Hello !
I am working with georeferenced LiDAR data with R and sp. I am trying to
normalize height and remove the slope effect from a Terrestrial Laser
Scanner (TLS) point cloud.
The available data is :
- a TLS point cloud in ASCII format converted to sp objet of class
SpatialPoint (variable named "tls.z.sp")
- a raster DTM in TIF format (1 m resolution) converted to sp
object of class SpatialGridDataFrame (variable named "tls.dtm$z")
The method consists in subtracting the DTM z value from each TLS point z
value. I proceeded to some tests with the "over()" function with :
x = "SpatialPoints"
y = "SpatialGridDataFrame"
nz <- over(tls.z.sp, tls.dtm$z, tls.z.sp-tls.dtm$z)
I am not sure to be on the right track. Any suggestion would be very much
appreciated !
Cheers,
Nathalie
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