Michael,
my understanding of https://geoarrow.org/format.html#memory-layouts is
that what writes OGR is supposed to be fine since they mentionned types
like '|List<List<FixedSizeList<double>[2]>>'|. Perhaps I've missed
something or nanoarrow has stricter expectations? CC'ing Dewey Dunnington
Even
Le 07/10/2024 à 15:23, Michael Sumner via gdal-dev a écrit :
I realize I left out the INTERLEAVING, ie.
ogr2ogr ~/fromgdal.arrow
ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc -lco
GEOMETRY_ENCODING=GEOARROW_INTERLEAVED
but still, I get these list<item elements rather than their
rings/vertices/geoarrow.point type names:
<nanoarrow_array_stream struct<row_num: int32, geometry:
geoarrow.polygon{list<item: list<item: fixed_size_list(2)<xy: double>>>}>>
On Tue, Oct 8, 2024 at 12:19 AM Michael Sumner <mdsum...@gmail.com> wrote:
When I investigate the schema in one of the test files
ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc
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:
<nanoarrow_array_stream struct<row_num: int32, geometry:
geoarrow.polygon{list<rings: list<vertices:
geoarrow.point{fixed_size_list(2)<xy: double>}>>}>>
If I write a new .arrow with GDAL
ogr2ogr ~/fromgdal.arrow
ogr/data/arrow/from_paleolimbot_geoarrow/polygon-default.ipc
the stream schema looks like this:
<nanoarrow_array_stream struct<row_num: int32, geometry:
geoarrow.polygon{list<item: list<item: struct<x: double, y:
double>>>}>>
and from nanoarrow I see
nanoarrow::read_nanoarrow("~/fromgdal.arrow")
Error in read_nanoarrow.character("~/fromgdal.arrow") :
array_stream->get_schema(): [29] Expected >= 1330795077 bytes of
remaining data but found 2266 bytes in buffer
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.
Cheers, Mike
--
Michael Sumner
Research Software Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsum...@gmail.com
--
Michael Sumner
Research Software Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsum...@gmail.com
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