About CRRF Aerial Images
The photos taken by CRRF used film cameras between 1983 and 2004. Most of these have been scanned to produce digital files, first at 2000 dpi resolution from the image (3000 by 2000 pixel file) and later at 4000 dpi, for a roughly 4,000 by 6,000 pixel final product. The third and final group of photos in the collection are digital photos taken with 35 mm equivalent SLR cameras, first with lower resolution, and since 2008, high resolution (12 Megapixel) cameras. The CRRF collection numbers about 200,000 digital photos with more being added all the time.
Most general use vertical aerials of land and reef are flown at 7,500 feet to produce an image with 0.5 m pixel size. Using the aircraft the entire land area of Babeldaob can be photographed in only a few hours. We have attempted to photograph the entirety of Babeldaob once a year since 2000 and have been largely successful. Most of the reefs, such as the perimeter barrier reefs are photographed on a similar schedule, but this is much easier to accomplish since they often have no clouds overhead blocking the view downward. More distant areas that are subject to changes in water clarity, such as Velasco Reef and the northern reef lagoon area, are often photographed, although conditions such as water depth often limit the utility of such images.
In addition to Pat’s extensive collection of aerial photos from the COZY, CRRF also has historic aerial photos scanned from 10 by 10 inch color or black and white prints. Such commercial type aerial photos are typically shot from high altitude, again due to the altitude/area coverage relationship, and have limited resolution. Included in this collection are a number of 1940’s aerial images taken during and shortly after the war. Also for areas of Micronesia, and particularly Palau, there are photos taken during the Trust Territory of the Pacific Island period. Palau also has a large set of “cadastral” prints, used in land surveying, that include shoreline areas along with land areas.