pdal translate ./exercises/analysis/ground/CSite1_orig-utm.laz \
-o ./exercises/analysis/ground/denoised-ground-only.laz \
outlier smrf range  \
--filters.outlier.method="statistical" \
--filters.outlier.mean_k=8 --filters.outlier.multiplier=3.0 \
--filters.smrf.ignore="Classification[7:7]"  \
--filters.range.limits="Classification[2:2]" \
--writers.las.compression=true \
--verbose 4