Wildfires in BC have been burning since July 7th, 2017 with initial fires burning near Williams Lake and 150 Miles House. The fires are now burning further south, and of critical concern, closer more densely populated areas (Kamloops).
Geomatica 2017 Serial Number With Crack
Sentinel-2 is due to collect an image on July 18/2017 (today), we will be closely watching the ESA archives to see if we can repeat this automated mapping exercise. Volunteer firefighters have been working 12 hour shifts and doing with very little sleep - hopefully these satellite based mapping tools and techniques can assist them in containing fires, protecting properties and planning their daily activities.
Abstract:Crack assessment is an essential process in the maintenance of concrete structures. In general, concrete cracks are inspected by manual visual observation of the surface, which is intrinsically subjective as it depends on the experience of inspectors. Further, it is time-consuming, expensive, and often unsafe when inaccessible structural members are to be assessed. Unmanned aerial vehicle (UAV) technologies combined with digital image processing have recently been applied to crack assessment to overcome the drawbacks of manual visual inspection. However, identification of crack information in terms of width and length has not been fully explored in the UAV-based applications, because of the absence of distance measurement and tailored image processing. This paper presents a crack identification strategy that combines hybrid image processing with UAV technology. Equipped with a camera, an ultrasonic displacement sensor, and a WiFi module, the system provides the image of cracks and the associated working distance from a target structure on demand. The obtained information is subsequently processed by hybrid image binarization to estimate the crack width accurately while minimizing the loss of the crack length information. The proposed system has shown to successfully measure cracks thicker than 0.1 mm with the maximum length estimation error of 7.3%.Keywords: concrete structure; crack identification; digital image processing; structural health monitoring; unmanned aerial vehicle
The landslide in Agboona Hill, probably initiated with the development of parallel normal faults along the horst, further weakening of this zone by fracturing, water infiltration and gravity led to shattering of rocks along this zone. However, numerous open fractures joints, cracks, folds and high strain shears were encountered on the ruptured surfaces. Borehole and geophysical data that can help to verify the influence of earthquake were not available at the time of compiling this manuscript. However, most of the rock fragments displaced by the landslide show well-polished surfaces, suggesting that the dominant processes along this fault zone are bulk crushing, surface grinding and polishing.
Lineament extraction was performed using a LINE module of PCI Geomatica software [48]. The LINE module has many advantages over most the Hough transform and other methods of edge detection [49, 50]. Additionally, the canny edge detection applied in LINE module of PCI gives least false positives when compared with other methods [51]. Spatial distribution of lineaments was examined by further converting the extracted lineaments to a measurable quantity of lineament density. Lineament density is defined as the total length of lineaments per unit area, whereas frequency indicates the total number of lineaments per unit area [52, 53]. The lineament density was computed using the equation
Relic plumose structure preserved on the fracture surface (Fig. 4) shows a feathery Mode 1 (one) joint surface with E-W propagation direction. This is interpreted as the intermediate stress axis δ2. This structure reveals the direction of joint propagation to be E-W, and it was produced due to the changing intensity of the stress field at the tip during the growth of the joint. The stress intensity is proportional to the length of the crack. The Plumose structure is formed when an unexposed joint surface revealed a rough pattern resembling the imprint of a feather. The stress intensity is proportional to the length of the crack.
The rocks in the area have undergone different orogenic episodes and as a result responded differently to the tectonic deformation that has affected the terrain; hence, the numbers and sizes of lineaments (fractures) were extracted from the different lithologies. Based on the computed lineament density (Fig. 9), areas underlain by quartzite are those with the highest density of lineament.
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The Experimental Fracture Mechanics Laboratory is used for preparing and testing specimens using modern dynamic testing machines to develop an understanding of fracture mechanics and to become familiar with experimental techniques available to study crack tip stress fields, strain energy release rate, surface flaws, and crack growth in laboratory samples.
The Mechanical Vibrations Laboratory is used for conducting free and forced vibration and earthquake response experiments on small model structures such as a three-story building, a portal frame, and a water intake/outlet tower for a reservoir. Two electromagnetic exciters, each with a 30-pound dynamic force rating, are available for generating steady state forced vibrations. A number of accelerometers, LVDTs (displacement transducers), and potentiometers are available for measuring the motions of the structure. A laboratory view-based computer-controlled dynamic data acquisition system, an oscilloscope, and a spectrum analyzer are used to visualize and record the motion of the model structures. 2ff7e9595c
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