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 id 6811628e-16ee7c2284077844; Fri, 13 May 2022 00:30:00 +0200
Received-SPF: None (mx101.skynet.be: no sender authenticity
  information available from domain of
  tiff-bounces@lists.osgeo.org) identity=pra;
  client-ip=140.211.15.3; receiver=mx101.skynet.be;
  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 (mx101.skynet.be: domain of
  SRS0=Mdwf=VU=lists.osgeo.org=tiff-bounces@osgeo.org
  designates 140.211.15.3 as permitted sender)
  identity=mailfrom; client-ip=140.211.15.3;
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  envelope-from="SRS0=Mdwf=VU=lists.osgeo.org=tiff-bounces@osgeo.org";
  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
  a:secure.osgeo.osuosl.org ip4:140.211.15.57
  ip4:140.211.15.32 ip4:140.211.15.26 ip4:140.211.15.6"
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  client-ip=140.211.15.3; receiver=mx101.skynet.be;
  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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Date: Thu, 12 May 2022 18:29:34 -0400
Message-ID: <CACp925Tea0YzcZ=sbfvtKKZejywLpsxwUBuPbKUvgPwhJBO-Mg@mail.gmail.com>
To: Even Rouault <even.rouault@spatialys.com>
Subject: Re: [Tiff] best tiff tag names for start and end datetimes?
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From: Kemp Watson via Tiff <tiff@lists.osgeo.org>
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This is a bit of an offhand comment without much thought, but perhaps TIFF
group should focus only on describing the physical manifestation of the
pixels, and the more "usage" oriented metadata is best left to other
entities?
That's a pretty rough comment, and I know there's a fair bit of history
that contradicts that line of thought, but just putting it out there as a
possible future guideline.

Kemp

On Thu, May 12, 2022 at 6:16 PM Even Rouault <even.rouault@spatialys.com>
wrote:

>
> Le 12/05/2022 =C3=A0 23:58, Simon (Vsevolod) Ilyushchenko a =C3=A9crit :
>
>
>
> 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 =3D cloud-optimize=
d
>> geotiffs <https://www.cogeo.org/>) are the lingua franca of our
>> community.  Setting GDAL fields START_DATE and END_DATE indeed feels lik=
e a
>> good solution, so I wanted to find out how to do this properly in the ho=
pe
>> of creating a standard.
>>
>> It could certainly be good to have a standard for such metadata items fo=
r
>> 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?
>
> That would probably be more a discussion for the gdal-dev mailing list, o=
r
> perhaps even the broader COG community.
>
> -- http://www.spatialys.com
> My software is free, but my time generally not.
>
> _______________________________________________
> Tiff mailing list
> Tiff@lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/tiff
>

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<div dir=3D"ltr">This is a bit of an offhand comment without much thought, =
but perhaps TIFF group should focus only on describing the physical manifes=
tation of the pixels, and the more &quot;usage&quot; oriented metadata is b=
est left to other entities?<div>That&#39;s a pretty rough comment, and I kn=
ow there&#39;s a fair bit of history that contradicts that line of thought,=
 but just putting it out there as a possible future guideline.</div><div><b=
r></div><div>Kemp</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr">On Thu, May 12, 2022 at 6:16 PM Even Rouault &lt;<a =
href=3D"mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
 =20
   =20
 =20
  <div>
    <p><br>
    </p>
    <div>Le 12/05/2022 =C3=A0 23:58, Simon (Vsevolod)
      Ilyushchenko a =C3=A9crit=C2=A0:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <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 2:5=
0
            PM Even Rouault &lt;<a href=3D"mailto:even.rouault@spatialys.co=
m" target=3D"_blank">even.rouault@spatialys.com</a>&gt;
            wrote:<br>
          </div>
          <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
            <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"_=
blank">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/tifft=
ags/geo_metadata.html" target=3D"_blank">https://www.awaresystems.be/imagin=
g/tiff/tifftags/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>
          <div><br>
          </div>
          <div>Alright - what&#39;s the next step in making these GDAL tags
            more official?</div>
        </div>
      </div>
    </blockquote>
    That would probably be more a discussion for the gdal-dev mailing
    list, or perhaps even the broader COG community.<br>
    <pre cols=3D"72">--=20
<a href=3D"http://www.spatialys.com" target=3D"_blank">http://www.spatialys=
.com</a>
My software is free, but my time generally not.</pre>
  </div>

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</blockquote></div>

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