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The crop water stress index (CWSI) was developed (in 1981) as a normalized index to quantify stress and overcome the effects of other environmental parameters affecting the relationship between stress and plant temperature.


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The crop water stress index (CWSI) was developed (in 1981) as a normalized index to quantify stress and overcome the effects of other environmental parameters affecting the relationship between stress and plant temperature. Workswell’s WIRIS Agro is the first device of its kind designed to map water stress across large areas in the field of precision agriculture. The aim of this method and device is to determine the value of water stress in the plant stand. For example, this information may be used to determine yield maps, optimize irrigation, or control water management remedies. Camera offers LWIR band sensor and 10x optical zoom RGB camera with resolution full HD (1920 x 1080 px) for biomass cover index evaluation.



Main applications of WIRIS Agro

Although there are many uses, we can divide the main WIRIS Agro usage into these four applications:

  • Water status monitoring – To monitor water stress, ie. the lack of water that the crop is exposed to during the growing season. And regardless of whether the crops are irrigated or not. Special colour map “Crop” and “CropStep” are available.
  • Manage irrigation management – Irrigation system optimization both in terms of determining suitable locations for the location of soil sensors and in terms of structure optimization. Special colour map “Water” and “WaterStep” for that application are available.
  • Phenotyping – Different plant varieties are susceptible to the amount of water available. The WIRIS Agro will help you determine how often the plants of a given species are in water stress, compared to plants of other species.
  • Biomass Cover Index – For realtime calculation of plant percentage on the field.


Crop drought – actual and real value

In the dry season what we are usually interested in is the actual effects of drought on crops. These impacts are not only dependent on the condition of the so-called climatic drought, but also on the groundwater drought, the size of the plant root system, etc. Measuring the water stress of plants with WIRIS Agro will help you to determine the actual and real effects of drought on the crop.


Comparison of CWSI and NDVI


Crop Water Stress Index



Normalized Differential Vegetation Index


Here you can download PDF document with full comparison of many other features of CWSI and NDVI.

YouTube video

Real-time evaluation

With WIRIS Agro you get actual values of crop water stress during the flight or you can use the collected data to create an overview map. By comparing yields from different months and years depending on water stress, a potential yield map can be created according to the current water stress value.

  • real-time onboard CWSI evaluation
  • real-time CROP and WATER colour map vizualization
  • real-time providing additional information on how the crop is really hit by drought
  • real-time Biomass cover index evaluation in %
  • real-time Picture-in-Picture CWSI index and RGB


YouTube video

Desktop Analysing Software CorePlayer for evaluation CWSI data

CWSI analysing software CorePlayer is a desktop software used for processing, analysing and exporting of CWSI RAW data images and videos. It allows to a user sets different parameters and models that are necessary for correct calculation of CWSI index or for later processing if the input data set to the camera needs to be adjusted.

For data processing to 2D or 3D vizualization can be also used the most common used SW tools such a Pix4D and Agisoft. Each image or video frame includes GPS information for processing.

The software is supplied free of charge to the WIRIS Agro.



Colour Map Overview

WIRIS Agro offers four different colourmaps. From the point of view of data and their processing it is not important which one of the colourmap you choose. In the application point of view a suitable palette choice can be very helpful.

Each colourmap in the WIRIS Agro camera is always defined in this way: the palette is black and white away from the value 0 (negative values below the range) and away from the value 100% (values above the range).



Biomass cover index

BCI (Biomass Cover index) is related to the evaluation of the mass of vegetation in the RGB scene. Based on data from the RGB camera, surfaces containing green vegetation are evaluated and the percentage of these areas is compared to other (non-vegetation) areas that are masked by white color in the RGB image. BCI is adjustable by simple thresholding by user.


Many interfaces

Workswell WIRIS Agro Pro also brings an interface enabling the widest range of connections to the drone, the control unit, an external GPS sensor etc. Wi-Fi low latency live video streaming and command link is also available. The following HW interfaces are available:

  • S.Bus
  • CAN bus (DJI M600 and A3 controller compatible)
  • Ethernet (RJ 45)
  • MavLink
  • external GPS connection
  • external trigger



128 GB SSD disk, external USB disk or microSD card

Workswell WIRIS Agro is equipped with an internal SSD disc with 128 GB memory for recording. It is also possible to save data to external USB disk or microSD card.


Weight and Dimensions

Workswell’s WIRIS Agro weighs less than 430 g, which is very convenient for drone usage.

WEIGHT: < 430 g
DIMENSIONS : 83 x 85 x 68 mm

Technical informationDocuments & Downloads
WIRIS Agro key features description
CWSI onboard processingEvaluation of Crop Water Stress Index (CWSI) onboard in real-time
Operating onboard systemCWSI OS for full real-time data streaming and evalution during the flight
– operating system ensures the full access to all camera functions
– easy camera control via S.Bus, CAN bus, MavLink, RJ-45 or Trigger
Biomass cover index in %Real-time percentage calculation of the mass of the vegetation in RGB
WIRIS Agro specification
Sensor resolution640 x 512 pixels
Real-time CWSI evaluationWorkswell patented WIRIS Agro technology based on crop water stress index (normalized to value from 0 to 1) brings information about the crop stress and crop water management on large areas. The information can then be used to determine yield maps, manage irrigation or implement water management related remedies.
FPA active sensor size1.088 x 0.8705 cm
Type of sensorLWIR band sensor
CWSI evaluation range0 – 100% (100% means very stressed)
Temperature sensitivity0.03 °C (30 mK)
Field of view of the lens45°
Color maps4 color maps for CWSI and Water management evaluation
CWSI range settingsAutomatic or manual
CWSI digital zoom1 – 14x continuous
Software CorePlayerYes, included in the package 2 licenses
3D mapping SW compatibilityAgrisoft and Pix4D
10x Optical zoom digital visual camera
Resolution1 920 x 1 080 pixels (Full HD),
1/3” sensor,
Auto white balance,
Wide dynamic range,
Backlight compensation,
Exposure and Gamma control
Optical zoom10x optical zoom with vibration compensation
View angleUltra zoom 6.9° – extra wide 58.2°, focal 33.0 mm – 3.3 mm
Biomass cover indexCalculation of the index in real-time with Threshold function
FocusAutofocus with Direct Focus Zoom synchronization
Memory and data recording
MemoryInternal high-speed SSD 128 GB for image and video recording
External slot for Micro SD card & USB 2.0 for USB stick for taking images
Image and video formatsCWSI JPEG images and Digital camera Full HD JPEG images
Digital camera h.264 encode video HD recording
Full-frame CWSI video recording (raw data recording)
GPS geo-tagging (image & video)
GPS tagging (image & video)MavLink or External GPS or DJI A3 controllers compatible via CAN bus
Interfaces & real-time remote control
10-pin digital portS.Bus
CAN bus (compatible with DJI M600 and A3 controllers)
External GPS connectivity
External trigger
Ethernet (RJ-45) portVideo streaming and camera control (optional on request only)
Micro USB 2.0 portMass storage
Camera control and video streaming (optional on request only)
USB 2.0 portKeyboard connection for in-house WIRIS camera control
Remote control systemCWSI OS ensures real-time control of all camera functions during the flight
Remote control optionsS.BUS protocol
CAN bus for real-time control on DJI M600 and GPS geo-tagging
RJ-45 for wireless uplink installation (video streaming and camera control)
Protective filter on lensFilter protects the lens against external damage during the flight
Camera functionsMeasurement functions:
– online CWSI evaluation including 4 different color maps
– spot CWSI evaluation (Centre) with temperature information
– biomass index evaluation in percentage in real-time
Periodic capturing:
– capturing CWSI image, CWSI video and Visible image simultaneously
Camera modes visualizationPicture-in-Picture, Full Screen RGB with segmentation, Dual-screen
Micro HDMI video output1 280 x 720 pixels (720p), Aspect ratio 16:9, Micro HDMI video output
Software & SDK
Desktop softwareAdvanced Workswell CorePlayer for offline CWSI data analysis
Power supply, weight & dimensions
Input supply voltage9 – 36 VDC, Coaxial 2 x 6.4 mm, outer shell – GND
Power dissipation (avg.)12 W
Weight< 430 grams
Dimensions (L x W x H)83 mm x 85 mm x 68 mm
Mounting2 x 1/4-20 UNC thread (1x bottom side, 1x upper side)
Housing materialDurable aluminium body for long-time measurement stability
Operating temperature range-10 °C to +50 °C
Storage temperature range-30 °C to +60 °C

WIRIS Agro documents

PDFDatasheet1.2 MBDownload

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