Ayumi HIGUCHI
Grasp of the time series of coastal forest growth situation after the tsunami disaster using RapidEye satellite images
Prof. Atsushi RIKIMARUˇ¦Kenta SAKATA
East Japan great earthquake disaster occurred on March 11, 2011. It was cut down many shores forest by a tsunami. In the field of remote sensing, it is analyzed the shore forest damage situation using 4 bands of visible level (R,G,B)and NIR. Other than these bands, there is Red Edge band with the role that is important to the analysis of the plant. Because there are few managed satellite sensors, the Red Edge band has few studies of the vegetation using the Red Edge band.
I used satellite image having visible level and NIR band and Red Edge band in this study. I analyzed it about the shore forest which I paid my attention to the R, Red Edge, NIR band, and was affected by the tsunami by the East Japan great earthquake disaster.
I used the data of the RapidEye satellite for analysis. I aimed at Natori-shi, Miyagi for the analysis. I used a satellite image observed on June 3, 2011 and July 15 and August 10.
The tree sample extracted a black pine, a Japanese red pine, a cedar. For a comparison, I extracted the tree which caught the tsunami damage and the tree which did not catch the tsunami damage. It may be said that a tree is in a healthy state as for the reflectance of the R band is low, and the reflectance of the NIR band being high. Therefore, I thought that I could grasp the growth situation of the tree with the difference of the value of Red Edge band and the NIR band and the value of the R band. From this, I performed growth situation grasp of the shore forest using a value of (NIR)-(R) and (Red Edge)-(R).
As a result, it was confirmed that the black pine died by tsunami damage. It was confirmed that the tree that the Japanese red pine did not catch the tsunami damage died. It was confirmed that the cedar died by tsunami damage.
In this study, I understood the change of the vegetation spectrum by having used the reflectance of the Red Edge band. Therefore, using the information of R band and Red Edge band and the NIR band, possibility of the chronological order grasp of the growth situation of the shore forest which received tsunami damage was provided.
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