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Crop Water Use Map

CWUM is a transformation of Normalized Difference Vegetation Index (NDVI) imagery that uses estimated crop evapotranspiration, which is the amount of water lost from topsoil (evaporation) and plants (transpiration). CWUM consists of a map with a single value per pixel computed for a given day/scene and has been designed to have a better correlation with end-of-season corn yield.

To be relevant for irrigation planning and other use-cases, crop evapotranspiration is calculated using weather data from the day before the given day/scene.

The standard equation to calculate crop evapotranspiration is:


where Kc is a composite crop coefficient and ET0 is a transpiration coefficient.


Example CWUM where dark purple shows the most evapotranspiration and yellow shows the least evapotranspiration

Technical aspects of a CWUM

Crop Water Usage Map (CWUM) Bayer AgPowered Service analyzes field-level satellite imagery and provides customers with insights into the water usage of a field. CWUM takes the imagery from Azure Data Manager for Agriculture (ADMA) as input to output water usage insights.

Supported Regions

CWUM Bayer AgPowered Service uses Sentinel L1C as the source for satellite imagery through ADMA. As a result, the CWUM service supports the same regions as ADMA.

Install CWUM APS

To install the CWUM APS, start here.