This source has an array on 'feature_id' with 2729077 values, with various fields
elevation, longitude, latitude, qBtmVertRunoff, qBucket, etc '/vsis3/noaa-nwm-retro-v2.0-pds/full_physics/2017/201704010000.CHRTOUT_DOMAIN1.comp' It is accessible via the mdim api. Structurally it is basically a table with rows per feature_id and columns per fields, but it has a length-1 pair of fields "time" and "reference_time" defined on dimension time, this is like a single time step per file (like an unlimited dimension in the classic 2D case). Accessing with the vector API reports that it can't treat this as a table because of those time values that don't match the feature_id dimension: ogrinfo NETCDF:'/vsis3/noaa-nwm-retro-v2.0-pds/full_physics/2017/201704010000.CHRTOUT_DOMAIN1.comp' -ro Warning 1: The dataset has several variables that could be identified as vector fields, but not all share the same primary dimension. Consequently they will be ignored. I've seen similar cases in other files. I presume the driver could be updated to 1) choose the primary dimension and read the values while ignore others 2) user-specify the dimension to include, or 3) user-specify the fields to exclude So: - is there a workaround to enable the vector driver to focus on the primary dimension? - would a PR along those lines have to consider greater difficulties than applying the proposed updates to arrays using the primary dimension only? I'd only consider this for strictly 1D arrays. - degenerate dimensions could be used to copy-out the value of the other dims (I'd consider this an optional extra) (It's a bit special-case-y, you wouldn't want to go to multi-arrays and have them flatten out multi-dims in a general way, I think, but degenerate dimensions might be worth consideration ) Appreciate any thoughts, thanks! I'd quite like to have the vector-approach work as well as the mdim approach, I think they are nicely complementary and provide different pros and cons. Cheers, Mike -- Michael Sumner Software and Database Engineer Australian Antarctic Division Hobart, Australia e-mail: mdsum...@gmail.com
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