Notebook for retrieval of National Water Model Retrospective run results at SNOTEL sites

This notebook has been developed to download specific variables at specific sites from National Water Model (NWM) Retrospective run results in Google Cloud. It has been set up to retrieve data at SNOTEL sites. An input file SNOTEL_indices_at_NWM.csv maps from SNOTEL site identifiers to NWM X and Y indices (Xindex and Yindex). A shell script (gget.sh) uses Google utilities (gsutil) to retrieve NWM grid file results for a fixed (limited) block of time. A python function then reads a set of designated variables from a set of designated sites from NWM grid files into CSV files for further analysis.

The input file SNOTEL_indices_at_NWM.csv was generated using Garousi-Nejad and Tarboton (2022), https://www.hydroshare.org/resource/7839e3f3b4f54940bd3591b24803cacf/.

本笔记本旨在从国家水文模型（NWM）的回顾性运行结果中下载特定站点上的特定变量，并在谷歌云中进行处理。该笔记本已配置为从SNOTEL站点检索数据。输入文件SNOTEL_indices_at_NWM.csv将SNOTEL站点的标识符映射到NWM的X和Y索引（Xindex和Yindex）。一个shell脚本（gget.sh）利用谷歌工具（gsutil）检索固定（有限）时间段内的NWM网格文件结果。随后，一个Python函数从指定的NWM网格文件中读取一组指定的变量，并将这些变量导入CSV文件中，以进行进一步的分析。

输入文件SNOTEL_indices_at_NWM.csv是由Garousi-Nejad和Tarboton（2022）生成的，详见https://www.hydroshare.org/resource/7839e3f3b4f54940bd3591b24803cacf/。