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Forest LiDAR Analysis Alexis Demitroff
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Penn Swamp Penn Swamp is part of Shamong, NJ
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Part 1 QT Modeler A total of 5 plots were analyzed
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PennEnclosedALLshape Cross sections of the plot were taken with 2.5m width and 10m apart
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PennEnclosedALLshape Using Delunay Triangulation, the canopy height of the plot was determined to be 9.54m
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PennmaturecedarEnclosedshape Cross sections of the plot were taken 2.5m width spaced 10m apart
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PennmaturecedarEnclosedshape Using delunay triangulation, the height of the canopy was determined to be 24.10m
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PennSwampEnclosedLatinSQshape Cross sections of the plot were taken 2.5m width and 10m apart
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PennSwampEnclosedLatinSQshape Using delunay triangulation, the height of the canopy was determined to be 11.10m
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PennSwampUnenclosedLatinSQShape Cross sections of the plot were taken 2.5m apart spaced 10m apart
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PennSwampUnenclosedLatinSQShape Using delunay triangulation the height of the canopy was determined to be 7.59m
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PennUNenclosedshape Cross sections of the plot were taken 2.5m and 10m apart
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PennUNenclosedshape Using delunay triangulation, the height of the canopy was determined to be 8.31m
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Part 2 ArcMap
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Sample plot areas The forest was classified based on ground, high, medium and low growth.
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PennmaturecedarEnclosedshape
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Overview Study DSM (digital surface model) is used to estimate the tree canopy level of Penn Swamp in Shamong, NJ. Variability across 5 plots will be analyzed with attention to tree height and density. Airborne LiDAR will provide the data for the study from the USGS “click” site. Method and Analysis Because different layers of analysis are to be used, 4 layers were imported into QT Modeler: both first return and ground layers for surface models (qtt) and point clouds (qtc). A mensuration line was created across each of the 5 study plots with cross sections taken on both sides. This is where a delunay triangle was created to determine canopy height. A Canopy Height Model was created by subtracting the highest point in the plot from the lowest point in the plot. This determined the estimate of canopy height and interpolated missing points for the plot. Forest height classification was performed in ArcMap.
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Results Cross sections of “ PennEnclosedALLshape” were taken 2.5m width and 10m apart. Using Delunay Triangulation, the canopy height of the plot was determined to be 9.54m. Cross sections of “PennmaturecedarEnclosedshape” were taken 2.5m width spaced 10m apart. Using delunay triangulation, the height of the canopy was determined to be 24.10m. Cross sections of “PennSwampEnclosedLatinSQshape” were taken 2.5m width and 10m apart. Using delunay triangulation, the height of the canopy was determined to be 24.10m. Cross sections of “PennSwampEnclosedLatinSQshape” were taken 2.5m width and 10m apart. Using delunay triangulation, the height of the canopy was determined to be 11.10m. Cross sections of “PennUNenclosedshape “ were taken 2.5m and 10m apart. Using delunay triangulation, the height of the canopy was determined to be 8.31m. For the Arc Map analysis, each plot vegetation was classified on ground, high, medium, and low vegetation. It can be concluded that the ground is probably swamp. The maturecedarEnclosedShape plot was classified separately.
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