DETECTION OF EARTHQUAKE TRIGGERED ROOF HOLES
An earthquake (also known as a quake, tremor or temblor)
is the perceptible shaking of the surface of the Earth, which can be
violent enough to destroy major buildings and kill thousands of people.
The severity of the shaking can range from barely felt to violent enough
to toss people around. Earthquakes have destroyed whole cities. They
result from the sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.
Figure., (a),(b) Detected roof holes
Many
methods have been developed to detect damaged buildings due to
earthquake. However, little attention has been paid to analyze slightly
affected buildings. An unsupervised method is presented to detect
earthquake-triggered “roof-holes” on rural houses from unmanned
aerial vehicle (UAV) images. First, both orthomosaic and gradient images
are generated from a set of UAV images. Then, a modified Chinese
restaurant franchise model is used to learn an unsupervised model of the
geo-object classes in the area by fusing both over segmented
orthomosaic and gradient images. Finally, “roof-holes” on rural houses
are detected using the learned model.
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