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

&

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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)

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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)

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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

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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

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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)

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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

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5.ii First results - winter wheat (2015) -

• Impact of emergence date?

• RMSE = 0.84 ton/ha

• Satellite fCover • DHP fCover

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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; • …

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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.

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