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Spatial-Temporal Distribution of Drought in The Western Region Of Paraguay (2005-2017)

机译:巴拉圭西部地区干旱的时空分布(2005-2017)

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The Western Region of Paraguay is naturally dry which makes it vulnerable to almost permanent drought events. Hence, low cost drought monitoring is necessary. Therefore, an index derived from satellite image information was used for this purpose. The Normalized Difference Drought Index (NDDI) was used with the objective of studying the characteristics (temporal and spatial distribution) of drought in the Western Region of Paraguay from years 2005 to 2017 and relate drought point values of NDDI to the land use cover of the study area. Terra satellite’s Moderate Resolution Imaging Spectro-radiometer (MODIS) sensor images were used for the calculation of NDDI. The driest month of all years (July) and the wettest month of all years (December) were averaged to analyze spatial tendencies. The NDDI was contrasted spatially with the Land Use Cover of the Western Region to pinpoint the location of the highest values. The year 2015 had the highest value of 0.9847 in agricultural land use in the Department of Boqueron. The NDDI was a good indicator of drought throughout the region and could be a complement for in-situ measurements.
机译:巴拉圭西部地区自然干燥,这使得几乎常驻干旱事件易受伤害。因此,需要低成本的干旱监测。因此,为此目的使用源自卫星图像信息的索引。归一化差异干旱指数(NDDI)用于研究从2005年至2017年从2005年到2017年从Paraguay西部的干旱的特征(时间和空间分布),并将NDDI的干旱点价值与土地利用封面联系起来研究区。 Terra卫星的适度分辨率成像光谱辐射计(MODIS)传感器图像用于计算NDDI。所有岁月(7月)的干燥月和全部潮湿的月份(12月)都是平均分析空间倾向。 NDDI在空间上与西部地区的土地利用盖进行对比,以确定最高值的位置。 2015年在Boceron系的农业用地使用的最高价值0.9847。 NDDI是整个地区干旱的良好指标,可以是出于原位测量的补充。

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