How to use the pdal.pio.filters.range function in pdal
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PDAL / python / test / test_pio.py View on Github 
def test_pipeline_construction(self):
pipeline = (pio.readers.ply(filename="dummyinput.ply") +
pio.filters.outlier(method="statistical", mean_k=16, multiplier=1.0) +
pio.filters.range(limits="Classification![7:7]") +
pio.filters.normal() + pio.writers.ply(storage_mode="ascii", precision=4, filename="dummyoutput.ply",
dims="X,Y,Z,Red,Green,Blue,NormalX,NormalY,NormalZ"))
self.assertIsInstance(pipeline, pio.PipelineSpec)
self.assertEqual(len(list(pipeline.stages)), 5)
self.assertEqual(json.dumps(pipeline.spec, indent=2), dummy_pipeline)
auto_reader = pio.readers.auto(filename="dummyinput.las")
auto_writer = pio.writers.auto(filename="dummyoutput.las")
self.assertIn("filename", auto_reader.spec)
self.assertNotIn("type", auto_reader.spec)
self.assertIn("filename", auto_reader.spec)
self.assertNotIn("type", auto_writer.spec)
self.assertEqual(auto_reader.prefix, "readers")
self.assertEqual(auto_writer.prefix, "writers")
