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  2. OpenDroneMap - Wikipedia

    en.wikipedia.org/wiki/OpenDroneMap

    OpenDroneMap is an open source photogrammetry toolkit to process aerial imagery (usually from a drone) into maps and 3D models. [3] [4] [5] The software is hosted and distributed freely on GitHub. [6] OpenDroneMap has been integrated within American Red Cross's in-field Portable OpenStreetMap system. [7]

  3. Aerial survey - Wikipedia

    en.wikipedia.org/wiki/Aerial_survey

    Aerial survey is a method of collecting geomatics or other imagery data using airplanes, helicopters, UAVs, balloons, or other aerial methods. Typical data collected includes aerial photography , Lidar , remote sensing (using various visible and invisible bands of the electromagnetic spectrum , such as infrared , gamma , or ultraviolet ) and ...

  4. Sudbury River - Wikipedia

    en.wikipedia.org/wiki/Sudbury_River

    The Sudbury River is a 32.7-mile-long (52.6 km) tributary of the Concord River in Middlesex County, Massachusetts, in the United States. [1]Originating in the Cedar Swamp in Westborough, Massachusetts, near the boundary with Hopkinton, the Sudbury River meanders generally northeast, through Fairhaven Bay, and to its confluence with the Assabet River at Egg Rock in Concord, Massachusetts, to ...

  5. File:Sudbury Town Hall, Sudbury MA.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Sudbury_Town_Hall...

    English: Sudbury Town Hall, Sudbury Massachusetts This is an image of a place or building that is listed on the National Register of Historic Places in the United States of America . Its reference number is 76000277 .

  6. Sudbury Aqueduct - Wikipedia

    en.wikipedia.org/wiki/Sudbury_Aqueduct

    The Sudbury Aqueduct was constructed between 1875 and 1878, and was in use for almost 100 years. It was designed to carry water from the watershed of the Sudbury River to Boston and its surrounding communities.

  7. Photometric system - Wikipedia

    en.wikipedia.org/wiki/Photometric_system

    The sensitivity usually depends on the optical system, detectors and filters used. For each photometric system a set of primary standard stars is provided. A commonly adopted standardized photometric system is the Johnson-Morgan or UBV photometric system (1953). At present, there are more than 200 photometric systems. [citation needed]

  8. 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.

  9. Sloan Digital Sky Survey - Wikipedia

    en.wikipedia.org/wiki/Sloan_Digital_Sky_Survey

    It increased the number of stars observed at high spectroscopic resolution (R ≈ 20,000 at λ ≈ 1.6 μm) and high signal-to-noise ratio (100∶1) by more than a factor of 100. [24] The high-resolution spectra revealed the abundances of about 15 elements, giving information on the composition of the gas clouds the red giants formed from.