Breakline Mapping

[Michael Humphrey]

I am new to Python and I am having trouble with the breakline mapping in WBW Pro.

The error appears to related to the shapefile output. I tried to define the output file in a couple of different ways, but I am missing something.  I would appreciate any help. Thanks,

Here is the error and an example:

error: "thread '<unnamed>' panicked at 'Error adding part to ShapefileGeometry. Points and measures array must be equal length.', src\data_structures\shapefile\geometry.rs:503:13"

import whitebox_workflows as wbw
from whitebox_workflows import AttributeField, FieldData, FieldDataType, VectorGeometryType

wbe = wbw.WbEnvironment()
wbe.verbose = True
wbe.max_procs = -1
dem = wbe.read_raster('path to raster')
out_configs = wbe.read_vector('path to shapefile')
output1 = wbe.new_vector(VectorGeometryType.PolyLineZ, None, proj=out_configs.projection)
wbe.working_directory = 'path to directory'
print("Performing Feature Preserving Smoothing Tool")
wbe.breakline_mapping(
dem,
    threshold=3.0,
min_length=2
)
wbe.write_vector(output1, file_name='smooth.shp')

thread '<unnamed>' panicked at 'Error adding part to ShapefileGeometry. Points and measures array must be equal length.', src\data_structures\shapefile\geometry.rs:503:13

[Whitebox Geospatial Inc]

Hello Michael,

 

Your script has a few oddities with it. Can you try the following, being sure to update your working directory and DEM file names as appropriate:

 

import whitebox_workflows as wbw

 

wbe = wbw.WbEnvironment()

wbe.verbose = True

wbe.working_directory = 'path of working directory goes here'

 

dem = wbe.read_raster('name of raster file goes here')

output1 = wbe.breakline_mapping(

    dem,

    threshold=3.0,

    min_length=2

)

wbe.write_vector(output1, file_name='breaklines.shp')

 

Of particular note, unlike with WhiteboxTools, Whitebox Workflows for Python functions take in-memory data objects (in this case a raster) and output in-memory data objects (in this case a vector). I hope that helps to resolve your issue.

 

Regards,

 

John

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