard USGS fomat, i.e., Q1234_ne, Q1234_nw, Q1234_se, Q1234_sw, etc. The ground resolution of the imagery is approximately 1 ft per pixel. Data is compiled at 1:12,000 scale. This data is not updated.
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