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  2. Utility location - Wikipedia

    en.wikipedia.org/wiki/Utility_location

    Utility locator tool in use with spray marking can for marking location Utility location is the process of identifying and labeling public utility mains that are underground. These mains may include lines for telecommunication , electricity distribution , natural gas , cable television , fiber optics , traffic lights , street lights , storm ...

  3. List of Underground Railroad sites - Wikipedia

    en.wikipedia.org/wiki/List_of_Underground...

    The list of Underground Railroad sites includes abolitionist locations of sanctuary, support, and transport for former slaves in 19th century North America before and during the American Civil War. It also includes sites closely associated with people who worked to achieve personal freedom for all Americans in the movement to end slavery in the ...

  4. Ground-penetrating radar - Wikipedia

    en.wikipedia.org/wiki/Ground-penetrating_radar

    Borehole radars utilizing GPR are used to map the structures from a borehole in underground mining applications. Modern directional borehole radar systems are able to produce three-dimensional images from measurements in a single borehole. [8] One of the other main applications for ground-penetrating radars is for locating underground utilities.

  5. Underground Service Alert - Wikipedia

    en.wikipedia.org/wiki/Underground_Service_Alert

    Underground Service Alert (USA) is a non-profit mutual benefit organization that links the excavation community and the owners of underground lines. Underground Service Alert has two separate call centers for California : Underground Service Alert of Northern California (USA North) and Underground Service Alert of Southern California (USA South ...

  6. MapQuest - Wikipedia

    en.wikipedia.org/wiki/MapQuest

    In 2004, MapQuest, uLocate, Research in Motion and Nextel launched MapQuest Find Me, a buddy-finder service that worked on GPS-enabled mobile phones. MapQuest Find Me let users automatically find their location, access maps and directions and locate nearby points of interest, including airports, hotels, restaurants, banks and ATMs.

  7. List of metro systems - Wikipedia

    en.wikipedia.org/wiki/List_of_metro_systems

    The London Underground first opened as an underground railway in 1863 and its first electrified underground line opened in 1890, [1] making it the world's oldest metro system. [2] The Shanghai Metro is both the world's longest metro network at 896 kilometres (557 mi) and the busiest with the highest annual ridership reaching approximately 2.83 ...

  8. Maps.me - Wikipedia

    en.wikipedia.org/wiki/MAPS.ME

    Maps.me is a mobile app for Android, iOS and BlackBerry that provides offline maps using OpenStreetMap data. It was formerly known as MapsWithMe . In November 2014, it was acquired by Mail.Ru Group and became part of its My.com brand.

  9. Baltimore Metro SubwayLink - Wikipedia

    en.wikipedia.org/wiki/Baltimore_Metro_SubwayLink

    The Baltimore Metro SubwayLink is a rapid transit line serving Baltimore, Maryland, and its northwestern suburbs, operated by the Maryland Transit Administration.The segment in Downtown Baltimore is underground, while most of the line outside the central city is elevated or at surface grade. [2]

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