[gdal-dev] Motion: adopt RFC 81: support for coordinate epochs in geospatial formats

jratike80 jukka.rahkonen at maanmittauslaitos.fi
Fri May 14 03:11:13 PDT 2021


For me the RFC feels good. Existing data formats like GeoTIFF and GeoJSON
can deliver the 4D spatiotemporal coordinates correctly by using the epoch
attached as metadata when the whole dataset  is using the same epoch. None
of the formats dealt in the RFC should get broken. If some software does not
know what to do with the metadata it will discard the metadata and the
situation is the same than now. Those who use dynamic coordinate systems
probably know that without epoch the data are undefined and then they will
try to find the epoch by some other means.

Personally I like that data and metadata are kept in the same file. But if
it feels bad, could it be an option to use a sidecar file ".aux.xml" for the
single file / single layer formats like GeoJSON?

Obviously there is lot to do with dynamic reference systems
https://geophysica.fi/pdf/geophysica_2019_54_kierulf.pdf but this RFC could
be a good start.

-Jukka Rahkonen-

Even Rouault-2 wrote
> Hi,
> Motion:
> adopt RFC 81: support for coordinate epochs in geospatial formats ( 
> https://github.com/OSGeo/gdal/pull/3827 )
> Starting with my +1
> Even
> -- 
> http://www.spatialys.com
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