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Journal of Young Scientist. The methods were applied on satellite images acquired by different types of missions in terms of sensor optical and radarspatial and spectral resolution.
We used optical SPOT images with a spatial resolution of 20 m that are acquired in 3 spectral bands, Landsat images with spatial resolution of 30 m, 7 spectral bands and TerraSAR-X radar images with a resolution of formateur excel suisse anti aging m. In order to obtain optimal results, the most appropriate input data should be represented by: radar images for earthquakes and floods and optical images for fires and floods.
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The first case study focused on the floods in the Eastern part of Romania, namely the Siret river floods on the Nanesti-Silistea sector in July and the Prut River floods that took place in late July and early august The second case study was represented by the forest fires of Corsica, which is the third biggest island in the Mediterranean Sea, located at a distance of kilometers south coast of France and 80 kilometers west coasts of Italy.
These fires have occurred in August-Septemberwhen 27, hectares of vegetation were burnt. The third case study consisted of the Haiti earthquake that occurred on January 12,at p.
It was a major earthquake with a magnitude of 7.
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The epicenter was located near the Port-au-Prince capital. The processing methods image classification and change detection were selected and adapted for each type of satellite data.
In conclusion, remote sensing is very useful in monitoring the effects of natural disasters. A very important aspect is choosing the optimal data depending on the disaster type floods and earthquakes — optical and radar, fires — optical.
Equally important is the resolution of the images in relation to the investigated phenomenon. For example, in the case of the Haiti earthquake, satellite images with a spatial resolution better than 30 meters would have been more useful.
Key words: disaster monitoring, earthquakes, fires, floods, satellite images.
For floods, two events located in the Eastern part of Romania were chosen. The second flood event occurred on the Prut River in July-August Red code alerts were transmitted during the floods that affected the North-East part of the country infor the populated areas along the Prut River.
In Radauti, the river burst its banks and inundated about 5, hectares of land in the dammed area. For the second case study, the forest fires that affected Corsica in August-September were selected. More than 27, hectares of vegetation were burnt.
Corsica is the third largest island in the Mediterranean Sea in terms of size and it is located at a distance of kilometers from the southern coast of France and 80 kilometers from the western shores of Italy.
Initially, the third case study focused on the earthquake that hit Bucharest inbut the images from the United States Geological Survey USGS archive could not be used because the area of interest was completely covered by clouds.
The earthquake occurred at p. With a magnitude of 7. Across the country about 11, people were wounded and about 35, houses collapsed. Most property damage concentrated in Bucharest where more than 33 large buildings collapsed. However, in order to develop a case study for this type of disaster too, the earthquake that occurred in Haiti on January 12,at p. It was a severe earthquake with a magnitude of 7.
The epicenter was located near Port-au-Prince, the capital of Haiti. The greatest damage occurred in the heart of the capital where thousands of persons were reported missing. After the great earthquake, at least 52 aftershocks took place, measuring up to 4. These led to a number ofresidences and 30, commercial buildings that collapsed or were severely damaged.
On 28 Januarythe number of victims found under the debris reached approximatelydeaths. On February 4, the total number of victims was estimated atdead,injured and 1, homeless people.
Also, a large number of organizations around the world contributed financially and by delivering supplies for the people in need. The specific processing methods were applied on satellite images acquired by different missions in terms of the type of sensor optical and radar and spatial and spectral resolution.
Thus, formateur excel suisse anti aging optical remote sensing data consisted of SPOT images with a spatial resolution of 20 m three spectral bands and Landsat TM images with spatial resolution of 30 m seven spectral bands.
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In terms of data acquired by radar remote sensing sensors, a TerraSAR-X image with a resolution of 3 m was used. Landsat images are available online and can be downloaded for free © Landsat images are courtesy of the U. In addition to the satellite images mentioned before, a vector dataset containing land cover classes was used. The processing methods were selected and adapted depending on the type of satellite image.
Visual image interpretation was used for the identification of the areas affected by floods. Visual interpretation is a combination of art and science based on intuition and it is used to identify and differentiate the features of objects and phenomena.
Advanced visual interpretation requires extensive experience that is developed through specific training and practice over a long period of time Badea, a. The main processing method used for the identification of the damage caused by fires in Corsica and earthquake in Haiti was change detection.
Using this technique, the changes in landscape over a given period of time can be identified and analyzed. Thus, the spatial distribution of qualitative and quantitative information regarding the modifications of the analyzed objects is highlighted in change detection maps Badea, aShaoqing and Lu, In order to obtain optimal results and accurate disaster monitoring maps, it is recommended to use optical and radar HH polarization images for floods, optical for fires and radar for earthquakes.
Currently, satellite imagery or satellite-derived products are provided free of charge by the following disaster monitoring services: the International Charter on "Space and Major Disasters" www.
Formateur excel suisse anti aging the moment, all these disaster management services are fully operational Badea, b. The image was acquired on July 16, and it covers the Nanesti-Silistea area of interest that is defined by the coordinates listed in Table 1. Table 1.