Thermography›Crop Water Stress Index

Crop Water Stress Index (CWSI)

Compute the empirical CWSI from thermal images using wet and dry reference temperatures. CWSI = 0 indicates no water stress; CWSI = 1 indicates maximum stress. Provide empirical baselines measured under your field conditions.

Thermal Image

grayscale

T_wet / T_dry

baselines

CWSI Formula

Jackson 1981

Stress Class

+ CSV export

Baselines required: T_wet = temperature of a well-irrigated, fully transpiring leaf (or wet artificial reference panel). T_dry = temperature of a non-transpiring leaf (e.g. petroleum-jelly coated leaf or dry reference). Both should be measured simultaneously with the thermal image.

Thermal Image

Drop thermal image or click to browse

JPEG / PNG grayscale preview from thermal camera

Temperature Range (°C)

Enter the min/max temperature shown on your camera display when the image was captured.

T min (°C)

T max (°C)

Reference Temperatures

T_wet (well-watered ref)

°C

T_dry (non-transpiring ref)

°C

Add a thermal image to begin

Upload a grayscale thermal image and set your camera range and reference temperatures. CWSI is computed instantly using the Jackson et al. (1981) formula.