[pdal] filters.assign

[Peter Lim]

Hi Andrew,

 

May I know from which version can PDAl do math in an assignment.

 

I had tried to update/upgrade PDAL using:

conda update pdal

 

conda upgrade pdal

 

But it still gives me the same version.

 

Please advise.

 

 

Thank you.

 

Best Regards,

 

Peter Lim

GPS Lands (S) Pte Ltd

 

From: Andrew Bell [mailto:andrew.bell.ia at gmail.com] 
Sent: Wednesday, 18 August 2021 9:57 am
To: Peter Lim
Cc: pdal
Subject: Re: [pdal] filters.assign

 

Your version is too old. You can't do math in an assignment filter in version 2.1. Sorry.

 

On Tue, Aug 17, 2021 at 9:45 PM Peter Lim <peter.lim at gpslands.com> wrote:

Hi Andrew,

I’ve tried what you have suggested:

[

    {

        "type":"readers.las",

        "filename":"input.las"

    },

    {

        "type":"filters.assign",

        "value":"IntnstySqRt = Intensity / 256"                                   

    },

    ...

 

 

But it gives this error:

PDAL: filters.assign: Unexpected argument 'value'.

 

I’m using PDAL 2.1.0 (git-version: Release) in Windows 10.

 

Pls. advise.

 

Thank you.

 

Best Regards,

 

Peter Lim

 

From: Andrew Bell [mailto:andrew.bell.ia at gmail.com] 
Sent: Wednesday, 18 August 2021 9:40 am
To: Peter Lim
Cc: pdal
Subject: Re: [pdal] filters.assign

 

Sorry, I had a typo. It should have been "value" instead of "assignment":


[

    {

        "type":"readers.las",

        "filename":"input.las"

    },

    {

        "type":"filters.assign",

        "value":"IntnstySqRt = Intensity / 256"                                   

    },

    ...

 

 

On Tue, Aug 17, 2021 at 9:35 PM Peter Lim <peter.lim at gpslands.com> wrote:

Hi Andrew,

 

I’ve tried what you have suggested:

[

    {

        "type":"readers.las",

        "filename":"input.las"

    },

    {

        "type":"filters.assign",

        "assignment":"IntnstySqRt = Intensity / 256"                                   

    },

    {

        "type":"writers.gdal",

        "resolution": 0.05,

        "data_type":"uint8",

        "output_type":"mean",

         "dimension":"IntnstySqRt",

        "gdalopts":"COMPRESS=JPEG,PHOTOMETRIC=YCBCR,BLOCKXSIZE=4096,BLOCKYSIZE=4096,GDAL_CACHEMAX=8000,NUM_THREADS=ALL_CPUS,TILED=YES",                

        "bounds":"([19370,20527],[39571,40865])", 

        "filename":"output.tif"

    }                          

]

But is giving same error:
PDAL: filters.assign: Invalid value for argument 'assignment'.

Please advise.

 

Thank you.

 

Best Regards,

 

Peter Lim

GPS Lands (S) Pte Ltd

 

From: Andrew Bell [mailto:andrew.bell.ia at gmail.com] 
Sent: Tuesday, 17 August 2021 7:14 pm
To: Peter Lim
Cc: pdal
Subject: Re: [pdal] filters.assign

 

You're mixing syntax for the older "assignment" option with that of the newer "value" option.

 

Try this:

 

[

    {

        "type":"readers.las",

        "filename":"input.las"

    },

    {

        "type":"filters.assign",

        "assignment":"IntnstySqRt = Intensity / 256"                                   

    },

    ...

 

On Tue, Aug 17, 2021 at 6:09 AM Peter Lim <peter.lim at gpslands.com> wrote:

Hi,

 

I’m trying to generate a GeoTiff image from a LAS file using the sq. root of Intensity dimension and the pipeline as follows:

 

[

    {

        "type":"readers.las",

        "filename":"input.las"

    },

    {

         "type": "filters.ferry",

         "dimensions":"Intensity=>IntnstySqRt"

    },                                                         

    {

        "type":"filters.assign",

        "assignment":"IntnstySqRt[:] = IntnstySqRt / 256"                                    

    },

    {

        "type":"writers.gdal",

        "resolution": 0.05,

        "data_type":"uint8",

        "output_type":"mean",

         "dimension":"IntnstySqRt",

        "gdalopts":"COMPRESS=JPEG,PHOTOMETRIC=YCBCR,BLOCKXSIZE=4096,BLOCKYSIZE=4096,GDAL_CACHEMAX=8000,NUM_THREADS=ALL_CPUS,TILED=YES",                

        "bounds":"([19370,20527],[39571,40865])", 

        "filename":"output.tif"

    }                          

]

 

However, error occurred:

PDAL: filters.assign: Invalid value for argument 'assignment'.

 

Is it the correct use of filters.ferry and filters. assign…

 

Please advise.

 

 

Thank you.

 

Best Regards,

 

Peter Lim

GPS Lands (S) Pte Ltd

 

 


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-- 

Andrew Bell
andrew.bell.ia at gmail.com




 

-- 

Andrew Bell
andrew.bell.ia at gmail.com




 

-- 

Andrew Bell
andrew.bell.ia at gmail.com



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