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<p>Michael,</p>
<p>my understanding of
<a class="moz-txt-link-freetext" href="https://geoarrow.org/format.html#memory-layouts">https://geoarrow.org/format.html#memory-layouts</a> is that what
writes OGR is supposed to be fine since they mentionned types like
'<code>List<List<FixedSizeList<double>[2]>>'</code>.
Perhaps I've missed something or nanoarrow has stricter
expectations? CC'ing Dewey Dunnington<br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 07/10/2024 à 15:23, Michael Sumner
via gdal-dev a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAAcGz98S5Jw24ZYKWNhXuA9dgL1RWVd6oJ7oLrkq9mR4gfGsXQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">I realize I left out the INTERLEAVING, ie.
<div><br>
</div>
<div>ogr2ogr ~/fromgdal.arrow
ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc
-lco GEOMETRY_ENCODING=GEOARROW_INTERLEAVED<br>
</div>
<div><br>
</div>
<div>but still, I get these list<item elements rather than
their rings/vertices/geoarrow.point type names: </div>
<div><br>
</div>
<div><nanoarrow_array_stream struct<row_num: int32,
geometry: geoarrow.polygon{list<item: list<item:
fixed_size_list(2)<xy: double>>>}>><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Oct 8, 2024 at
12:19 AM Michael Sumner <<a
href="mailto:mdsumner@gmail.com" moz-do-not-send="true"
class="moz-txt-link-freetext">mdsumner@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">When I investigate the schema in one of the
test files
<div><br>
</div>
<div>ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc<br>
</div>
<div><br>
</div>
<div>I see expected list<polygons and list<rings and
xy etc. I'm printing this by using R
nanoarrow::read_arrow, or from poLayer->GetArrowStream
and I get the same output: </div>
<div><br>
</div>
<div><nanoarrow_array_stream struct<row_num: int32,
geometry: geoarrow.polygon{list<rings:
list<vertices: geoarrow.point{fixed_size_list(2)<xy:
double>}>>}>><br>
<div><br>
</div>
<div>If I write a new .arrow with GDAL </div>
<div><br>
</div>
<div>ogr2ogr ~/fromgdal.arrow
ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc<br>
</div>
<div><br>
</div>
<div>the stream schema looks like this: </div>
<div><br>
</div>
<div><nanoarrow_array_stream struct<row_num: int32,
geometry: geoarrow.polygon{list<item: list<item:
struct<x: double, y: double>>>}>><br>
</div>
<div><br>
</div>
<div>and from nanoarrow I see</div>
<div><br>
</div>
<div>nanoarrow::read_nanoarrow("~/fromgdal.arrow")<br>
Error in read_nanoarrow.character("~/fromgdal.arrow") :<br>
array_stream->get_schema(): [29] Expected >=
1330795077 bytes of remaining data but found 2266 bytes
in buffer<br>
</div>
<div><br>
</div>
<div>Are we in-between moves regarding specifications, or
something? I'm having good results generally and this
seems like a problem in the Arrow driver for write. </div>
<div><br>
</div>
<div>Cheers, Mike</div>
<div><br>
</div>
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">Michael Sumner<br>
Research Software Engineer<br>
Australian Antarctic Division<br>
Hobart, Australia<br>
e-mail: <a href="mailto:mdsumner@gmail.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">mdsumner@gmail.com</a></div>
</div>
</div>
</div>
</blockquote>
</div>
<br clear="all">
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">Michael Sumner<br>
Research Software Engineer<br>
Australian Antarctic Division<br>
Hobart, Australia<br>
e-mail: <a href="mailto:mdsumner@gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">mdsumner@gmail.com</a></div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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</blockquote>
<pre class="moz-signature" cols="72">--
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My software is free, but my time generally not.</pre>
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