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FAQs
 
  1. What can GPR see?
  2. Where does GPR work?
  3. How does GPR work?
  4. Why use GPR?
  5. What are the pitfalls of GPR?
  1. What can GPR see?

    Find buried evidence including: weapons, caches of drugs or money, clandestine graves, hidden bunkers, soil disturbances.

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  2. Where does GPR work?
    GPR works for both urban and rural environments. See through soil, asphalt, pavement, concrete, and walls.



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  3. How does GPR work?
    Ground Penetrating Radar (GPR) is the general term applied to techniques which employ radio waves, typically in the 1 to 1000 MHz frequency range, to map structures and features buried in the ground (or in man-made structures).
    • acronym for Ground Penetrating Radar
    • ground can be soil, rock, concrete, wood - anything non-metallic
    • emits a pulse into the ground
    • records echoes
    • builds an image from the echoes


    GPR Image Creation



    As the above animation illustrates, point targets shows as inverted Vs in the GPR data. The apex of the hyperbolas indicate the location and depth of the utility.Back to top
  4. Why use GPR?

    GPR detects areas of disturbed soil and non-metallic objects that are nearly undetectable using other subsurface investigation tools.

    The table below shows how GPR complements the most used subsurface investigation tools:

    Investigated features GPR Metal
    Detectors
    EM Magnetometers Manual
    Excavation
    Buried bodies x       x
    Guns & Knives x x x x x
    Buried caches of
    drugs or money
    x       x
    Explosives x        
    Disturbed soil x        
    Land marks
    (foundations)
    x     x x
    Tunnels and
    chambers
    x     x x



    The portability and flexibility of the equipment, as well as the real time visualization, offers an excellent solution for various applications, where other methods may fail.

    GPR can assist law enforcement and crime scene investigators in locating evidence behind brick or concrete walls, wooden floors or in hidden compartments.

    GPR can provide powerful insight to forensics specialists conducting detailed subsurface site investigations. GPR locates bodies, buried caches, weapons or tunnels. Ground penetrating radar can aid in ruling out suspect areas in minutes.

    GPR is a strong investigative tool. The common sense approach for an investigating group is to use all of the tools available. Understanding where and when a particular approach is most cost-effective comes from experience.


    Expand your investigation capabilities

    Find buried evidence including:
    • weapons
    • caches of drugs or money
    • clandestine graves
    • hidden bunkers
    • soli distrurbances
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  5. What are the pitfalls of GPR?
    GPR is not without its limitations. GPR radiowave signals are absorbed by the ground, with some soils (clays, saline) greatly limiting exploration depth. GPR effectiveness is thus site-specific and varies greatly from place to place. GPR can also get responses from rocks, tree roots, and many other objects as well as soil change - which can make identification of the desired target difficult. (i.e. can't see a tree in the middle of the forest!).Back to top
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