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    Question about Camera's range

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    nemrod
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    Question about Camera's range

    Post  nemrod on Thu Mar 12, 2015 10:31 am

    If you have camera I mean russian army, how much the max distance to covert an area ?

    For example if a drone is above batlefield, with a camera, this drone could warn russian army about incoming attack. How much km ? 100 KM ? 200 KM ? Less ?
    Satelites have resolution and range maybe several hundreds km ? Could a drone with camera replace satelite ?


    Werewolf
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    Re: Question about Camera's range

    Post  Werewolf on Thu Mar 12, 2015 11:24 am

    nemrod wrote:If you have camera I mean russian army, how much the max distance to covert an area ?

    For example if a drone is above batlefield, with a camera, this drone could warn russian army about incoming attack. How much km ? 100 KM ? 200 KM ? Less ?
    Satelites have resolution and range maybe several hundreds km ? Could a drone with camera replace satelite ?


    Drones with cameras are limited to size of their cameras and the altitude which means bound to earth's curvature, most common drones have range of up to 26km not hundreds, that is physically not possible, not to mention the clouds would block range and only satellites can see hundreds of km's they have the altitude.

    ahmedfire
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    Re: Question about Camera's range

    Post  ahmedfire on Thu Mar 12, 2015 1:36 pm

    Camera over there in the space has a huge lens on it and use CCD to convert light into electrons .
    It's resolution is high, 16 inch or more and may capture images outside of the typical visual spectrum.

    GarryB
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    Re: Question about Camera's range

    Post  GarryB on Fri Mar 13, 2015 1:37 am

    Actually some cameras have very long range, but the problem with very long range is high magnification which limits field of view so you end up having to scan a large area with a high mag lens it ends up like looking though a straw to find things.

    Very high altitude UAVs need high power cameras just to see the ground clearly... a drone flying at 15km altitude needs a camera that can see enormous distances... a target 20km away from the drone horizontally... well Pythagoras theorem says you can calculate the longest edge of a right angle triangle by squaring the other two sides and adding them together and square rooting the result... so 15 x 15 plus 20 x 20 equals 225 + 400 which equals 625 so the square root is 25, so to see 20km away from 15km altitude the camera has to be able to see at least 25km.

    A while back I was looking through Various Russian optics websites I found one website that specialised in very high resolution very high magnification optics.

    The example on their front page showed a city landscape photo that zoomed in multiple times to the point where buildings that were 20km away could be zoomed in so the image showed individual rooms on a building...

    It really annoys me that I don't seem to be able to find it again.... Sad


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