[gdal-dev] gdal_translate differences between versions 3.4.3 and 3.5.1?

[Andrew C Aitchison]

On Tue, 26 Jul 2022, Matthew Savoie wrote:

> Hi all,
>
> I have noticed a difference in the output of gdal_translate between GDAL 3.4.3
> and 3.5.1 and I can't see in the changelog that I should see a difference.
> This is just a request to see if I missed something or if there might be change
> not described in gdal_translate between versions 3.4.3 and 3.5.1.
>
> I have a netcdf4/hdf5 file (test.nc) that I extract a variable and turn into a geotiff with the gdal_translate command:
>
>> `gdal_translate -a_srs EPSG:4326 NETCDF:"./test.nc":analysed_sst test_nc2tiff.tif`
>
> I have run this command with gdal 3.4.3 and gdal 3.5.1 and get different output files.

Can you compare the output of the two versions of gdalinfo ?
This should determine whether the difference is when reading or writing.

> The difference in the file metadata between the two versions is that using gdal
> 3.4.3: there is a value for `Origin` and `Pixel Size` and the Corner
> Coordinates are in Latitude and longitude.  When I use gdal 3.5.1 there are no metadata
> values for Origin or Pixel Size, and the Corner Coordinates look to be in grid
> cells.
>
> 3.4.3 output:
>   ...
>   Origin = (-179.995005493240370,89.994997863650838)
>   Pixel Size = (0.010000000152592,-0.009999999762615)
>   ...
>   Corner Coordinates:
>   Upper Left  (-179.9950055,  89.9949979) (179d59'42.02"W, 89d59'41.99"N)
>   Lower Left  (-179.9950055, -89.9949979) (179d59'42.02"W, 89d59'41.99"S)
>   Upper Right ( 180.0050000,  89.9949979) (180d 0'18.00"E, 89d59'41.99"N)
>   Lower Right ( 180.0050000, -89.9949979) (180d 0'18.00"E, 89d59'41.99"S)
>   Center      (   0.0049973,   0.0000000) (  0d 0'17.99"E,  0d 0' 0.01"N)
>   ...
>
> 3.5.1 output:
>   ...
>   Corner Coordinates:
>   Upper Left  (    0.0,    0.0)
>   Lower Left  (    0.0,17999.0)
>   Upper Right (36000.0,    0.0)
>   Lower Right (36000.0,17999.0)
>   Center      (18000.0, 8999.5)
>   ...
>
>   I'm wondering if this is a bug or a feature.  I'm happy to provide a sample file or admit my ignorance if I should have known this was a new change.
>
> Thanks,
>
> Matt Savoie
>
>

-- 
Andrew C. Aitchison                      Kendal, UK
                    andrew at aitchison.me.uk