[pdal] filter non-ground points using "filters.range"

[thejus kambi]

Hello,

I am trying to get all the non- ground points into a different file. I am
using the below json. However, I found all the ground points also included
in the output.

[
"test_part.las",
{
      "type":"filters.range",
      "limits":"Classification![2:2]"
    },
{
        "type":"writers.las",
        "filename":"test_part_nonground.las"
    }
]

Could someone please explain what I am doing wrong?

Warm Regards,
Thejus
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