Hello Iain, Unfortunately I am also very new at netcdf :) But it would be great if we could work together on this.
It sounds like we are definitely going to need this feature... For us it is to have a 2D time coordinate that includes a runtime dimension. I am going to do more investigations on the implications for the code in the geotools plugin and get back to you. Regards Niels On 12-10-16 12:30, Iain Matcham wrote: > Hi Niels, > > I would be happy to work on this together with you. Sounds like we > have a similar situation of "would like it but can't justify the work > right now" :) I will talk to my boss tomorrow and see if I can use > some time to progress this in the near future. > > It's been a while since I looked at this, but from memory: > > The axes' data are being read fine by netcdf-java, but when the > geotools reader parses the file looking for quantities that are > eligible for axes, it does not consider anything that is not > one-dimensional, thus discarding the true axes in the two-dimensional > axis files. > > The solution that I had mapped out in my head (that's as far as it > got) would be to capture the eligible zero dimensional quantities > (rlat,rlon), check for matching two dimensional quantities and if they > exist, make them eligible as axes as well. It would require some > reworking or extension of the axis definitions as they have a bunch of > code checking for regularity which would have to be completely > reimagined for two-dim files. > > I only really got as far as the investigation and conceptual stage, so > there may of course be other complications that I haven't discovered > yet. Also I'm not a netcdf expert ( my first main investigation of > the format was this exercise), so you may be able to improve on this! > > Kind regards > > Iain > > > On 12/10/2016 11:13 p.m., Niels Charlier wrote: >> Hello Iain, >> >> Thank you for your response. >> It looks like I might need to work on this as well. Perhaps we can >> work on it together. But we are still investigating whether we really >> need it or not, so I will let you know. >> I would like to know what you found out in your investigation stage >> about the problem. I would expect that changes need to be made to >> netcdf-java to support it as well? >> >> Kind Regards >> Niels >> >> On 05-10-16 11:55, Iain Matcham wrote: >>> Hi Niels, >>> >>> I did start the work, but then it got down-prioritised at my end, so I >>> never got much part the preliminary investigation stage. >>> >>> As there had been no indication of any interest from my original email >>> to the list, once my management decided other things were more >>> important >>> I didn't push to keep going on this. But if this is a feature that you >>> or others think is worthwhile I am more than happy push my >>> management to >>> be allowed to continue my work on this. >>> >>> Thanks >>> Iain >>> >>> On 5/10/2016 10:18 p.m., Niels Charlier wrote: >>>> Hello Iain, >>>> >>>> Did you ever carry out your plans to support two dimension coordinate >>>> variables? >>>> >>>> Kind Regards >>>> >>>> Niels >>>> >>>> >>>> On 06/20/2016 04:55 AM, Iain Matcham wrote: >>>>> Hi >>>>> >>>>> I have a number of netcdf files that I am trying to read with >>>>> gt-netcdf. However they use two dimensional coordinate variables as >>>>> described here: >>>>> http://cfconventions.org/cf-conventions/cf-conventions.html#_two_dimensional_latitude_longitude_coordinate_variables >>>>> >>>>> >>>>> >>>>> I understand that gt-netcdf does not currently support these and am >>>>> happy to look into extending it to do so, but wanted to check >>>>> beforehand >>>>> if this is a good idea or if there are any political or other factors >>>>> that I might want to consider before diving into this. >>>>> >>>>> Thanks >>>>> Iain >>>>> >>>> ------------------------------------------------------------------------------ >>>> >>>> >>>> Check out the vibrant tech community on one of the world's most >>>> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >>>> _______________________________________________ >>>> GeoTools-Devel mailing list >>>> GeoTools-Devel@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/geotools-devel >> >> > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ GeoTools-Devel mailing list GeoTools-Devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
