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在用降水量与作物需水量相比较来确定旱情的同时考虑当地的抗旱能力，引入了灌耕比的概念，结合ＮＯＡＡ／ＡＶＨＲＲ资料分析判断河北省夏季干旱的发生程度。应用此方法对１９９７年和１９９８年夏旱进行评定，结果与实际相符。
The concept of irrigation ratio was introduced by comparing the precipitation with the crop water demand to determine the drought resistance and to consider the local drought resistance capability. The NOAA / AVHRR data analysis was used to determine the occurrence of summer drought in Hebei Province. This method was used to assess the summer drought in 1997 and 1998 and the results are in line with the actual situation.