Low Cost 3D Mapping Using a Commercial Drone/UAV: Application in Structural Geology

This presentation describes an experience of mapping a geological structure with a commercial UAV (Unmanned Aerial Vehicle).

Being based in Venezuela, an appropriate area for the acquisition was identified in the Andes Cordillera where a major strike slip fault (Boconó Fault) intersects geomorphic features modeled by the latest glaciation.

This fault is a major tectonic lineament oriented SW-NE, extending more than 300 km along the Venezuelan Andes and accommodating a dextral slip on the order of 1 cm/year.

This motion has displaced various landscape features that cross the fault, in particularly the "Los Zerpa" moraine system, located a few kilometers NE of the locality "Apartaderos".

The moraine formed during the last glaciation that ended 10,000 years ago; its northern tip crosses the Boconó Fault and is displaced 100 m towards the NE; this corresponds to a rate of 1 cm/year, which is consistent with GPS measurements. 

http://www.searchanddiscovery.com/documents/2017/42054rocca/ndx_rocca.pdf

Change Detection in Aerial Images Using Three-Dimensional Feature Maps

Interest in aerial image analysis has increased owing to recent developments in and availability of aerial imaging technologies, like UAVs (Unmanned aerial vehicles), as well as a growing need for autonomous surveillance systems.

Variant illumination, intensity noise, and different viewpoints are among the main challenges to overcome in order to determine changes in aerial images. In this paper, it is presented a robust method for change detection in aerial images.

To accomplish this, the method extracts three-dimensional (3D) features for segmentation of objects above a defined reference surface at each instant. The acquired 3D feature maps, with two measurements, are then used to determine changes in a scene over time.

In addition, the important parameters that affect measurement, such as the camera’s sampling rate, image resolution, the height of the drone, and the pixel’s height information, are investigated through a mathematical model. To exhibit its applicability, the proposed method has been evaluated on aerial images of various real-world locations and the results are promising.

The performance indicates the robustness of the method in addressing the problems of conventional change detection methods, such as intensity differences and shadows.

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The 20th Attack Squadron locates and kill a terrorist command

The demand for UAVs to conduct armed overwatch missions to help protect United States forces, as well as their allies and partners, isn't going away, but exact the opposite: For the foreseeable future, the Reapers will continue to provide this invaluable service for American troops around the world, as you can see in a recently released video that includes a unique clip that an MQ-9 Reaper captured of militants firing a rocket-propelled grenade at a C-130 Hercules airlifter that was performing an air drop of cargo at relatively low altitude.

In the full video, the UAV's pilot and sensor operator, who later struck those hostile forces, also offer an interesting behind-the-scenes look at how the unmanned aircraft perform these kinds of armed overwatch missions. The Air Force's 432nd Wing at Creech Air Force Base in Nevada, one of the service's premier UAV units, posted the video on YouTube on Apr. 6, 2020. The pilot, 1st Lieutenant Russel, and the sensor operator, Airman First Class Ashley, both assigned to the 20th Attack Squadron, which itself is assigned to the 432nd, but is based at Whiteman Air Force Base in Missouri, describe the event.