Re: [CF-metadata] grid cells with a varying number of cell bounds

On Tue, Jan 2, 2018 at 12:24 PM, V Balaji - NOAA Affiliate < v.bal...@noaa.gov> wrote: > I would not recommend UGRID for non-standard but structured (e.g logically > rectangular) grids. nor would I. > I'm not aware of anyone planning to turn in data on a completely > unstructured grid in

Re: [CF-metadata] grid cells with a varying number of cell bounds

On Tue, Jan 2, 2018 at 12:52 PM, Charlie Zender wrote: > > By the way, the UGRID standard maps pretty well to how unstructured grid > > models generally store their grids and read and write them anyway, so it > > shouldn't be a heavy lift to support it. > > Chris, I think you

Re: [CF-metadata] grid cells with a varying number of cell bounds

> By the way, the UGRID standard maps pretty well to how unstructured grid > models generally store their grids and read and write them anyway, so it > shouldn't be a heavy lift to support it. Chris, I think you underestimate the work required. Many models on unstructured grids (e.g., CAM-SE,

Re: [CF-metadata] grid cells with a varying number of cell bounds

I would not recommend UGRID for non-standard but structured (e.g logically rectangular) grids. I'm not aware of anyone planning to turn in data on a completely unstructured grid in CMIP6. Thanks, and best wishes to everyone for 2018, Karl Taylor writes: In CMIP we require that  both

Re: [CF-metadata] grid cells with a varying number of cell bounds

On Tue, Jan 2, 2018 at 11:03 AM, Karl Taylor wrote: > In CMIP we require that both missing_value and _FillValue be defined as > 1.e20 for requested variables that occupy only a portion of the global > grid. For bounds variables, I'll suggest that when needed, both _FillValue

Re: [CF-metadata] grid cells with a varying number of cell bounds

In CMIP we require that  both missing_value and _FillValue be defined as 1.e20 for requested variables that occupy only a portion of the global grid.  For bounds variables, I'll suggest that when needed, both _FillValue and missing_value also be defined as 1.e20. That way software that relies

Re: [CF-metadata] grid cells with a varying number of cell bounds

On Wed, Dec 20, 2017 at 2:21 PM, Karl Taylor wrote: > > My sense is that no one violently opposes the use of missing_value to fill > unused vertices for grid cells with fewer than the maximum number of > vertices. > I'm pretty sure this has been brought this up before (at

Re: [CF-metadata] grid cells with a varying number of cell bounds

: *"cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> *Cc: *Karl Taylor <taylo...@llnl.gov> *Subject: *Re: [CF-metadata] grid cells with a varying number of cell bounds I prefer _FillValue to missing_value. On 12/20/17 14:22, cf-metadata-requ...@cgd.ucar.edu <mailto:c

[CF-metadata] grid cells with a varying number of cell bounds

20 Dec 2017 14:21:53 -0800 > User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) > Gecko/20100101 Thunderbird/52.5.0 > Subject: Re: [CF-metadata] grid cells with a varying number of cell bounds > > Hi all, > > It now becomes urgent to resolve this discussi

Re: [CF-metadata] grid cells with a varying number of cell bounds

reading.ac.uk> *Cc:* CF Metadata <cf-metadata@cgd.ucar.edu> *Subject:* Re: [CF-metadata] grid cells with a varying number of cell bounds Hello, Coorecting an error in my last post: On 8 September 2017 at 17:51, David Hassell <david.hass...@ncas.ac.uk <mailto:david.hass..

Re: [CF-metadata] grid cells with a varying number of cell bounds

edu> on behalf of Charlie Zender <zen...@uci.edu> Organization: University of California, Irvine Date: Wednesday, December 20, 2017 at 2:35 PM To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> Cc: Karl Taylor <taylo...@llnl.gov> Subject: Re: [CF-metadata] grid cells wi

Re: [CF-metadata] grid cells with a varying number of cell bounds

I prefer _FillValue to missing_value. On 12/20/17 14:22, cf-metadata-requ...@cgd.ucar.edu wrote: > My sense is that no one violently opposes the use of missing_value to > fill unused vertices for grid cells with fewer than the maximum number > of vertices. -- Charlie Zender, Earth System Sci. &

Re: [CF-metadata] grid cells with a varying number of cell bounds

t; *Cc:* CF Metadata <cf-metadata@cgd.ucar.edu> *Subject:* Re: [CF-metadata] grid cells with a varying number of cell bounds Hello, Coorecting an error in my last post: On 8 September 2017 at 17:51, David Hassell <david.hass...@ncas.ac.uk <mailto:david.hass...@ncas.ac.uk>>

Re: [CF-metadata] grid cells with a varying number of cell bounds

AM To: Jonathan Gregory <j.m.greg...@reading.ac.uk> Cc: CF Metadata <cf-metadata@cgd.ucar.edu> Subject: Re: [CF-metadata] grid cells with a varying number of cell bounds Hello, Coorecting an error in my last post: On 8 September 2017 at 17:51, David Hassell <david.has

Re: [CF-metadata] grid cells with a varying number of cell bounds

for that case, rather than >> the >> simple geometries convention. >> >> Best wishes >> >> Jonathan >> >> - Forwarded message from Karl Taylor <taylo...@llnl.gov> - >> >> > Date: Fri, 8 Sep 2017 07:12:06 -0700 >> >

Re: [CF-metadata] grid cells with a varying number of cell bounds

On Fri, Sep 8, 2017 at 10:22 AM, V Balaji - NOAA Affiliate < v.bal...@noaa.gov> wrote: > The relevant section of the UGRID conventions > > seems > consistent with this (except

Re: [CF-metadata] grid cells with a varying number of cell bounds

The relevant section of the UGRID conventions seems consistent with this (except _FillValue is suggested). It goes on to say "...we may use in the future a ragged array, but here

Re: [CF-metadata] grid cells with a varying number of cell bounds

Fri, 8 Sep 2017 07:12:06 -0700 > > From: Karl Taylor <taylo...@llnl.gov> > > To: cf-metadata@cgd.ucar.edu > > Subject: Re: [CF-metadata] grid cells with a varying number of cell > bounds > > User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) >

[CF-metadata] grid cells with a varying number of cell bounds

> To: cf-metadata@cgd.ucar.edu > Subject: Re: [CF-metadata] grid cells with a varying number of cell bounds > User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) > Gecko/20100101 Thunderbird/52.2.1 > > Dear Jonathan and all, > > Regarding the options f

Re: [CF-metadata] grid cells with a varying number of cell bounds

Karl, I agree with you. I don't see a problem with the existing convention being tweaked to state that fewer vertices for a cell are indicated by missing values in the last elements. Jim [image: CICS-NC] Visit us on Facebook *Jim Biard*

Re: [CF-metadata] grid cells with a varying number of cell bounds

Dear Jonathan and all, Regarding the options for representing polygon cells with varying number of sides (see below), I agree that the "simple geometries" proposal can indeed handle this case. ( It of course could also handle the case when all grid cells have the same number of sides.) I

Re: [CF-metadata] grid cells with a varying number of cell bounds

Dear Karl > I certainly always envisaged the possibility of cells of different > shapes, and we imply that this might be the case in the description > of cell bounds with the explicit mention of "maximum": > > /"A boundary variable will have one more dimension than its > associated coordinate or

[CF-metadata] grid cells with a varying number of cell bounds

HI all, Consider a grid consisting of both triangular and rectangular grid cells with n total grid cells. In this case the cell_bounds for longitude could be dimensioned (n, 4) because there are a maximum of 4 cell vertices. My question is, for the triangular grid cells do we *require* the