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Academic year: 2021

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Ground based photogrammetry to assess herbaceous biomass in Sahelian rangelands

M. Bossoukpe, O. Ndiaye, S. Diatta, O. Diatta, A.A. Diouf, M.H. Assouma, E. Faye, S. Taugourdeau simon.taugourdeau@cirad.fr

One video(1080P) of the 1m²

Video split into around 300 images Use of Pix4D software (structure from motion) • Volume • Color (Red-Blue-Green) • Vegetation indexes PLS with field biomass and 3D variable R²=0.55, Q² drymass=0.60 General concept

• Question: Can we use photogrammetry to assess the herbaceous biomass with digital RGB camera? • Structure-from-motion: 3D model built from a set of images with different points of view.

• Field measures: Video and herbaceous biomass sampling within 36 plots of 1m*1m² in Sahelian

rangelands of Northern Senegal (350±130 mm of annual rainfall , sandy soil , annual herbaceous cover).

Conclusion

• Ground based photogrammetry is a interesting tool to monitored biomass.

• This technic could be used to develop herbaceous growth observatory at the national scale.

3D model of the herbaceous Methodology

DM Drymass, FMS Fresh mass, NRBDI Normalized difference between red and blue, NGBDI ND between green and blue, NGRDI between green and red

Références

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