writers.derivative¶
The Derivative Writer supports writing of primary topographic attributes.
Example #1¶
Create a single GeoTIFF with slope values calculated using the D8 method.
{
"pipeline":[
"inputfile.las",
{
"type":"writers.derivative",
"filename":"outputfile.tiff",
"primitive_type":"slope_d8"
}
]
}
Example #2¶
Create multiple GeoTIFFs containing slope, hillshade, and contour curvature values.
{
"pipeline":[
"inputfile.las",
{
"type":"writers.derivative",
"filename":"outputfile_#.tiff",
"primitive_type":"slope_d8,hillshade,contour_curvature"
}
]
}
Options¶
- filename
- GeoTiff file to write. [Required]
- primitive_type
Topographic attribute to compute. [Default: slope_d8]
- slope_d8
- slope_fd
- aspect_d8
- aspect_fd
- contour_curvature
- profile_curvature
- tangential_curvature
- total_curvature
- hillshade
- edge_length
- Size of grid cell in X and Y dimensions using native units of the input point cloud. [Default: 15.0]
- altitude
- Illumination altitude in degrees (hillshade only). [Default: 45.0]
- azimuth
- Illumination azimuth in degrees (hillshade only). [Default: 315.0]