The aerial photos were flown between February and March of 1920. Information on the printing process of the silver gelatin paper prints is unknown. Total number of frames is 194. Frames 087 to 090 were duplicate coverage. The photographs were converted to TIFF images at a resolution of 600 x 600 dpi by the Coastal and Hydraulics Laboratory, Engineer Research and Development Center, United States Army Corps of Engineers.
The scanned 600 dpi TIFF images were downloaded by the NJDEP, Division of Land Use Regulation, Bureau of Tidelands, from the website for the Coastal and Hydraulics Laboratory (http://chl.wes.army.mil/shore) , since changed to http://rsm.usace.army.mil/shore/newjersey/shore1920/nj-1920-faq.html. Images were georeferenced by the Tidelands Bureau either in the original TIFF format or as converted JPEGs. Processing referenced either the 1930s Aerials, 1977 Tidal Wetlands, or the 2002 and 2012 Orthophotography WMS services. Link files were saved and RMS errors recorded for the 179 images included in the dataset (3 were duplicate imagery and 11 in the Sandy Hook area were discontinuous from the main imagery grouping). Link files were saved and RMS errors recorded for all but five of the images (11, 21, 34, 41, and 42). RMS errors recorded during georeferencing ranged from 2.16 to 38.40, with an average of 8.10. Each georeferenced TIFF image was then clipped 300 feet at the perimeter and mosaicked.
Individual files were converted and used to construct a layer in an internal WMS service.
Georeferenced digital images were reprocessed to .sid mg4 format using LizardTech GeoExpress software at compression level 15 to 1, and indexed for an Express Server image service.
Metadata record for service was edited, from source record provided by NJDEP Bureau of Tidelands Managment.
This data set consists of a set of black and white aerial photographs acquired in February to March of 1920. The images cover coastal areas of the Atlantic Ocean Coastline in New Jersey from Cape May to Sea Bright. The photographic prints have been scanned and georeferenced to NAD83 NJ State Plane US Survey feet, to create georeferenced digital files. Each black and white TIFF (Tagged Image File Format) image covers an approximately 8300 by 7000 foot area (approximately two square miles). Each image is cropped and sized differently with a variety of overlap to preserve maximum coverage and clarity of detail. Each pixel in the images will have a gray scale value between 0 (black) and 255 (white). The georeferenced image files are named with a number coordinated to its image number in the original photographic set, which is physically written on each print. For files numbered 147 to 183, each image is approximately 24 megabytes in size. Each image file includes an accompanying ESRI-format "world" file (".tfw" file extension) containing the coordinate information used to display and register the image in ESRI software. All other images are JPEG format, approximately 2500 kilobytes in size. The entire set of 179 images with associated files is approximately 1.4 gigabytes in size.