Digital Terrain Model (DTM)
----------------------------

input data: "ground points" derived from denoised ALS point cloud
data format: LAS
coordinate system: ETRS89 UTM Zone 32N
number of points: 106 247 397

"Ground points" were created using "lasground" tool (LAStools softvare). 
Denoised ALS data were used as input data and the processing parameters were set as follows:
check "nature", check "cumpute height", output format "LAS".
Some points representing buildings and vegetation had to be removed manually using "Sgment" tool 
in CloudCompare software.


DTM processing software: "blas2dem" tool (LAStools software)
processing parameters: step "0.05 m", item "elevation", output format ".tif"

output data: raster DTM
data format: .tif
coordinate system: ETRS89 UTM Zone 32N
spatial resolution: 0.05 m