Geoscience Reference
In-Depth Information
The next stage attributes the point with their height above the ground surface
by interpolating from the neighboring ground returns the ground elevation directly
beneath the return for which the height is being calculated. In this case the natural
neighbor algorithm is used for the interpolation.
spddefheight --interp -c 50 -r 50 --in NATURAL_NEIGHBOR -i
LiDAR_10m_pmfmccgrd.spd -o LiDAR_10m_pmfmccgrd_h.spd
--interp
Use interpolation of the ground returns to calculate ground elevation.
-c 50
Number of columns within a block is 50.
-r 50
Number of rows within a block is 50.
--in NATURAL_NEIGHBOR
The interpolator to be used is natural neighbor.
-i LiDAR_10m_pmfmccgrd.spd
Name of the input SPD point dataset.
-o LiDAR_10m_pmfmccgrd_h.spd
Name of the output SPD point dataset containing heights.
18.3 Interpolate Points to Raster Format
To interpolate raster surfaces from the classification point cloud, the spdinterp
command is used. Again the natural neighbor interpolation algorithm is used and
here the output pixel size is set to be 1 m (using the -b option). In this particular
example, just a DTM and CHM are produced but a DSM could also be interpolated
if required. The raster input and output is performed using GDAL so all formats
supported by your installed version of GDAL are supported (e.g. GTIFF or HFA or
ENVI).
spdinterp --dtm --topo -r 50 --overlap 10 --in NATURAL_NEIGHBOR
-f GTIFF -b 1 -i LiDAR_10m_pmfmccgrd_h.spd -o
LiDAR_1m_pmfmccgrd_dtm.tif
spdinterp --chm --height -r 50 --overlap 10 --in
NATURAL_NEIGHBOR -f GTIFF -b 1 -i
LiDAR_10m_pmfmccgrd_h.spd -o LiDAR_1m_pmfmccgrd_chm.tif
--dtm
Interpolate a digital terrain model ( chm for canopy height model).
 
 
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