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Authentication-Results: mx201.skynet.be; dkim=none (message not signed) header.i=none; spf=None smtp.pra=tiff-bounces@lists.osgeo.org; spf=Pass smtp.mailfrom=SRS0=Mdwf=VU=lists.osgeo.org=tiff-bounces@osgeo.org; spf=PermError smtp.helo=postmaster@lists.osgeo.org
Received-SPF: None (mx201.skynet.be: no sender authenticity
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  envelope-from="SRS0=Mdwf=VU=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-sender="tiff-bounces@lists.osgeo.org";
  x-conformance=sidf_compatible
Received-SPF: Pass (mx201.skynet.be: domain of
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  x-sender="SRS0=Mdwf=VU=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text="v=spf1 mx a:mail.osgeo.org a:lists.osgeo.org
  a:mail.osgeo.osuosl.org ip4:140.211.15.3 a:osgeo7.osgeo.org
  a:trac.osgeo.org a:dev.trac.osgeo.org
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  envelope-from="SRS0=Mdwf=VU=lists.osgeo.org=tiff-bounces@osgeo.org";
  x-sender="postmaster@lists.osgeo.org";
  x-conformance=sidf_compatible; x-record-type="v=spf1";
  x-record-text=""
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From: "Simon (Vsevolod) Ilyushchenko" <simonf@simonf.com>
Date: Thu, 12 May 2022 14:58:50 -0700
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To: Even Rouault <even.rouault@spatialys.com>
Subject: Re: [Tiff] best tiff tag names for start and end datetimes?
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On Thu, May 12, 2022 at 2:50 PM Even Rouault <even.rouault@spatialys.com>
wrote:

>
> 3. Even: yes, I'm not quite sure whether this should be handled on GDAL or
> TIFF level. Other GDAL-readable format like netcdf-cf have time standards
> already, but yes, geotiffs (and lately COGs = cloud-optimized geotiffs
> <https://www.cogeo.org/>) are the lingua franca of our community.
> Setting GDAL fields START_DATE and END_DATE indeed feels like a good
> solution, so I wanted to find out how to do this properly in the hope of
> creating a standard.
>
> It could certainly be good to have a standard for such metadata items for
> TIFF that apply in the Earth Observation domain, and would be the
> equivalent of netcdf-cf conventions, or maybe porting fields from STAC (
> https://stacspec.org/). Unfortunately the TIFF tag mechanism is hard to
> make evolve given that it implies a registry to attribute a code for a
> tag/key and an entity that takes care of doing that, which no longer
> happens those past years. Hence my suggestion to have that at the GDAL
> level.  There's also the
> https://www.awaresystems.be/imaging/tiff/tifftags/geo_metadata.html tag
> used by the DGIWG community, to put XML ISO metadata in it, but that's
> going into complex metadata system.
>

Alright - what's the next step in making these GDAL tags more official?

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Thu, May 12, 2022 at 2:50 PM Even =
Rouault &lt;<a href=3D"mailto:even.rouault@spatialys.com">even.rouault@spat=
ialys.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">
 =20
   =20
 =20
  <div>
    <blockquote type=3D"cite">
      <div dir=3D"ltr"><br>
        <div>3. Even: yes, I&#39;m not quite sure whether this should be
          handled on GDAL or TIFF level. Other GDAL-readable format like
          netcdf-cf have time standards already, but yes, geotiffs (and
          lately COGs =3D <a href=3D"https://www.cogeo.org/" target=3D"_bla=
nk">cloud-optimized geotiffs</a>) are the
          lingua franca of our community.=C2=A0 Setting GDAL fields
          START_DATE and END_DATE indeed feels like a good solution, so
          I wanted to find out how to do this properly in the hope of
          creating a standard.</div>
      </div>
    </blockquote>
    It could certainly be good to have a standard for such metadata
    items for TIFF that apply in the Earth Observation domain, and would
    be the equivalent of netcdf-cf conventions, or maybe porting fields
    from STAC (<a href=3D"https://stacspec.org/" target=3D"_blank">https://=
stacspec.org/</a>). Unfortunately the TIFF tag
    mechanism is hard to make evolve given that it implies a registry to
    attribute a code for a tag/key and an entity that takes care of
    doing that, which no longer happens those past years. Hence my
    suggestion to have that at the GDAL level.=C2=A0 There&#39;s also the
    <a href=3D"https://www.awaresystems.be/imaging/tiff/tifftags/geo_metada=
ta.html" target=3D"_blank">https://www.awaresystems.be/imaging/tiff/tifftag=
s/geo_metadata.html</a>
    tag used by the DGIWG community, to put XML ISO metadata in it, but
    that&#39;s going into complex metadata system.<br></div></blockquote><d=
iv><br></div><div>Alright - what&#39;s the next step in making these GDAL t=
ags more official?</div></div></div>

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