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干旱是常见的自然灾害之一,持续的干旱将会严重制约农业发展。相比于传统干旱监测,遥感手段具有稳定、连续、大尺度观测等特点,已逐渐成为干旱监测的趋势和热点。本文采用Moderate-resolution Imaging Spectroradiometer(MODIS)归一化植被指数的月数据来计算距平植被指数,进而分析2014年至2016陕西省9月份至11月份的干旱情况。结论表明,在时间上,陕西省2014年至2016年每年9月份的旱情相比其他月份更为严重,并且干旱等级及面积逐年增加。在空间上,关中地区的旱情较为严重,陕南近3年部分地区逐渐开始出现旱情。本文的研究对于未来的抗旱减灾工作具有重要的指导意义。
Drought is one of the common natural disasters, and continued drought will severely constrain agricultural development. Compared with traditional drought monitoring, remote sensing has the characteristics of stable, continuous and large-scale observation, and has gradually become the trend and hot point of drought monitoring. In this paper, monthly data of normalized vegetation index using Moderate-resolution Imaging Spectroradiometer (MODIS) was used to calculate the anachronodal index, and then the drought situation in Shaanxi Province from September to November 2014 was analyzed. The conclusion shows that in terms of time, the drought in September of each year in Shaanxi Province from September to September 2016 is more serious than the other months, and the drought level and area are increasing year by year. In space, the drought in the Guanzhong area is more serious, and some areas in southern Shaanxi have gradually started to experience drought. The research in this paper has important guiding significance for the future work of drought relief and disaster reduction.