[gdal-dev] gdal2tiles for floating point images

[Michael Sumner]

Ok so my naive edits are clearly not enough, they still get written as Byte
so it's deeper in the target spec and spread across a few places I'm not
ready to get across yet.

Happy to pursue in the longer term though.

Cheers, Mike


On Tue, Apr 30, 2024 at 7:00 AM Michael Sumner <mdsumner at gmail.com> wrote:

>
>
> On Fri, Apr 26, 2024 at 5:37 AM lefsky--- via gdal-dev <
> gdal-dev at lists.osgeo.org> wrote:
>
>> I'd like to have a version of gdal2tiles that handles image types other
>> than uint8. Is there a reason why it doesn't handle those types of images?
>> It appears I'd have to modify the output format from png to tiff.  I have
>> never modified gdal source before and I'm wondering if this modification
>> (which appears straightforward to a naive user) hasn't been done before.
>>
>
>
> Hello, it appears to be sufficient to add GTiff to tiledriver options,
> handle the file extension, and add an option to override the error/message
> that advises conversion to Byte:
>
>
> https://github.com/OSGeo/gdal/compare/master...dis-organization:gdal:gdal2tiles-nonbyte
>
> I wanted this myself as I'm working on a version of the tiling in an R
> package, and I'm not confident enough about it without being able to
> compare to gdal2tiles.py.
>
> It will need care to prepare it and merge into GDAL itself, with some
> thought about documentation, implications for html output (it's compleltely
> incompatible with the html produced I expect), and tests, but if you want
> to use it locally it seems ok and I'm happy to follow up off-list.
>
> Note that you can use VRT to reference such a tiled output for numeric
> data, I used it for a tiled global elevation source here (so if we fold
> this into GDAL that could be a nice option to include, VRT for reading as
> TMS):
>
> https://github.com/hypertidy/sds/blob/main/R/sources.R#L41
>
> Cheers, Mike
>
>
>
>
>>
>> Michael
>>
>>
>> --
>> Michael Lefsky (He/His)
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>>
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>
>
> --
> Michael Sumner
> Software and Database Engineer
> Australian Antarctic Division
> Hobart, Australia
> e-mail: mdsumner at gmail.com
>


-- 
Michael Sumner
Software and Database Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsumner at gmail.com
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