29 June 2017 – Bruges – Belgium 19th International Workshop on the Analysis of Multitemporal Remote Sensing Images Hamid SALLAH & Joost WELLENS
Assessment of AquaCrop for maize and winter wheat using satellite derived fCover data
… « back to the future » - and beyond -
↗ temporal resolution; ↘ spatial resolution; Composited images.
↗ temporal resolution; ↗ spatial resolution; Composited images.
Crop growth model
&
1 / 10
2016 Feb. March
Apr. May June
July August Sept.
Oct. Nov. Dec.
1 Regional (coarse) crop monitoring - curve fitting -
- MODIS; - GAI temporal profiles.
(‘green area index’)
Shape of decreasing curve of green area index
~ Regional wheat yield
(L. Kouadio et al., 2012)
2 / 10
2 Regional (detailed) crop monitoring - 10-daily data ? -
08/05/2016 18/05/2016 28/05/2016 07/06/2016
27/06/2016 07/07/2016 17/07/2016 27/07/2016
06/08/2016 16/08/2016 26/08/2016 05/09/2016
(I. Piccard et al., 2016)
3.i AquaCrop (FAO) - filling the gaps and more -
- ‘Conservative’ crop-file; -Field level; -Root and tuber crops; Fruit/grain producing crops; Leafy vegetable crops.
Calibration / Validation: minimise observations ↔ simulations
(fCover & biomasse)
4 / 10
3.ii AquaCrop - a model can ‘see daily’ -
Graph: - evolution; - canopy growth & decline; - phenological stages.
16 May
Field observations
Drone (2 cm res.)
Deimos-1 (22 m res.)
27 May
6 June
17 July fCover [%]
10 30
100
5 / 10
3.iii AquaCrop - a model can ‘see further’ -
simple &
solid
B = WP · ΣTr or Biomass = Water productivity · Sum of transpiration Y = HI · B or Yield = Harvest index · Biomass
6 / 10
4 Sentinels & models - parcel/regional level -
field level
soil
climate
crop DB
regional level
assimilation
satellite data
Field data/observations: - location; - planting date; - planting density; - observations; - …
yield estimation/forecast
interactive platform
(adapted from Delécolle et al., 1992)
7 / 10
5.i First results - maize (2015) -
• Impact of emergence date? Impact of variety?
• Late anti-herbicides application • RMSE = 1.50 ton/ha • Satellite fCover
• DHP fCover
8 / 10
5.ii First results - winter wheat (2015) -
• Impact of emergence date?
• RMSE = 0.84 ton/ha
• Satellite fCover • DHP fCover
9 / 10
6 Some references - ongoing projects/research -
: maize, winter wheat and potatoes; : wheat and sugar beet; : rice and sugar cane; : durum wheat; : sorghum.
• fertilizer impact; • emergence date retrieval; • …
10 / 10
www.eed.ulg.ac.be
Thnank you! Prof. B. Tychon &
A. Denis, H. Jupsin, O. Durgun, M. El Jarroudi, I. Jacquemin,
M. Lang, J. Minet, P. Ozer, S. Palé, M.T. Sall, H. Sallah, K., Sossey,
J. Wellens, F. Zouhir.
12
