filters.smrf¶
Filter ground returns using the Simple Morphological Filter (SMRF) approach outlined in [Pingel2013].
[Pingel2013] | Pingel, T.J., Clarke, K.C., McBride, W.A., 2013. An improved simple morphological filter for the terrain classification of airborne LIDAR data. ISPRS J. Photogramm. Remote Sens. 77, 21–30. |
Example¶
The sample pipeline below uses filters.smrf
to segment ground and non-ground
returns, writing only the ground returns to the output file.
{
"pipeline":[
"input.las",
{
"type":"filters.smrf"
},
{
"type":"filters.range",
"limits":"Classification[2:2]"
},
"output.laz"
]
}
Options¶
- cell
- Cell size. [Default: 1.0]
- cut
- Cut net size (
cut=0
skips the net cutting step). [Default: 0.0] - dir
- Optional output directory for debugging intermediate rasters.
- scalar
- Elevation scalar. [Default: 1.25]
- slope
- Slope (rise over run). [Default: 0.15]
- threshold
- Elevation threshold. [Default: 0.5]
- window
- Max window size. [Default: 18.0]