11/5/2022 0 Comments Aerial photograph abandoned castleAn image with a scale of 1:8,000 would cover a smaller area on the ground with the landscape details appearing larger than an image with a scale of 1:24,000. An image with a scale of 1:24,000 means that one inch in the photo is equivalent to 24,000 inches on the ground. The scale of the image is the ratio of the distance on the image compared to the equivalent distance on the ground. AERIAL PHOTOGRAPH ABANDONED CASTLE FULLThe medium and high resolution scanned images are captured as they appear on film and are representative of the full tonal range of the original film source. CIR photography utilizes high speed film that is subject to degradation prior to processing, which can create an overall blue cast to the image. Vegetation is distinctly red to magenta in color infrared images because vegetation is highly reflective in the near-infrared portion of the spectrum. Color photography is a valuable image interpretation tool with a wide range of applications since the imagery is a close visual reproduction of the original scene.Ĭolor infrared (CIR), or false color film, is sensitive to green and red in the visible portion of spectrum of light and extends into the near-infrared region of the spectrum. Vegetation appears white to light gray in black-and-white infrared images.Ĭolor film is sensitive to blue, green, and red in the visible region of the electromagnetic spectrum of light and has the appearance of natural color. Near-infrared wavelengths differentiate various types of vegetation, penetrate atmospheric haze, and show good contrast between land and water. This is the most widely used type of film in the USGS EROS film archive.īlack-and-white infrared (BIR) film is sensitive to the visible portion of the spectrum of light and extends into the near-infrared region of the spectrum. This USGS EROS film collection spans decades and includes a wide variety of films with different sensitivity, resolving power, granularity, and sharpness characteristics.īlack-and-white (BW) panchromatic film is sensitive to the full visible portion of the electromagnetic spectrum of light and captures images in tones of gray ranging from black to white. Single Frame Records include black-and-white, black-and-white infrared, natural color, and color infrared images. *The Alaska High-Altitude Photography Program was flown by these two organizations.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |