<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Even,<div>Thanks for the pointer to this resource, and for working to support this important functionality. </div><div>Would it make sense to add the -a_coord_epoch option to gdal_edit.py, so users can directly update the GeoTiff header for a dataset with known epoch?</div><div>-David<br id="lineBreakAtBeginningOfMessage"><div>
<meta charset="UTF-8"><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><br><br><br>--</div><div>David Shean<br>Civil and Environmental Engineering<br>University of Washington<br><a href="https://www.ce.washington.edu/facultyfinder/david-shean">https://www.ce.washington.edu/facultyfinder/david-shean </a><br><br>201 More Hall, Box 352700<br>3760 E. Stevens Way NE<br>Seattle, WA 98195-2700<br>Office: (206) 543-3105, Wilcox Hall 265<br>Pronouns: he, him, his</div></div>
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<div><br><blockquote type="cite"><div>On Jan 17, 2024, at 11:40 AM, Even Rouault via gdal-dev <gdal-dev@lists.osgeo.org> wrote:</div><br class="Apple-interchange-newline"><div>
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<div><p>Hi,</p><p>cf test_tiff_write_coordinate_epoch() in
<a class="moz-txt-link-freetext" href="https://github.com/OSGeo/gdal/blob/3a9541d19f2df52f1e66dacfa33878531a5f2c58/autotest/gcore/tiff_write.py#L9575">https://github.com/OSGeo/gdal/blob/3a9541d19f2df52f1e66dacfa33878531a5f2c58/autotest/gcore/tiff_write.py#L9575</a></p><p>On the command line you might use: gdal_translate in.tif out.tif
-a_coord_epoch XXXX.YYY</p><p>Even<br>
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<div class="moz-cite-prefix">Le 17/01/2024 à 20:20, Glen Rice - NOAA
Federal via gdal-dev a écrit :<br>
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<blockquote type="cite" cite="mid:CAGm0ZKdFgWQ3t7ZdHUr2idj5ndvokZ87xgyLZfaj3bW3a6V2sg@mail.gmail.com">
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<div>Hello,</div>
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<div>We are trying to create geotiffs from Python and specify an
epoch for a dynamic CRS. Is there a way to do this
from python or a command line utility?</div>
<div><br>
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<div>We see the pull request adding CoordinateEpochGeoKey (5120)
and expect I could print the information from gdalinfo if I
had an example file. If we were in C/C++ then we could use
libgeotiff and GTIFKeyGet( ). However we are in Python and we
don't see how to write either the CoordinateEpochGeoKey, or
even a generic geokey, into a geotiff.</div>
<div><br>
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<div>For reference we looked at the following links:</div>
<div><a href="https://gdal.org/user/coordinate_epoch.html" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://gdal.org/user/coordinate_epoch.html</a><br>
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<a href="https://github.com/opengeospatial/geotiff/issues/78" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/opengeospatial/geotiff/issues/78</a>
<div><a href="https://github.com/opengeospatial/geotiff/pull/99" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/opengeospatial/geotiff/pull/99</a><br clear="all">
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<div dir="ltr"><a href="https://github.com/OSGeo/libgeotiff/blob/master/libgeotiff/geokeys.inc" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/OSGeo/libgeotiff/blob/master/libgeotiff/geokeys.inc</a><br>
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<div>Thanks for any help,</div>
<div>Glen and Barry</div>
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<span class="gmail_signature_prefix">-- </span><br>
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<div dir="ltr"><font color="#999999">Glen Rice</font></div>
<div><font color="#999999">National Bathymetric
Source</font></div>
<div dir="ltr"><font color="#999999"><span style="font-size:12.8px">Hydrographic
Systems and Technology Branch</span><br>
</font></div>
<div dir="ltr"><font color="#999999">Office of
Coast Survey / Coast Survey Development
Laboratory</font></div>
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