Table 1 The list of data sources.
Data | Quantity or accuracy | Unit | Data sources |
|---|---|---|---|
NDVI | 250 m | MOD13Q1 remotely sensed data (https://ladsweb.modaps.eosdis.nasa.gov/) | |
Precipitation data | 5 km | mm | Google Earth Engine /UCSB-CHG/CHIPS/DAILY |
Temperature data | 1 km | °C | Google Earth Engine /MODIS/061/MOD11A1 |
Groundwater depth | 192wells | m | the China Institute of Geo-Environmental Monitoring (CIGEM) |
TDS of groundwater | 46wells | g/L | Hebei Provincial Water Environment Testing Center |