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Aerial Photography Archive
Archive Home | Staff & Facilities | Examples | Prices BLM’s National Science and Technology Center (NSTC) in Denver is the primary repository for the agency’s collection of aerial film. The many rolls of B&W, Natural Color and False Color Infrared photography represent an inventory numbering in the hundreds of thousands of images. Numerous locales within the western United States - mostly adjacent to or within tracts of BLM managed land - are included in the Bureau’s coverage. This ever-growing collection of images represents snapshots in time that could be fairly recent or historically priceless. Reproductions from this original photography are available to prospective customers in a variety of formats (including digital), through the expertise of professional private vendors. In addition to the standard print reproduction, staff can provide guidance and assistance in securing just about any type of customized reproduction tailored to best serve the needs of any given project. Not exclusive to BLM, the customers of the archive cover a broad spectrum of public and private interests as well as other Federal, State and Local governments. |
NSTC's Aerial Photography Archive contains over 451,000 frames of original large-format (9- x 9- inch) aerial photograph roll film. This photography spans over twenty-five years. The majority of projects are at a scale of 1:24,000, however there are some holdings at a scale of 1:12,000 available for Western Oregon and Northern California. Special purpose, large scale coverage also exists for project areas scattered across lands managed by BLM. Film types included in the archives are black and white (B&W), natural color, and false color infrared.
Click on the image to see a LARGE map of Coverage |
B & W Negative Films Prior to 1970, all of BLM’s aerial photography projects were flown with B&W negative film. This general purpose coverage will yield B&W paper print or film products suitable for a wide variety of uses relating to surface mapping and/or interpretation. With the absence of color, certain limitations for it’s utilization can be expected. However, the historical data contained within the B&W film portion of the archive is proving to be invaluable for change detection studies conducted in a variety of disciplines. Natural Color Negative Films The largest portion of BLM’s aerial photography coverage exists as natural color negative film. This original film, once exposed and developed, is in “complimentary� negative form. When reproduced through conventional means as either a paper or film product, the resultant reversed or “positive� image appears just as the human eye would perceive it, a natural color scene. Photo interpretation applications for this daylight exposure film are almost endless. False Color Infrared Films These films comprise a much smaller portion of BLM’s film archive. Due to the unique characteristics of this film, false color infrared is preferred for vegetative and hydrologic studies. False color infrared film is sensitive to ultraviolet, visible and infrared radiation to approximately 900 nm. When the film is exposed with a yellow filter, the emulsion layers become sensitive to only green, red and infrared wavelengths. Blue radiation is absorbed by the filter; hence, the greater haze penetration ability of infrared film. The most obvious characteristic of false color infrared films is the distinctive pink to magenta coloring of most live and healthy vegetation (exclusive of many conifer species). Almost all surface features distinguishable with B&W or natural color film can also be distinguished with false color infrared reproductions (assuming said features are NOT reliant on “natural� color differentiation as would be the case with some geologic profiling.) This photography does not capture ambient temperature variation as is the case with other types of thermal imaging. |
If you have an interest in ordering reproductions from BLM’s film library, please contact our staff with detailed information on your specific target area. We’ll be happy to research and determine availability of coverage for you given such aides as state, county, nearby cities, and/or geographic coordinates (latitude/longitude or township/range/section numbers). In some cases, we may even need a map to pinpoint small parcels of land or surface features. Once we’ve designated the projects in our library that are pertinent, we can outline the options for product availability, respond to any questions you may have, and finalize any associated costs for products ordered.
All orders will be assessed a $10 shipping and handling fee and must be prepaid. The BLM accepts checks and credit cards.
You can reach us via Phone : (303) 236-6648,
Fax : (303) 236-4810,
or E-Mail : barbara_campbell@blm.gov