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You can contact us to discuss further! www.altomaxx.com/contact-us/

The magnetometry sensor has a high sampling rate, which means it is possible to filter out the constant noise produced by the motors during raw data export.

Yes! GPR can identify tunnels or cavitations underground. As for depth, this figure varies, and is heavily dependent on characteristics of the ground. For more information reach out to one of our GPR specialists here: www.altomaxx.com/contact-us/

It’s difficult to provide exact figures, as the penetration depth of the GPR signal depends greatly upon the soil conditions of each site. It also depends upon the frequency of the sensor you are using. We have both mid-frequency and low-frequency drone GPR units, but they’re used for very different applications. If you have a specific project in mind, you can contact us to discuss further! www.altomaxx.com/contact-us/

Our pleasure!

The system should be able to detect such a change in exterior pipe dimensions. This would be observed in post-processing as a change in the hyperbola width as the GPR signal reflects off the pipe.

We provide both drone magnetometry services, as well as the hardware system. Please reach out if you're interested in a quote! www.altomaxx.com/contact-us/

The drone GPR system is equipped with a laser altimeter that allows it to fly in True Terrain Following mode, enabling it to maintain a constant height above the ground, hugging the terrain as it flies over hills and other surface features. Trees, however, present an obstacle for any GPR system because they reflect the GPR signal and prevent it from penetrating the ground. It is possible to pre-plan your drone GPR flights to avoid wooded areas, or even to fly manually to navigate around trees. However, it is not advisable to conduct drone GPR above the forest canopy. Firstly, flying from such a height would greatly diminish the penetration depth and resolution of the GPR signal. Secondly, in many jurisdictions Ground Penetrating Radar cannot legally be used above a specified altitude (For example, 1 meter is the max GPR altitude in Canada and the US). This height restriction is easily handled with the True Terrain Following mode of the drone GPR system but would typically mean you cannot fly above treetops. If you have any further questions about the realities of using drone GPR, please don't hesitate to reach out! www.altomaxx.com/contact-us/

Glad your found the webinar useful!

My first thought as well, I would love to hear an answer to this.

I believe you are asking too much. There is surely an answer. However, for those like me who have experienced the traditional bathymetry of hard labor on a poor little leaking canoe, I can assure you that this system has the merit of existing! :D Next, regarding the sensor's offset, the calculations to approximate its planimetric position don't seem too complicated. You know the tether's length, the z-coordinate of the drone, and thus the z-coordinate of the water at the time of immersion, etc. But indeed, we can see the infamous 'saw teeth' on the slopes in the renderings, which clearly show the disregard for horizontal offset. By using a clean slope or a regular launching ramp, and by making a round trip in the direction of the slope, we can very easily recover the towing offset constant.

Thanks for your question! The drone is indeed where the GPS position is taken, so the sensor where the data is recorded may be offset somewhat. However, there are several ways to reconcile this discrepancy. Firstly, the drone is pre-programmed to fly at a set height above the surface, and the sensor is attached to a tether with a known length. Secondly, there is a tilt sensor attached to the echo sounder that records its angle relative to the y-axis for each data point. This tilt angle is used during post-processing to remove data points where the sensor tilted too far, or to calculate and correct the horizontal offset of the GPS location. You can read more about it in this whitepaper: integrated.ugcs.com/files/bathymetry/bathymetry-using-uav-accuracy-concerns.pdf

The bathymetry sensor is tethered to the drone but is only submerged approximately 9 inches while collecting data, making it less likely to hit debris that is submerged beneath the surface. As well, there is a “grasshopper mode” where the drone dips the sensor at select points rather than drags it through the water. This might be an option if debris is a concern. If you have other questions, feel free to reach out! www.altomaxx.com/contact-us/

The real advantage of using drones for this type of data acquisition is that it allows for the scanning of areas that cannot be accessed by other tools, or large areas where typical methods would be inefficient. For magnetometry (and GPR/sonar) scans, our drones can fly along the surface at a very low, predetermined altitude. This provides quality data that is sufficient for most applications. While having a ground-coupled system gives optimal data, collecting this level of data is often not necessary or practical. So, it really depends on what you’re scanning and what you’ll be using the data for! If you have any other questions or would like to discuss if drone data acquisition is right for your needs, please get in touch! www.altomaxx.com/contact-us/

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