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  2. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    Code squawked when entering a secondary surveillance radar (SSR) area from a non-SSR area used as uncontrolled IFR flight squawk code. [1] EASA countries: Code that pilot shall set in the absence of ATS instructions related to code setting, unless when not receiving air traffic services. [12] US

  3. Photometric system - Wikipedia

    en.wikipedia.org/wiki/Photometric_system

    Strömgren photometric system: UKIDSS (WFCAM) Z = 882 nm Y = 1031 nm J = 1248 nm H = 1631 nm K = 2201 nm UKIRT Infrared Deep Sky Survey: Vilnius photometric system U = 345 nm P = 374 nm S = 405 nm Y = 466 nm Z = 516 nm V = 544 nm S = 656 nm Vilnius photometric system: VISTA IRC Z = 0.88 μm Y = 1.02 μm J = 1.25 μm H = 1.65 μm

  4. Photogrammetry - Wikipedia

    en.wikipedia.org/wiki/Photogrammetry

    Low altitude aerial photograph for use in photogrammetry. Location: Three Arch Bay, Laguna Beach, California. Photogrammetry is the science and technology of obtaining reliable information about physical objects and the environment through the process of recording, measuring and interpreting photographic images and patterns of electromagnetic radiant imagery and other phenomena.

  5. Sudbury, Massachusetts - Wikipedia

    en.wikipedia.org/wiki/Sudbury,_Massachusetts

    Sudbury in 1856. According to the United States Census Bureau, the town has a total area of 24.6 square miles (64 km 2), of which 24.4 square miles (63 km 2) is land and 0.3 square miles (0.78 km 2), or 1.06%, is water.

  6. Category:Sudbury, Massachusetts - Wikipedia

    en.wikipedia.org/.../Category:Sudbury,_Massachusetts

    Pages in category "Sudbury, Massachusetts" The following 11 pages are in this category, out of 11 total. ... Code of Conduct; Developers; Statistics; Cookie statement;

  7. Airway beacon - Wikipedia

    en.wikipedia.org/wiki/Airway_beacon

    An aerial lighthouse located in Pansio, Turku, Finland An airway beacon (US) or aerial lighthouse (UK and Europe) was a rotating light assembly mounted atop a tower. These were once used extensively in the United States for visual navigation by airplane pilots along a specified airway corridor .

  8. Photometry (optics) - Wikipedia

    en.wikipedia.org/wiki/Photometry_(optics)

    Photometry is a branch of optics that deals with measuring light in terms of its perceived brightness to the human eye. [1] It is concerned with quantifying the amount of light that is emitted, transmitted, or received by an object or a system.

  9. UBV photometric system - Wikipedia

    en.wikipedia.org/wiki/UBV_photometric_system

    A 13 in (330 mm) telescope and the 82 in (2,100 mm) telescope at McDonald Observatory were used to define the system. [ 1 ] [ 3 ] The filters that Johnson and Morgan used were Corning 9 863 for U and 3 384 for V.