The China industrial water withdrawal Dataset (CIWW) —a gridded monthly industrial water withdrawal data in China from 1965 to 2020.

This is a gridded dataset of monthly industrial water withdrawal (IWW) for China, namely, the China industrial water withdrawal dataset (CIWW). The dataset begins in January 1965 and is ongoing (currently up to December 2020) with a temporal resolution of a month and a spatial resolution of 0.1°/0.25°. The CIWW dataset, together with its auxiliary data, will be useful for water resource management and hydrological models.<b>Version history:</b><b>V1.1_20240403</b><b>Update the seasonal variability</b>.Compared to version 1.0, we estimated the seasonality of the subsector (Electricity and Heating Power Production and Supply,) based on spatial classification and then recreated the CIWW data with the updated seasonal variability. More details are described in Hou et al. (2023). The seasonal variation in the updated version is less different from the previous one.<b>V1.0_20230209</b><br><br><b>Using notes：</b><b>Updated notes about opening the data with ArcGIS and other software (Jan 13, 2025)</b>When opening the CIWW dataset (NetCDF format) in ArcGIS, the following issues may appear, as reported by users:1) The file cannot be successfully opened in ArcGIS.2) The time dimension value could not be properly displayed (e.g., time fixed to January 1, 1965).a) For ArcGIS users, it is recommended to utilize the <b>Multidimension Tools</b> in the toolbox and select the <b>Make NetCDFRaster Layer</b> tool. During the import process:Choose <b>iww_layer</b> as the variable.Select <b>time</b> as the third dimension in addition to longitude and latitude.After importing, open the <b>Properties</b> of the layer and navigate to the <b>Symbology</b> tab. You will see 672 different bands, representing the monthly data from January 1965 to December 2020.If the dataset is directly dragged into ArcGIS, the variable <b>cell_area</b> will be opened by default. This variable represents the area of each grid cell at a resolution of 0.25°/0.1° within the longitude and latitude range of China. The industrial water withdrawal is provided in units of mm/month. If needed, you can convert this to m³/month by multiplying the values by the corresponding grid cell area. For detailed variable descriptions, refer to the <b>readme.txt</b> file.b) The CIWW dataset can be opened using QGIS. Users can select the relevant dimensions and drag the dataset directly into QGIS. The time dimension includes 672 bands, with each band representing the number of days since January 1, 1965.c) The NetCDF format CIWW dataset can be easily opened by any programing language with NetCDF capabilities, for example, the <i>xarry</i> package in Python, Matlab, R, and others).<b>Authors:</b> Chengcheng Hou ([e-mail]), Yan Li ([e-mail]).<b>Reference: </b>Hou, C., Li, Y., Sang, S., Zhao, X., Liu, Y., Liu, Y., and Zhao, F.: High-resolution mapping of monthly industrial water withdrawal in China from 1965 to 2020, Earth Syst. Sci. Data Discuss. [preprint], https://doi.org/10.5194/essd-2023-66, in review, 2023.

本数据集为中国月度工业取水量（industrial water withdrawal, IWW）格点数据集，即中国工业取水量数据集（China Industrial Water Withdrawal Dataset, CIWW）。本数据集时间跨度为1965年1月至2020年12月（当前更新至2020年12月），时间分辨率为月度，空间分辨率为0.1°/0.25°。本数据集及其配套辅助数据可服务于水资源管理与水文模型研究。
版本更新历史：
V1.1_20240403：更新季节变异性特征。相较于V1.0版本，本研究基于空间分类方法估算了细分行业（电力、热力生产和供应业，Electricity and Heating Power Production and Supply）的季节变化特征，并基于更新后的季节变异性重新生成了CIWW数据集。详细信息参见Hou等人（2023）的研究。本次更新后的季节变异性与前一版本差异较小。
V1.0_20230209

使用说明：
2025年1月13日更新：关于使用ArcGIS及其他软件打开本数据集的补充说明
用户反馈，在ArcGIS中打开NetCDF格式的CIWW数据集时，可能出现以下问题：1）无法成功加载该文件；2）时间维度值无法正常显示（例如时间被固定为1965年1月1日）。
a) 针对ArcGIS用户，建议使用工具箱中的<b>Multidimension Tools</b>并选择<b>Make NetCDFRaster Layer</b>工具。导入过程中需注意：将变量选为<b>iww_layer</b>，并将<b>时间（time）</b>作为除经度、纬度外的第三维度。导入完成后，打开图层的<b>Properties</b>并切换至<b>Symbology</b>选项卡，即可看到672个波段，分别对应1965年1月至2020年12月的月度数据。
若直接将数据集拖拽至ArcGIS中，将默认加载变量<b>cell_area</b>，该变量代表中国经纬度范围内0.25°/0.1°分辨率下每个格网的面积。工业取水量的单位为mm/月，若需转换为m³/月，可将数值乘以对应格网的面积。变量的详细说明请参见<b>readme.txt</b>文件。
b) QGIS可直接打开CIWW数据集：用户可选择相关维度后，将数据集直接拖拽至QGIS中即可。该数据集的时间维度包含672个波段，每个波段代表自1965年1月1日起的天数。
c) 支持NetCDF格式的编程语言均可便捷读取CIWW数据集，例如Python中的<b>xarry</b>包、Matlab、R等。
作者：侯程成（[e-mail]）、李妍（[e-mail]）
参考文献：Hou, C., Li, Y., Sang, S., Zhao, X., Liu, Y., Liu, Y., and Zhao, F.: 1965-2020年中国月度工业取水量高分辨率制图，Earth Syst. Sci. Data Discuss. [预印本]，https://doi.org/10.5194/essd-2023-66，待审，2023年。

搜集汇总

背景与挑战

背景概述

该数据集是中国工业用水量的网格化月度数据，覆盖1965年至2020年，提供0.1°和0.25°两种空间分辨率的NetCDF格式文件，适用于水资源管理和水文模型研究。数据集支持多种软件和编程语言使用，并包含详细的子行业分类信息。