Yuka Sato
A Study on reconstruction restoration grasp method of disaster farmland by using time series Satellite image
Atsushi Rikimaru,Kazuyoshi Takahashi,Kenta sakata
Passed four years from occurred on March 11, 2011 Tohoku-Pacific Ocean earthquake,Salt removal work in the agricultural land proceeds,farmland of 11660ha to be approximately 90% of the target agricultural land has been restored to the 2013 fiscal year.However,rather than a reconstruction completed in the restoration of agricultural land,crops are planted after the restoration as farmland,And it can not be said that the reconstruction to be the normal growth.So, for the affected farmland, it was considered important to determine the reconstruction farmland restoration was agricultural land and crops are planted successfully.In this study, in order to understand the reconstruction and restoration of the state affected farmland Great East Japan Earthquake,Extract the farmland by using the time-series satellite image information,That consider he grasp method of the disaster,reconstruction and restoration of the state agricultural land from historical patterns of planting distribution for the purpose.
In this study, in order to understand the rehabilitation and reconstruction of the history of the affected agricultural land, it was to get the satellite image data of five years.And extracted the planting area of rice and soy that is the subject crops from satellite data.Extraction of rice planting area was extracted by using the rice planting determination index RCI.Extraction of soybean planting area, and extracted with unsupervised classification.Cropping farmland image of each year,field survey and validation in Googlemap,94% in rice, matching a legal rate of 80% in soybean.In addition, the recovery has been in the region in administrative material, the field in which growth irregularity has occurred newIt was discovered in.Superposition cropping farmland image in the aged, was to create a reconstruction restoration farmland history view.From reconstruction restoration history view, to calculate the percentage of restoration to the area of agricultural land each year.Earthquake year in which agricultural land is 6.3% , which was restored in 2011,the recovered farmland is 59.2% in 2014,the recovered farmland is 89.7% in 2015.That agricultural land that is not recovered is 10.3% has been confirmed.As a result of visual comparison farming resumption year information and reconstruction recovery farmland history view Miyagi a target area has been published, it was confirmed that substantially matches.By using this technique Information of the area straddling the fine area of information and jurisdictions in which government has not announced also it is possible to catch a plane to satellite
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