In water level, analog observation and digital observation are difference in nature. Two kinds of data are consistent in trend and natural quality but different in stability and accuracy.
而水位的数字化与模拟观测，因其观测的原理存在差异，虽然二者的趋势变化一致、内在质量相当，但其精度和稳定性却存在较大差异。
Surface water resources characteristics, such as rainfall, runoff, water quality and so on, were analyzed using the long-term observation data in Yantai City.
根据烟台市多年统计资料，从降水、径流、水质、蒸发等方面对水资源特性进行了分析。
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