Researchers at Purdue University are creating soil sensors that will gather that data to train AI. “Right now, a soil moisture sensor, you’d have about 1 of those per 100 acres.

We tested this unique indoor gardening solution that utilizes NASA technology, but air quality data raised concerns.

SMAP Level-4 (L4) surface and root zone soil moisture (L4_SM) data are provided in three products. The SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data ...

This data set is derived by downscaling Soil Moisture Active Passive (SMAP) enhanced Level-3 9 km brightness temperatures (TB) using Cyclone Global Navigation Satellite System (CYGNSS) reflectivity ...