CWSI Calculator
Compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one.
Description
Compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one.
CWSI Calculator is a focused biology tool that compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use CWSI Calculator
Use CWSI Calculator when you need to compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one. Enter Canopy temperature, Dry reference temperature, and Wet reference temperature using the definitions and units below so the result can be reproduced.
- Canopy temperature
- Canopy temperature in degrees Celsius.
- Dry reference temperature
- Fully watered dry reference temperature; must exceed the wet reference.
- Wet reference temperature
- Wet reference temperature in degrees Celsius.
How CWSI Calculator calculates the result
The published tool contract uses this rule: Compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one.
- Crop water stress index
- Crop water stress index clamped between 0 and 1.
Limitations of CWSI Calculator
The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability.
Alternative or Complementary measurements
Retain the original Canopy temperature, Dry reference temperature, and Wet reference temperature values and their units alongside the result. NDVI Calculator is useful when you instead need to compute the Normalized Difference Vegetation Index as (NIR - red) / (NIR + red) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero. Vigorous Seedling Index provides another view by helping you compute the vigorous seedling index as seedling dry mass in milligrams times the germination percentage divided by one hundred.
References
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Water scarcity — Wikipedia contributors
Similar or alternative tools
- NDVI Calculator
Compute the Normalized Difference Vegetation Index as (NIR - red) / (NIR + red) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero.
- Vigorous Seedling Index
Compute the vigorous seedling index as seedling dry mass in milligrams times the germination percentage divided by one hundred.
- Crop Growth Rate
Compute crop growth rate in grams per square metre of ground per day as standing dry mass gain divided by ground area times elapsed days.