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79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
import os
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import subprocess
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def call_lastools(tool_name, las_in, las_out=None, args=None, verbose=True):
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"""Send commands to the lastools library.
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Requires lastools in system path.
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Args:
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tool_name: name of lastools binary
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las_in: bytes from stdout, or path to input point cloud
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las_out: '-stdout' to pipe output, or path to output point cloud
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args: list of additional arguments, formatted for lastools
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verbose: show all warnings and messages from lastools (boolean)
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Returns:
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bytes of output las, if las_out='-stdout'
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None, if las_out='path/to/las/file'
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Examples:
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# Convert xyz file to las and pipe stdout to a python bytes object
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las_data = call_lastools('txt2las', las_in='points.xyz', las_out='-stdout',
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args=['-parse', 'sxyz'])
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# Clip las_data with a shapefile, and save to a new las file
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call_lastools('lasclip', las_in=las_data, las_out='points.las',
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args=['-poly', 'boundary.shp'])
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"""
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# Start building command string
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cmd = [tool_name]
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# Parse input
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if type(las_in) == bytes:
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# Pipe input las bytes to stdin
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cmd += ['-stdin']
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stdin = las_in
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else:
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# Load las from file path
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cmd += ['-i', las_in]
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stdin = None
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# Parse output
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if las_out == '-stdout':
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# Pipe output las to stdout
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cmd += ['-stdout']
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elif las_out:
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# Save output las to file
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cmd += ['-o', las_out]
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# Append additional lastools arguments, if provided
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if args:
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cmd += args
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process = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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stdin=subprocess.PIPE)
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stdout, stderr = process.communicate(input=stdin)
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# Handle errors, if detected
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if process.returncode != 0:
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print("Error: {} failed on {}".format(tool_name,
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os.path.basename(las_in)))
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print(stderr.decode())
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elif verbose:
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# Print addional messages if verbose mode is being used
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print(stderr.decode())
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# Output piped stdout if required
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if las_out == '-stdout':
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return stdout
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else:
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return None
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