Ground penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. It can detect objects, changes in material, and voids or cavities underground. GPR works by transmitting electromagnetic pulses into the ground and measuring the time it takes for the pulses to reflect back to a receiver antenna. Different materials and objects underground cause different reflections that appear as hyperbolic patterns in GPR images. GPR systems consist of a transmitter antenna, receiver antenna, control unit and display. The frequency used depends on the desired depth of penetration and resolution needed. GPR has advantages of being non-invasive, fast, and able to provide 3D images of underground structures, but its effectiveness is limited by certain soil or terrain conditions.
The presentation comprises the Gravity Method, It's anomaly, reduction, and its applications. The Gravity method is commonly used in Geology specifically in Geophysics.
This Lecture includes the Resistivity survey, field procedure, application advantage, limitaion, Apparant resistivity, VES (Vertical Electrical Sounding), Resistivity Profiling and IP Survey in brief.
identification of ground water potential zones using gis and remote sensingtp jayamohan
the identification of ground water potential zones using gis and remote sensing.The study is conducted in the Muvattupuzha block.The various parameters used are geology,geomorphology,rainfall,soil type,etc.
Test of Electrical Resistivity Method Described here.Electrical sounding and electrical profile sub method are depicted in this presentation. It Deals with Exploring the Subsoil strata without digging the soil. This is one of the best method using more frequently these days.
Ground Penetrating Radar, also known as GPR, is a tool that is used to find Underground Utilities, Underground Storage Tanks (USTs), and in some cases, Graves. The depth and accuracy are dependent on a number of variables, such as soil density, moisture content, and antenna frequency. We use a 350 MHz antenna, which has the potential to reach depths of up to 35 ft (in perfect situations).
GPR systems work by sending a tiny pulse of energy into a material via an antenna. An integrated computer records the strength and time required for the return of any reflected signals. Subsurface variations will create reflections that are picked up by the system and stored on digital media. These reflections are produced by a variety of material such as geological structure differences and man-made objects like pipes and wire.
The presentation comprises the Gravity Method, It's anomaly, reduction, and its applications. The Gravity method is commonly used in Geology specifically in Geophysics.
This Lecture includes the Resistivity survey, field procedure, application advantage, limitaion, Apparant resistivity, VES (Vertical Electrical Sounding), Resistivity Profiling and IP Survey in brief.
identification of ground water potential zones using gis and remote sensingtp jayamohan
the identification of ground water potential zones using gis and remote sensing.The study is conducted in the Muvattupuzha block.The various parameters used are geology,geomorphology,rainfall,soil type,etc.
Test of Electrical Resistivity Method Described here.Electrical sounding and electrical profile sub method are depicted in this presentation. It Deals with Exploring the Subsoil strata without digging the soil. This is one of the best method using more frequently these days.
Ground Penetrating Radar, also known as GPR, is a tool that is used to find Underground Utilities, Underground Storage Tanks (USTs), and in some cases, Graves. The depth and accuracy are dependent on a number of variables, such as soil density, moisture content, and antenna frequency. We use a 350 MHz antenna, which has the potential to reach depths of up to 35 ft (in perfect situations).
GPR systems work by sending a tiny pulse of energy into a material via an antenna. An integrated computer records the strength and time required for the return of any reflected signals. Subsurface variations will create reflections that are picked up by the system and stored on digital media. These reflections are produced by a variety of material such as geological structure differences and man-made objects like pipes and wire.
Ground Penetrating Radar in CA – How does it workTec
Even we can find out what exactly lies behind our feet beneath the surface. Surprised to know that? Yes, that’s possible with the help of the Ground Penetrating Radar (GPR) in CA.
This mind-boggling technology captures the images beneath the specific surface by using the electromagnetic spectrum (EMS).
Ground Penetrating Radar operates by transmitting high-frequency radio waves pulses down into the ground through an antenna. Ground Penetrating Radar is distinctly able at not only mapping buried structures but also relatively measuring their depth, and supplying an all-important thorough detail.
EpitomeGS is a Ground Penetrating Radar Survey company in India. Our Services are GPR, SUE, Underground Utility, Underground Scanning & Mapping survey in India.
EpitomeGS is a Ground Penetrating Radar Survey company in India. Our Services are GPR, SUE, Underground Utility, Underground Scanning & Mapping survey in India.
Ground Penetrating Radar (GPR) operates by transmitting high-frequency radio waves pulses down into the ground through an antenna. Ground Penetrating Radar is distinctly able at not only mapping buried structures but also relatively measuring their depth, and supplying an all-important thorough detail.
The antenna is moved over the surface to be inspected. The transmitter redirects a diverging beam of energy which is reflected in various underground objects or different contacts between different earth materials.
EpitomeGS is a Ground Penetrating Radar Survey company in India. Our Services are GPR, SUE, Underground Utility, Underground Scanning & Mapping survey in India.
GPR Survey operates by transmitting high-frequency radio waves pulses down into the ground through an antenna.
Ground Penetrating Radar survey is distinctly able at not only mapping buried structures but also relatively measuring
their depth, and supplying an all-important thorough detail.
“Epitome” is recognized for its’ reliability, accuracy and superior quality with a consistent track record in meeting technical requirements on-time and on budget. Our focus is total “Quality Management.”
EpitomeGS is a Ground Penetrating Radar Survey company in India. Our Services are GPR survey, SUE, Underground Utility, Underground Scanning & Mapping survey in India.
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Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
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Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
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Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
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Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
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Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
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Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
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A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
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👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
2. Content
Introduction
What is GPR?
Brief History of GPR
Principles of GPR
* How its works
* Operating Frequency
* Resolution depend on frequency
* How Deep Can It Go?
* Hyperbola
Component of GPR
Advantages/Disadvantages
Conclusion
3. Introduction:-
Today, the advance space technology almost reached on extraterrestrial
(Mars) planet and deep ocean exploration also possible to human using
submarine technologies like sonar, scuba diving etc.
But sill today human have no proper answer what are actually below us?
Using direct investigation like bore wells and mining's can provide information
regarding to underground objects with some depth limitations. But using
electromagnetic waves we can get some 100s of meter information regarding
underground objects.
Ground Penetrating Radar (GPR) is one of those techniques which used
radar waves to exploration of underground surface. It can be helpful to many
mapping application with some extent of depth.
4. What is GPR?
Ground penetrating radar (GPR) is now a well-accepted geophysical
technique. It is a high resolution electromagnetic technique that is designed
primarily to investigate underground surface.
GPR has been developed over the past thirty years for shallow, high
resolution investigations of the subsurface. GPR is a time-dependent
geophysical technique that can provide a 3-D pseudo image of the subsurface,
including the fourth dimension of color, and can also provide accurate depth
estimates for many common subsurface objects. GPR can provide precise
information concerning the nature of buried objects. It produces a continuous
cross-sectional profile or record of subsurface features, without drilling,
probing, or digging.
6. Brief History of GPR-
Foundation for radar systems by Christian Hülsmeyer in 1904
Gotthelf Leimbach and Heinrich Löwy applied for a patent to use radar
technology to locate buried objects with radar technology in 1910
A glacier's depth was measured using ground penetrating radar in 1929
by W. Stern
Military applications began driving research in 1970s
Commercial applications began in 1985
GPR is becoming the new tool in archaeological remote sensing & many
other areas.
The particular invention improved the depth resolution and is still widely
used today.
7. Principles of GPR
How it works ?
Ground Penetrating Radar (GPR) uses the same fundamental physical principles
as conventional radar. It uses radio waves to map structure and features buries in the
ground /man-made structures. The pulses always propagates in a shape of a cone.
The radar technique principally detect back-scattered energy from a target.
GPR uses a high frequency radio signal that is transmitted by the antenna and
travels downward until it hits an object that has different electrical properties from
the surrounding medium then its get scattered from the object and receive by the
receiver antenna and stored on digital media. The computer measures the time taken
for a pulse to travel from the target which indicates its depth and location. The
reflected signals are interpreted by the system and displayed on the unit's LCD panel
in the form of cross-sectional profile .
8. If the wave hits a buried object, then part of the waves energy is
reflected back to the surface, while part of its energy continues to travel
downward. The wave that is reflected back to the surface is captured by a
receive antenna, and recorded on a digital storage device for later
interpretation. The GPR method measures the travel time of
electromagnetic impulses in subsurface materials.
Antenna is able to detect and measure the depth of reflecting discontinuities
in subsurface.
Cont...
9. Operating Frequency
There is an optimum choice of frequency of operation to achieve
best performance in terms of depth and ability to see details in the
target structure. This choice is between 1 and 5000 MHz. Generally low
frequencies are used for deep probing (>50 m) and high frequencies are
used for shallow probing (<50 m).
The initial frequency estimation formula:
X-specify a desire spatial resolution
K - relative permittivity (dielectric constant) of most material
10. Resolution (depend on Frequency)
Low frequencies (a few MHz) give good depth penetration, but low
resolution ( more than 50 m).
High frequencies (about a GHz) can resolve cm-sized objects, but
penetrate only a meter or less in many materials ( less than 50 m).
In archaeology, resolution is generally more important than depth, so
high frequencies are commonly used.
In geologic survey, depth is generally more important than resolution,
so low frequency are used to survey.
11.
12. How Deep Can It Go?
For applications requiring higher
resolution, such as locating conduits in
concrete, a higher frequency GPR system
(1,000 MHz) is used. This will give high
resolution detail for down to approximately
24 inches in depth. Applications which
require deeper penetration in ground soil
requires a lower frequency (12.5 MHz to 500
MHz). Depending on the subsurface material
the depth range can be from a few inches to
thousands of feet (as indicated in the chart).
15. The GPR image shows buried objects in a hyperbolic shape; the top
of the hyperbola represents the exact location of buried object. It is
a well known fact that GPR images are obtained by using a single
radio-wave frequency
Regular radar image interpreters decide the exact location and
depth of targets depending on a direct distance measurement from
the top of the hyperbola
16. How create Hyperbola ?
Intensity of frequency
Object distance from transmitter
Angle/cone
17. 3D GPR Images
Multiple lines of data systematically collected over
an area may be used to construct three-dimensional
or tomographic images. Data may be presented as three-
dimensional blocks, or as horizontal or vertical slices.
18. Components of GPR
1) Transmitter Antenna
The GPR transmitter produces the short duration high-power RF pulses
of energy that are radiated into ground by the antenna.
2) Receiver Antenna
The GPR receiver receive reflected/backscattered RF pulses of energy
from the object which are located in beneath the ground.
As a general rule, the frequency of the antenna determines the depth
of penetration and the resolution – the higher the frequency the better the
resolution but at the expense of the depth of penetration.
3) The Control unit
The Control unit is the brain center for the GPR system and is
responsible for coordinating the operation of the subordinate components.
It has ability to control all functions of GPR and it is one of the main junction
of data flow.
19. 4) Display unit
Display continuous cross sectional profile or record of subsurface features
to operator.
5) Power unit
provide power to all GPR system to active work
6) Software's
RADAN
GPRmax
GPRslice
20.
21. Advantages of GPR
high speed recording (8km/hr)
Able to detect voids and trenches
Able to determine depths and lengths of targets
Colors also improve data quality
Easy to handle
Changeable frequency (1 mhz 5 ghz)
Real time display unit represent cross sectional profile
Used in lot of applications
22. Disadvantages of GPR
Higher frequencies do not penetrate as far as lower frequencies
(penetration is limited )
Doesn't work well in clay
Terrain must be flat and even
Interpretation of radargrams is generally complex
Cellular telephones, two-way radios, television, and radio and
microwave transmitters may cause noise on GPR record
Highly expensive survey method
23. Brief overview of Application of GPR
To find out underground utilities
Mapping Groundwater Table
Archeological survey
Mapping Karst Features
Sinkhole surveys
Geological & Geophysical studies
Concrete inspection
Locating trenches and landfills
Forensic & security
Underground tank storage location
24. Conclusion
GPR has been developed into a sophisticated technique that can
provide detailed images of the near surface. GPR is a time-dependent
geophysical technique that can provide a 3-D pseudo image of the
subsurface, including the fourth dimension of color. It can also provide
accurate information of depth estimation for many common subsurface
objects.
In the field of Earth science, it used to study bedrock, soils,
groundwater, and ice depth estimation. GPR is an excellent tool for
mapping underground surface of the earth in recent geological and
geophysical studies.
25. References:-
Ground penetrating radar – theory and application-Harry.M. Jol
Ground Penetrating Radar Fundamentals by Jeffrey J. Daniels
Online reference sites-
http://www.global-gpr.com/gpr-technology/how-gpr-works.html
http://www.geo-radar.pl/en/methods/georadar/working/
http://undergroundsurveying.com/technology/ground-penetrating-radar-gpr/
http://geomodel.com/methods/ground-penetrating-radar/
Editor's Notes
This is probably one of the most commonly asked questions.