[pdal] Clipping from multiple LAS tiles

[Andrew Bell]

On Mon, Oct 24, 2016 at 11:56 PM, Adam Steer <Adam.Steer at anu.edu.au> wrote:

> Hi PDAL Ninjas
>
> I’m wondering how we can replicate LAStool’s multi-tile clipping
> fiunction, eg: lasclip -i folder/*.las -poly polygon.shp -o newfile.las
>
> I’ve got a pretty clunky pipeline that works, based on the github pipeline
> examples:
>
> {
>     "pipeline": [
>         { "filename": "Merimbula2013-C3-AHD_7585912_55_0002_0002.las",
>           "tag": "A"
>         },
>         { "filename": "Merimbula2013-C3-AHD_7585914_55_0002_0002.las",
>           "tag": "B"
>         },
>         { "filename": "Merimbula2013-C3-AHD_7605914_55_0002_0002.las",
>           "tag": "C"
>         },
>         {
>             "inputs": ["A", "B", "C"],
>             "type": "filters.crop",
>             "polygon": "POLYGON((759094.480855234
> 5913008.2715937095,758464.6999094139 5912716.199270982,757743.6463627518
> 5912898.7444$
>             "outside": false
>         },
>         "./merimbulatown.las"
>     ]
> }
>
>
> …but would prefer to not have to list all my tiles. The obvious:
>

Unfortunately, you can't wildcard inputs to a reader at this time.
However, you also don't need the tags in your case.  All files listed
before filters get routed to the filter automatically:

{
    "pipeline": [
        "Merimbula2013-C3-AHD_7585912_55_0002_0002.las",
        "Merimbula2013-C3-AHD_7585914_55_0002_0002.las",
        "Merimbula2013-C3-AHD_7605914_55_0002_0002.las",
        {
            "type": "filters.crop",
            "polygon": "POLYGON((759094.480855234
5913008.2715937095,758464.6999094139
5912716.199270982,757743.6463627518 5912898.7444))
        },
        "./merimbulatown.las"
    ]
}

should work.  If you want the output from the three input files to be
separate, you can specify the output file as:

"./merimbulatown#.las"

Which should yield merimbulatown1.las, merimbulatown2.las and
merimbulatown3.las which correspond to the three input files.

-- 
Andrew Bell
andrew.bell.ia at gmail.com
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