Biomass Inversion Based on Geometric Information of Laser Point Cloud

Abstract

Crop biomass is the basis of crop yield formation, and accurate biomass information is of great significance to ensure national food security. Taking winter wheat as the research object, the airborne radar data and wheat biomass information were used to study the difference of biomass inversion in the vertical distribution of laser point cloud at different scanning angles. The vertical distribution of point clouds is of great difference at 30 m above ground and a scan angle of $\pm60^{\mathrm{o}}$ . There is no correlation between the vertical distribution of point clouds and the scan angle of $\pm 10^{\mathrm{o}}$ as a result of partial correlation analysis. Two lidar metrics (plot-level $\mathrm{H}_{\mathrm{mea}\mathfrak{n}}$ and $\mathrm{D}_{\mathrm{below}}$ ) is strongly related to field-measured biomass $(\mathrm{R}^{2}= 0.94,\mathrm{RMSE} =572.32\mathrm{kg}/\mathrm{ha}$ ) at a scan angle $\mathrm{of}\pm10^{\mathrm{o}}$ .