LAI determination in forestry ecosystem by LiDAR data analysis

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Data analysis• A random re-sampling procedure of LiDAR data to estimate different laser points densitieswas performed (from a density of 2 pts/m 2 to 1 pts/100 m 2 ).R 2 1,000,890,900,850,890,790,800,840,700,710,680,700,650,730,57 0,610,600,530,500,550,490,400,410,30Constant radius (5 m)0,20Variable radius0,260,27Polynomial interpolation0,210,100,110,002 1 0,5 0,25 0,12 0,05 0,028 0,02 0,013 0,01Points density (pts/m2)The pattern of correlation coefficient(R 2 ) between measured LAI and LPIcalculated on the basis ofneighbourhood analysis performedusing a fixed radius (5 m) is reportedin blue.In this case, R 2 decreases very fast byreducing laser points density.To have a constant number of sampling points, a variable radius for each re-sampling wasused applying the equation:r = (150/πρπρ) ½where r is in meters, ρ is the points density (pts/m 2 ) and 150 is the number of points with aradius of 5 m and a points density of 2 pts/m 2 .-- Introduction -- The data --Methodology - Analysis - Conclusions --
Data analysis• The variation of R 2 for the correlation between LPI and LAI at different points densities.7,007,007,006,00y = -12,863x + 5,5919R 2 = 0,896,00y = -10,927x + 5,5815R 2 = 0,856,00y = -9,4221x + 5,5271R 2 = 0,795,005,005,00LAI4,003,00LAI4,003,00LAI4,003,002,001,00LPI = 0.192,001,00LPI = 0.242,001,00LPI = 0.290,000 0,02 0,04 0,06 0,08 0,1 0,12 0,14 0,16 0,18 0,2mean LPI0,000,00 0,05 0,10 0,15 0,20 0,25 0,30mean LPI0,000,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35mean LPI7,006,00y = -8,3121x + 5,4366R 2 = 0,707,006,00y = -7,5172x + 5,3531R 2 = 0,657,006,00y = -6,1567x + 5,3615R 2 = 0,685,005,005,00LAI4,003,00LAI4,003,00LAI4,003,002,001,00LPI = 0.332,001,00LPI = 0.382,001,00LPI = 0.450,000,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35mean LPI0,000,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40meanLPI0,000,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50mean LPI7,006,005,00y = -5,5628x + 5,2786R 2 = 0,537,006,005,00y = -7,3055x + 5,6896R 2 = 0,717,006,005,00y = -7,2738x + 5,6629R 2 = 0,57LAI4,003,00LAI4,003,00LAI4,003,002,001,00LPI = 0.452,001,00LPI = 0.412,001,00LPI = 0.370,000,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50mean LPI0,000,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45mean LPI0,000,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40mean LPI-- Introduction -- The data --Methodology - Analysis - Conclusions --
Page 3 and 4: The study sitePramosioconiferous fo
Page 5 and 6: Ground based: sample plot21 Km 2tra
Page 7 and 8: Airborne laser scanningLiDAR data w
Page 9 and 10: LiDAR penetration index (LPI)g ijLP
Page 11: LiDAR penetration indexLAI and LPI
Page 16 and 17: Conclusion• The significant linea

LAI determination in forestry ecosystem by LiDAR data analysis

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