Hi,
I am trying to understand the limitations of the Simplified Surface Energy Balance (SSEB) approach and Landsat Collection 2 (C2) Provisional ETa Science Products to estimate actual evapotranspiration of different crops in various locations.
These would be used by an agribusiness to monitoring water consumption and water availability for crops (wheat, rice and corn) grown in 14 different countries
I am struggling to understand if and how these can be applied to different crop / locations couples as Landsat Collection 2 (C2) Provisional ETa Science Products are yet to be validated.
Thanks for your help,
Best regards.
Jihane Guenoun
while satellite remote-sensing techniques can provide valuable insights into crop water use and water availability, there are several limitations to their accuracy and reliability. These limitations must be carefully considered when using satellite-derived ETa estimates for monitoring and managing crop water use in different locations and for different crops.
There are several limitations to estimating actual crop evapotranspiration (ETa) using satellite remote-sensing techniques such as the Simplified Surface Energy Balance (SSEB) approach and Landsat Collection 2 (C2) Provisional ETa Science Products.
Spatial resolution: The spatial resolution of satellite imagery may not be fine enough to capture small-scale variations in ETa, particularly in heterogeneous landscapes with multiple crop types, varying topography, and soil characteristics.
Atmospheric interference: Atmospheric conditions such as cloud cover, haze, and aerosols can interfere with satellite measurements of ETa, particularly in regions with high levels of atmospheric pollution.
Sensor limitations: The accuracy of ETa estimates can be affected by sensor limitations, such as saturation of sensor values, band-to-band misregistration, and sensor noise.
Surface characteristics: The accuracy of ETa estimates can also be affected by surface characteristics, such as the presence of vegetation canopies, soil moisture, and surface temperature variations.
Crop variability: Crop variability, including differences in planting dates, crop management practices, and genetic traits, can result in variations in crop growth and water use that are difficult to capture using satellite remote-sensing techniques.
Calibration and validation: Accurate calibration and validation of satellite-derived ETa estimates is critical to ensure the accuracy and reliability of the data. This requires ground-based measurements of ETa, which can be difficult and expensive to obtain, particularly in remote or inaccessible areas.
Cost and accessibility: The cost of acquiring, processing, and analyzing satellite imagery can be prohibitive, particularly for small-scale farmers or resource-limited agribusinesses. Additionally, satellite imagery may not be readily accessible in some regions, particularly in areas with limited internet connectivity or data infrastructure.
Jihane Guenoun
The SSEB approach and C2 products can be useful tools for monitoring water consumption and availability for crops, but they should be used with caution and validated for the specific crop and location of interest.
The Simplified Surface Energy Balance (SSEB) approach and Landsat Collection 2 (C2) Provisional ETa Science Products can be useful tools for estimating actual evapotranspiration of crops in different locations. However, it's important to be aware of their limitations and the need for validation.
The SSEB approach is based on the relationship between energy balance components and evapotranspiration. It simplifies the complex energy balance equations by assuming that the sensible heat flux is a constant fraction of the net radiation. The SSEB approach can be useful for estimating ETa at a regional scale, but it may not accurately capture the spatial and temporal variability of ETa at a field scale.
The Landsat Collection 2 (C2) Provisional ETa Science Products uses Landsat satellite data to estimate ETa. It relies on a combination of the SSEB approach and a machine learning algorithm to estimate ETa. However, the C2 products are still in a provisional stage and have not been fully validated yet.
It's important to keep this in mind when using the C2 products for monitoring water consumption and availability for crops.
When applying these methods to different crops and locations, it's important to consider the specific characteristics of the crops and the environmental conditions in the area.
For example, different crops may have different water requirements and respond differently to environmental stresses. Therefore, it's important to calibrate and validate the SSEB and C2 products for the specific crop and location of interest.
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