研究表明，洪旱灾害受灾面积的时序分布具有分形特征。
The time serials was discussed and the fractal dimension was computed.
最后依据干旱指数建立了干旱受灾面积和成灾面积评估模式，以及干旱经济损失评估模式。
Finally, assessment the model of area covered by drought, the area affected by drought and the economic losses of agriculture by drought is established according the drought index.
问题的关键在于即使是从近距离的上空也难以知道这次灾难的受灾面积，何况是几千英里之外，难度就更大了。
The point is that it is hard to get a sense of this disaster's scale, even from up close but all the more so from thousands of miles away.
全年农作物受灾面积3999万公顷，下降18.4%。其中，绝收403万公顷，下降29.8%。
Natural disasters hit 39.99 million hectares of crops, down 18.4 percent, of which 4.03 million hectares of crops was demolished, down 29.8 percent.
由此，用植被供水指数确定了各地州的受灾面积，并建立了植被供水指数估计地面干旱指数的遥感方程。
Thus the drought area in different regions could be determined and regression equations to estimate surface drought index by vegetation supply water index were established.
单单是佛罗里达州，自今年初就有近4000起林野火灾，受灾面积大约有200,000英亩(8万公顷)。
Florida alone has had nearly 4, 000 wildfires since the start of the year, with about 200, 000 acres (80, 000 hectares) burned.
单单是佛罗里达州，自今年初就有近4000起林野火灾，受灾面积大约有200,000英亩(8万公顷)。
Florida alone has had nearly 4,000 wildfires since the start of the year, with about 200,000 acres (80,000 hectares) burned.
农业受灾面积预测是从以往受灾面积的数据中总结受灾面积变化的规律性，并用这个规律动态地预测未来的受灾面积。
Agricultural disaster area forecast is made based on summary up the rules of the disaster area change from the historical data and these rules are used to forecast the future disaster area.
林而达表示，气候变化对中国农业用地的影响范围正日益扩大。2005年农田受灾面积为3882公顷，而到了2007年，这个数字攀升到4899公顷。
Climate change is affecting an increasingly large area of crop-growing land in China — up from 3,882 hectares hit by natural disasters in 2005 to 4,899 hectares in 2007, Lin said.
林而达表示，气候变化对中国农业用地的影响范围正日益扩大。2005年农田受灾面积为3882公顷，而到了2007年，这个数字攀升到4899公顷。
Climate change is affecting an increasingly large area of crop-growing land in China — up from 3,882 hectares hit by natural disasters in 2005 to 4,899 hectares in 2007, Lin said.
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