A daily dataset of air temperature, ground temperature, and snow depth dataset for Northern Hemisphere

The dataset consists of three compressed files (.7z), each containing data in text format, and three metadata files for the three variables (Ta, Sd, and Tg). The data for each station is stored in separate text files, and they all have a consistent time series from 1960/01/01 to 2021/12/31. The total number of files corresponding to the number of stations provided for Ta, Sd, and Tg are as follows: 27,768 files for Ta, 32,417 files for Sd, and 659 files for Tg. Basic information about the measurement station, such as gage name, identification number (ID), coordinates, and gage elevation, is provided in the metadata files. Additionally, for Tg metadata, information about the depths with measured data is also provided. The format of each file for Ta and Sd is consistent, with columns including "Date," "Values," and "Flags." In this format, the "Values" column includes both observed data and derived data, which are determined by flag values. For example, 1 represents observed data, and 2 represents derived data. For Tg data, the columns include "Date," "Depth_," and "Flag_." Since each Tg measurement station has multiple measurement depths, data and flags are provided separately for each depth. The filename for each measurement station is set as ".txt," where latitude and longitude values are rounded to 3 digits after the decimal point.