Hi,
Anyway this would be more a topic for an issue at
https://github.com/opengeospatial/geotiff/issues . I've added a note
to the existing
https://github.com/opengeospatial/geotiff/issues/56#issuecomment-2039505940
Understood, but before jumping there with my opinionated ideas, let me
point out that the root of the problem is the TIFF6.0 standard that
continues to define field type 2 as ASCII. Their exact wording is:
"8-bit byte that contains a 7-bit ASCII code; the last byte must be NUL
(binary zero)" (page 15)
IMO everything would work just fine if this would be replaced with
"8-bit byte that contains UTF8 code units; the last byte must be NUL
(binary zero)". Given that UTF-8 is an extension of ASCII, backwards
compatibility wouldn't be so bad.
Mircea Neacsu
On 4/5/2024 6:59 AM, Even Rouault wrote:
Hi,
OGC GeoTIFF mostly formalizes the historical GeoTIFF 1.0 specification
from 1995, and UTF-8 at that time was still in its youth years. Not to
be mentioned that GeoTIFF was initially developed by NASA' JPL, so I
assume ASCII was good enough at that time for their purpose. As far as
I can see all EPSG CRS names as currently only use ASCII. It is true
though that WKT CRS potentially allows for more than ASCII for CRS
name, but only in the Latin1 character set.
Anyway this would be more a topic for an issue at
https://github.com/opengeospatial/geotiff/issues . I've added a note
to the existing
https://github.com/opengeospatial/geotiff/issues/56#issuecomment-2039505940
Even
Le 05/04/2024 à 12:44, Mircea Neacsu via PROJ a écrit :
Hello,
I had to read a bit deeper the Geo TIFF 1.1 standard and I was quite
surprised to see that in doesn't allow any character representation
outside the 7-bit ASCII text. Am I missing something?
In particular CitationGeoKeys that are mandatory in certain cases do
not allow for anything other than ASCII text. Seems a bit strange for
an international standard.
--
Mircea Neacsu
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