PDAL Filter output is same as input file

Question

I've applied SOR filter using PDAL python.Below is the code snippet of the same,

json =  
 """  
{  
  "pipeline":[  
    "D:/Lidar_collect_3/output/output_1.las",  
    {  
      "type":"filters.outlier",  
      "method":"statistical",  
      "mean_k":6,  
      "multiplier":1.0  
    },  
    "D:/Lidar_collect_3/output/output.las"  
  ]  
}  
"""

pipeline = pdal.Pipeline(json)  
pipeline.validate()  
pipeline.execute()

The output.las created has the same number of points as input(looks same as the input). I've tried with different mean_k and multiplier values, but no result.

Where did I go wrong ?

Charlie Parr · Answer

I think your json is being interpreted as a string rather than as a json object.
Try importing the json library (part of the standard Python library) and then loading the string as a json object. For example:

import json
json_string = """  
{  
  "pipeline":[  
    "D:/Lidar_collect_3/output/output_1.las",  
    {  
      "type":"filters.outlier",  
      "method":"statistical",  
      "mean_k":6,  
      "multiplier":1.0  
    },  
    "D:/Lidar_collect_3/output/output.las"  
  ]  
}  
"""

json_pipeline = json.loads(json_string)
pipeline = pdal.Pipeline(json_pipeline)  
pipeline.validate()  
pipeline.execute()

PDAL Filter output is same as input file

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