Use of remote sensing data to
determine stress factors for the SALUS
model
1URS SCHULTHESS 2ZIA UDDIN AHMED
3JOE T. RITCHIE
1,2 CIMMYT Bangladesh, House 10/B, Road 53, Gulshan 2, Dhaka
1215, Bangladesh
3 Professor Emeritus, Homer Nowlin Chair, Michigan State University, East Lansing, MI 48823,
Forcing of a crop simulation model with
ground cover derived from remote sensing
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Stress detection with remote sensing
• Thermal data for water stress
• Optical data
– NDVI
• GreenSeeker & GreenSat, use of a well fertilized reference strip
– Red-edge based indices for chlorophyll status
– Fluorescence for rate of photosynthesis, RUE
– Photochemical reflectance index (PRI) for rate of
photosynthesis, RUE
Model for irrigation scheduling
Ground Cover (%) from remote sensing
Daily Weather • Tmax • Tmin • Solar radiation • Precipitation
Forecasted irrigation need
(yes/no)
Water table depth
MODEL
RGB Sony NEX-7
Wavelength
(nm)
1 ILS -
2 Green 525-535
3 Red 675-685
4 Red-edge1 705-715
5 Red-edge2 735-745
6 NIR 795-805
Channel Name
MiniMCA (Tetracam)
Thermal camera Optris PI 400
Altitude(m) RGB MiniMCA Thermal
15 0.3
65 1.2 12
100 5
Resolution(cm)
Ground cover and canopy temperature on
March 27
Dry Wet Intermediate
Dry
Dry
Wet
Wet
Intermediate
Intermediate
Temperature reduction factor to control leaf
expansion
trfegro.dat 7 -99 0 6 0 8 0.05 23 1 34 1 43 0 99 0
Photochemical reflectance index (PRI)
Source: Peñuelas, Josep, Martin F. Garbulsky, and Iolanda Filella. "Photochemical reflectance index (PRI) and remote sensing of plant CO2 uptake." New Phytologist 191.3 (2011): 596-599.
Leaf Size Analysis: Length and width measured with
Google SketchUp: https://www.sketchup.com/de
Examples of PRI/NDVI vs Leaf Area
(individual leaf)
Barisal, March 12 Leaf Area [cm2] = 172.85249 + 10.113794*PRI/NDVI R2 = 0.54
Kalapara, Feb 28 Leaf Area [cm2] = 148.73649 + 6.9412593*PRI/NDVI R2 = 0.48
Examples of PRI/NDVI vs Leaf Area
(individual leaf)
Kalapara, March 13 Leaf Area [cm2] = 329.79811 + 6.8204081*PRI/NDVI R2 = 0.36
Patuakhali, March 14 Leaf Area [cm2] = 210.53355 + 1.9893104*PRI/NDVI R2 = 0.14
Prediction of relative leaf size as function of
(PRI/NDVI). Each point represents the average
measured at a given acquistion date
Y = 0.83 + 0.53*x R2 = 0.55 Y = 0.83 + 0.68*x R2 = 0.37
Recommended reading
• Magney, T.S., Vierling, L.A., Eitel, J.U.H., Huggins,
D.R., Garrity, S.R., 2016. Response of high
frequency Photochemical Reflectance Index (PRI)
measurements to environmental conditions in
wheat. Remote Sens. Environ. 173, 84-97.
•
…. At last, dancing in the rain
With great support from: Amirul Islam, Mohamed Atikuzzamman, Mustafa Kamal, Rokon Golam Morshed, Saiful Azim, Shah Al Emran and Shahidul Islam