LiDAR data products, in the form of pre-processed x, y, z point cloud
files, were obtained from the Massachusetts Geographic Information
System (MassGIS) (Fig. 1B). The data products were delivered as three
geospatial layers representing first returns, last returns, and a bare
earth model. The data products are based on small footprint (1 m)
discrete return data, flown from aircraft during June of 2005 by 3Di
Technologies, Inc. Accuracies are reported as 50 cm on the horizontal
plane, and 15 cm in the vertical direction. Bare earth, first return and
last return point cloud data were interpolated to 1 m rasters for the
extent of the QuickBird dataset. A normalized digital surface model
(nDSM) was created by subtracting the bare earth model from the
first return layer. Fig. 1 shows spatial extent and site details for the
LiDAR and QuickBird datasets.
LiDAR data products, in the form of pre-processed x, y, z point cloudfiles, were obtained from the Massachusetts Geographic InformationSystem (MassGIS) (Fig. 1B). The data products were delivered as threegeospatial layers representing first returns, last returns, and a bareearth model. The data products are based on small footprint (1 m)discrete return data, flown from aircraft during June of 2005 by 3DiTechnologies, Inc. Accuracies are reported as 50 cm on the horizontalplane, and 15 cm in the vertical direction. Bare earth, first return andlast return point cloud data were interpolated to 1 m rasters for theextent of the QuickBird dataset. A normalized digital surface model(nDSM) was created by subtracting the bare earth model from thefirst return layer. Fig. 1 shows spatial extent and site details for theLiDAR and QuickBird datasets.
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