Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Ground-penetrating_radar> ?p ?o }
- Ground-penetrating_radar abstract "Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures. GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements and structures. In the right conditions, practitioners can use GPR to detect subsurface objects, changes in material properties, and voids and cracks.GPR uses high-frequency (usually polarized) radio waves, usually in the range 10 MHz to 1 GHz. A GPR transmitter emits electromagnetic energy into the ground. When the energy encounters a buried object or a boundary between materials having different permittivities, it may be reflected or refracted or scattered back to the surface. A receiving antenna can then record the variations in the return signal. The principles involved are similar to seismology, except GPR methods implement electromagnetic energy rather than acoustic energy, and energy may be reflected at boundaries where subsurface electrical properties change rather than subsurface mechanical properties as is the case with seismic energy. The electrical conductivity of the ground, the transmitted center frequency, and the radiated power all may limit the effective depth range of GPR investigation. Increases in electrical conductivity attenuate the introduced electromagnetic wave, and thus the penetration depth decreases. Because of frequency-dependent attenuation mechanisms, higher frequencies do not penetrate as far as lower frequencies. However, higher frequencies may provide improved resolution. Thus operating frequency is always a trade-off between resolution and penetration. Optimal depth of subsurface penetration is achieved in ice where the depth of penetration can achieve several thousand metres (to bedrock in Greenland) at low GPR frequencies. Dry sandy soils or massive dry materials such as granite, limestone, and concrete tend to be resistive rather than conductive, and the depth of penetration could be up to 15-metre (49 ft). In moist and/or clay-laden soils and materials with high electrical conductivity, penetration may be as little as a few centimetres.Ground-penetrating radar antennas are generally in contact with the ground for the strongest signal strength; however, GPR air-launched antennas can be used above the ground.Cross borehole GPR has developed within the field of hydrogeophysics to be a valuable means of assessing the presence and amount of soil water.".
- Ground-penetrating_radar thumbnail LINE21.jpg?width=300.
- Ground-penetrating_radar wikiPageExternalLink resolver.pl?urn=urn%3Anbn%3Ade%3Ahbz%3A468-20080382.
- Ground-penetrating_radar wikiPageExternalLink BASICS.PDF.
- Ground-penetrating_radar wikiPageExternalLink www.eurogpr.org.
- Ground-penetrating_radar wikiPageExternalLink www.gprmax.com.
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- Ground-penetrating_radar wikiPageWikiLink Acoustics.
- Ground-penetrating_radar wikiPageWikiLink Antenna_(radio).
- Ground-penetrating_radar wikiPageWikiLink Artifact_(archaeology).
- Ground-penetrating_radar wikiPageWikiLink Bedrock.
- Ground-penetrating_radar wikiPageWikiLink Blimp.
- Ground-penetrating_radar wikiPageWikiLink Category:Geophysical_imaging.
- Ground-penetrating_radar wikiPageWikiLink Category:Radar.
- Ground-penetrating_radar wikiPageWikiLink Concrete.
- Ground-penetrating_radar wikiPageWikiLink Continuous-wave_radar.
- Ground-penetrating_radar wikiPageWikiLink Digital_signal_processing.
- Ground-penetrating_radar wikiPageWikiLink ETSI.
- Ground-penetrating_radar wikiPageWikiLink Earth_science.
- Ground-penetrating_radar wikiPageWikiLink Electrical_resistivity_and_conductivity.
- Ground-penetrating_radar wikiPageWikiLink Electromagnetic_radiation.
- Ground-penetrating_radar wikiPageWikiLink Environmental_remediation.
- Ground-penetrating_radar wikiPageWikiLink Feature_(archaeology).
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- Ground-penetrating_radar wikiPageWikiLink Frequency.
- Ground-penetrating_radar wikiPageWikiLink Geophysical_imaging.
- Ground-penetrating_radar wikiPageWikiLink Geophysical_survey_(archaeology).
- Ground-penetrating_radar wikiPageWikiLink Geophysics.
- Ground-penetrating_radar wikiPageWikiLink Granite.
- Ground-penetrating_radar wikiPageWikiLink Groundwater.
- Ground-penetrating_radar wikiPageWikiLink Hydrogeophysics.
- Ground-penetrating_radar wikiPageWikiLink Land_mine.
- Ground-penetrating_radar wikiPageWikiLink Limestone.
- Ground-penetrating_radar wikiPageWikiLink Michael_Sams.
- Ground-penetrating_radar wikiPageWikiLink Microwave.
- Ground-penetrating_radar wikiPageWikiLink Motion_detector.
- Ground-penetrating_radar wikiPageWikiLink Nondestructive_testing.
- Ground-penetrating_radar wikiPageWikiLink Optical_resolution.
- Ground-penetrating_radar wikiPageWikiLink Permittivity.
- Ground-penetrating_radar wikiPageWikiLink Police.
- Ground-penetrating_radar wikiPageWikiLink Radar.
- Ground-penetrating_radar wikiPageWikiLink Radio_spectrum.
- Ground-penetrating_radar wikiPageWikiLink Radioglaciology.
- Ground-penetrating_radar wikiPageWikiLink Seismology.
- Ground-penetrating_radar wikiPageWikiLink Soil.
- Ground-penetrating_radar wikiPageWikiLink Synthetic_aperture_radar.
- Ground-penetrating_radar wikiPageWikiLink Time_Team.
- Ground-penetrating_radar wikiPageWikiLink Tomography.
- Ground-penetrating_radar wikiPageWikiLink Ultra-wideband.
- Ground-penetrating_radar wikiPageWikiLink Ultra_high_frequency.
- Ground-penetrating_radar wikiPageWikiLink Very_high_frequency.
- Ground-penetrating_radar wikiPageWikiLink Wall.
- Ground-penetrating_radar wikiPageWikiLink File:Calvary_depth_slices.jpg.
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- Ground-penetrating_radar wikiPageWikiLinkText "GPR".
- Ground-penetrating_radar wikiPageWikiLinkText "Georadar-Survey".
- Ground-penetrating_radar wikiPageWikiLinkText "Ground Penetrating Radar Survey".
- Ground-penetrating_radar wikiPageWikiLinkText "Ground Penetrating Radar".
- Ground-penetrating_radar wikiPageWikiLinkText "Ground-Penetrating Radar".
- Ground-penetrating_radar wikiPageWikiLinkText "Ground-penetrating radar".
- Ground-penetrating_radar wikiPageWikiLinkText "ability to penetrate soil".
- Ground-penetrating_radar wikiPageWikiLinkText "ground penetrating radar".
- Ground-penetrating_radar wikiPageWikiLinkText "ground radar".
- Ground-penetrating_radar wikiPageWikiLinkText "ground-penetrating radar [GPR]".
- Ground-penetrating_radar wikiPageWikiLinkText "ground-penetrating radar".
- Ground-penetrating_radar wikiPageWikiLinkText "ice-penetrating radar".
- Ground-penetrating_radar wikiPageWikiLinkText "penetrated".
- Ground-penetrating_radar wikiPageWikiLinkText "radar".
- Ground-penetrating_radar wikiPageWikiLinkText "unique ground penetrating radar".
- Ground-penetrating_radar wikiPageUsesTemplate Template:Citation_needed.
- Ground-penetrating_radar wikiPageUsesTemplate Template:Cite_book.
- Ground-penetrating_radar wikiPageUsesTemplate Template:Commons_category.
- Ground-penetrating_radar wikiPageUsesTemplate Template:Convert.
- Ground-penetrating_radar subject Category:Geophysical_imaging.
- Ground-penetrating_radar subject Category:Radar.
- Ground-penetrating_radar hypernym Method.
- Ground-penetrating_radar type Software.
- Ground-penetrating_radar type Geophysic.
- Ground-penetrating_radar type Redirect.
- Ground-penetrating_radar comment "Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures. GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements and structures.".
- Ground-penetrating_radar label "Ground-penetrating radar".
- Ground-penetrating_radar sameAs Q503560.
- Ground-penetrating_radar sameAs رادار_قياس_الأرض.
- Ground-penetrating_radar sameAs Georadar.
- Ground-penetrating_radar sameAs Georadar.
- Ground-penetrating_radar sameAs Bodenradar.
- Ground-penetrating_radar sameAs Georradar.
- Ground-penetrating_radar sameAs Georadar.
- Ground-penetrating_radar sameAs Radar_à_pénétration_de_sol.
- Ground-penetrating_radar sameAs מכ%22ם_חודר_קרקע.
- Ground-penetrating_radar sameAs Földradar.
- Ground-penetrating_radar sameAs Radar_penembus_tanah.