geography

Hirakud Dam

News: Water flow into the Hirakud reservoir on the Mahanadi river decreased by 34% in 2017

7 Sep, 2018

RAVINE LANDFORM

Source: Ravines of Chambal Valley About Ravine: A ravine is a landfo

4 Sep, 2018
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    SPACE LASER STARTS CHASING THE WIND

    News:

    The British-built Aeolus satellite has begun firing its laser down on Earth to map the planet’s winds.
    Details of the mission:

    Details of the mission:

    • Launched two weeks ago from the Kourou spaceport in French Guiana, Aeolus is now undergoing three months of testing.
    • Once this is complete, scientists will start assessing the satellite’s wind data for inclusion in weather models.
    • Its maps are expected to bring significant improvements in the accuracy of medium-range forecasts – those that look a few days ahead.
    • Launched two weeks ago from the Kourou spaceport in French Guiana, Aeolus is now undergoing three months of testing.
    • Once this is complete, scientists will start assessing the satellite’s wind data for inclusion in weather models.
    • Its maps are expected to bring significant improvements in the accuracy of medium-range forecasts – those that look a few days ahead.

    About LiDAR:

    • LiDAR is a surveying method that measures distance to a target by illuminating the target with pulsed laser light and measuring the reflected pulses with a sensor.
    • Differences in laser return times and wavelengths can then be used to make digital 3-D representations of the target.
    • Lidar sometimes is called laser scanning and 3-D scanning, with terrestrial, airborne, and mobile applications.
    • Lidar is commonly used to make high-resolution maps, with applications in geodesy, geomatics, archaeology, geography, geology, geomorphology, seismology , forestry, atmospheric physics, laser guidance, airborne laser swath mapping (ALSM), and laser altimetry.
    • The technology is also used in control and navigation for some autonomous cars.
    • Lidar uses ultraviolet, visible, or near infrared light to image objects.
    • It can target a wide range of materials, including non-metallic objects, rocks, rain, chemical compounds, aerosols, clouds and even single molecules.