[pdal] How to generate a colored tif (RGB in 3 bands each) from colored las file

[Howard Butler]

No plans currently to implement multi-band output from writers.gdal. We would review a patch, but writers.gdal is already quite complicated and it is possible to construct what you want without any code changes, so it would have to be really compelling.

> On Sep 30, 2022, at 1:33 AM, Peter Lim <peter.lim at gpslands.com> wrote:
> 
> Thank you Howard & James!
> 
> Is there any plan to add in more options to writers.gdal to output such
> colored tif file...
> 
> 
> Thank you.
> 
> Best Regards,
> 
> Peter Lim
> GPS Lands (S) Pte Ltd
> 
> -----Original Message-----
> From: Howard Butler [mailto:howard at hobu.co]
> Sent: Wednesday, 28 September 2022 8:44 pm
> To: James Klassen
> Cc: Peter Lim; pdal
> Subject: Re: [pdal] How to generate a colored tif (RGB in 3 bands each) from
> colored las file
> 
> 
> 
>> On Sep 28, 2022, at 7:11 AM, James Klassen <klassen.js at gmail.com> wrote:
>> 
>> One idea, probably not optimal:
>> 
>> Use 3 writers.gdal stages and output each band to a different file.  Then
> use GDAL to assemble the three files into a single TIFF.  (gdalbuildvrt
> -separate, followed by gdal_translate to make a tiff from the VRT).
> 
> This is what I've done in the past, but one of the issues is PDAL's
> writers.gdal was interpolating using values outside the pixel, which is not
> ideal for picking pixel colors. For upcoming PDAL 2.5.0, we've added
> 'binmode' to writers.gdal [1], which will cause it to only consider points
> *inside* the pixel. This makes for better output in situations like this one
> (or making Intensity/Classification rasters).
> 
> Howard
> 
> [1] https://github.com/PDAL/PDAL/pull/3840=
> 
> 
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