As per my view, this could not be used directly for ground water assessment. You can use other satellite data like GRACE gravity data for your purpose. However, this could be an interesting topic for R&D activity.

GRACE satellite can sense changes in groundwater water storage after few steps. Of course, the data of this satellite is not an image and is a measure of time dependent gravity. You can read this paper:

Article Validation of GRACE based groundwater storage anomaly using ...

thank you very much

You can use GLDAS and GRACE data to estimate groundwork in few centimeter. GLDAS have four land surface models. Each model has soil moisture layer at different depth from the surface. You can select depth as much as you want to subtract from GRACE data.

Can you provide me with the software?

Calculating the amount of groundwater beneath the surface using satellite images, especially for a few centimeters of depth, is a challenging task. While remote sensing techniques and satellite data can provide valuable information about surface water and some aspects of groundwater, accurately quantifying groundwater at shallow depths typically requires specialized sensors and ground-based measurements. Here are some important considerations:

In summary, while satellite data can contribute to groundwater studies by providing information on land surface conditions and large-scale changes in groundwater storage, it is not typically used to directly measure groundwater at shallow depths. Specialized sensors like Ground Penetrating Radar and in situ monitoring equipment are more suitable for this purpose. Combining various data sources, including satellite imagery, ground-based measurements, and hydrogeological models, can provide a more comprehensive understanding of groundwater resources.