Hi Vicent,
Since the SetNoDataValue and GetNodataValue is based on the limitation of
GeoTiff I would not expect DeleteNoDataValue to be any different. For example,
there is no way to set/get NoData for individuals bands, there is no way to
set/get an array of NoData values or NoData value ranges. For drivers that
support such thinks, the DeleteNoDataValue will probably delete all NoData
values from the dataset.
But that is something that can't be resolved by the RFC 58. I think.
Very often, I find unsigned 8 bit images with absurd NoData value, like -9999.
That is probably a software specific flag value. The problem is that in
gdal_translate there is no option to prevent that NoData to be passed from one
format to another. So I am about to implement a value range check on the
CreateCopy to avoid that.
Would that be feasible to accept the option "-a_nodata NO" on GDAL command
lines, to indicate that NoData should not pass from the input to the output
dataset?
Best regards,
Ivan
Date: Tue, 19 May 2015 08:50:50 +0200
From: sc...@sarvision.nl
To: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] RFC 58: Removing Dataset Nodata Value
On 05/18/2015 08:37 PM, Sean Gillies wrote:
Hi all,
In consultation with Even Rouault, I've written up RFC 58.
https://trac.osgeo.org/gdal/wiki/rfc58_removing_dataset_nodata_value
The gist of it: allowing deletion of a nodata value defined
for a dataset, thereby rendering all pixels valid without
copying data to a new file.
I'd love your feedback and thumbs up or thumbs down on this
RFC. Thanks,
As daily users of gdal me and my collegues would like to give this a
very big thumbs up. We've really been missing this. Thanks a lot for
starting this RFC.
Vincent.
--
Sean Gillies
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