useful area
1.Reinforced concrete structure under the condition of the abnormal heat (over 200℃), its strength will become lower; concrete surface will fall off; useful-area decreases and the component will be deformed in different level.
6.It was found that SWIR and NIR band reflectance can estimate FMC better, and its R2 can reach 0.36. Though it is a little smaller than that of grassland and bush, this method still can provide efficient estimation of spatial distribution of FMC, so it is useful in forecasting the forest fire behavior of large area.

