Monthly evapotranspiration dataset with 30m spatial resolution over oasis in the middle reaches of the Heihe River Basin Version 1.0 (2000-2013)

ET（Evapotranspiration）monitoring is essential for agricultural water management, regional water resources utilization planning, and socio-economic sustainable development.The limitations of the traditional monitoring ET method are mainly that large-area simultaneous observations cannot be made and can only be limited to observation points. Therefore, the cost of personnel and equipment is relatively high, and it is unable to provide ET data on the surface, nor to provide the ET data of different land use types and crop types.Quantitative monitoring of ET can be achieved by remote sensing. The characteristics of remote sensing information are that it can reflect both the macroscopic structural characteristics of the Earth's surface and the microscopic local differences.Monthly evapotranspiration datasets (2000-2013) with 30m spatial resolution over oasis in the Middle Reaches of Heihe River Basin Version 1.0 are based on multi-source remote sensing data. The latest ET Watch model is used to estimate the raster image data. Its temporal resolution is monthly and spatial resolution is 30 meters. The data cover the middle reaches of Zhangye oasis area in millimeters. The data types include month, quarter, and year data.The projection information of the data is as follows:Albers equivalent conical projection,Central meridian: 110 degrees,First secant: 25 degrees,Second secant: 47 degrees,Coordinate west deviation: 4000000 meters.The file naming rules are as follows:Monthly cumulative ET value file name: heihe-midoasis-30m_2013m01_eta.tifAmong them, heihe indicates the Heihe River Basin, midoasis indicates the middle oasis area, 30m indicates the resolution is 30 meters, 2013 indicates 2013, m01 indicates January, eta indicates actual evapotranspiration data, and tif indicates that the data is in tif format;The ET value file for each season is named: heihe-midoasis-30m_2013s01_eta.tifAmong them, heihe indicates the Heihe River Basin, midoasis indicates the middle oasis area, 30m indicates the resolution is 30 meters, 2013 indicates 2013, s01 indicates 1-3 months, for the first quarter, eta indicates actual evapotranspiration data, and tif indicates that the data is in tif format;The annual cumulative value file name: heihe-midoasis-30m_2013y_eta.tifAmong them, heihe indicates the Heihe River Basin, midoasis indicates the middle oasis area, 30m indicates the resolution is 30 meters, 2013 indicates 2013, y indicates the year, eta indicates the actual evapotranspiration data, and tif indicates that the data is in tif format.

蒸散量（ET）监测对于农业水管理、区域水资源利用规划以及社会经济可持续发展至关重要。传统监测蒸散量的方法存在诸多局限，主要体现在无法进行大范围同步观测，观测点受限，导致人力和设备成本较高，且无法提供地表及不同土地利用类型和作物类型的蒸散量数据。通过遥感技术可以实现蒸散量的定量监测。遥感信息的特点在于，它能同时反映地球表面的宏观结构特征和微观局部差异。黑河中游绿洲区域（2000-2013年）月度蒸散量数据集（版本1.0）基于多源遥感数据构建，采用最新的ET Watch模型对栅格图像数据进行估算。该数据集的时分辨率为月度，空间分辨率为30米，数据覆盖了张掖绿洲中游区域，单位为毫米。数据类型包括月度、季度和年度数据。数据投影信息如下：阿尔伯斯等角圆锥投影，中央经线：110度，第一偏心：25度，第二偏心：47度，坐标西偏移：4000000米。文件命名规则如下：月度累积蒸散量文件名：heihe-midoasis-30m_2013m01_eta.tif；其中，heihe代表黑河流域，midoasis代表中游绿洲区域，30m代表分辨率为30米，2013代表2013年，m01代表1月，eta代表实际蒸散量数据，tif代表数据格式为tif；每个季节的蒸散量文件名：heihe-midoasis-30m_2013s01_eta.tif；其中，含义与月度累积蒸散量文件名相同，s01代表第一季度（1-3月）；年度累积值文件名：heihe-midoasis-30m_2013y_eta.tif；其中，含义与月度累积蒸散量文件名相同，y代表年份。