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Ticket  Resolution  Summary  Owner  Reporter 

#7  wontfix  Unstructured Grids SuperGrid Requirements  cfwgsupportingtechnologies@…  tomgross 
Description 
The irregular grid specifications have brought up several spatial objects which are not precisely described by a single coordinate location. For instance the edge of a triangle, or the triangle itself. An edge must be described by two points and the triangle by three points. A variable such as heat flux or area are not, necessarily, located at a single point. For convenience we could define spatial locations, center of edge or center of triangle, which could serve as coordinate locations for these variables. As it will still be necessary to describe the edge or triangle, by calling out the locations of the vertices, these derived locations are redundant. These extra locations are very much like the gridspec supergrid points (Balaji 2006). They might be useful enough to become a requirement of the CF conventions.


#93  fixed  Two new dimensionless vertical coordinate specifications for s coordinate ocean models  cfconventions@…  rsignell 
Description 
1. TitleTwo new dimensionless vertical coordinates to support ocean models 2. ModeratorRich Signell 3. RequirementThe ocean modeling community needs two additional vertical coordinate specifications to allow modern scoordinate model output to be CFcompliant and allow more general specification of scoordinate model output for future development. 4. Initial Statement of Technical ProposalThe existing ocean_s_coordinate dimensionless vertical coordinate specification in CF is limited to a specific vertical stretching function and set of control parameters, while modern versions of ROMS allow for more flexible specification. Additional of these two new generalized vertical coordinate specifications would allow output from existing ROMSderived models (and other s coordinate models) to be CFcompliant, as well as allowing more flexibility for future s_coordinate model developers and users to write and read CFcompliant model output. Here are the proposed additions to Appendix D. Dimensionless Vertical Coordinates Ocean scoordinate, generic form 1 standard_name = "ocean_s_coordinate_g1"
and where z(n,k,j,i) is the height, positive upwards, relative to ocean datum (e.g. mean sea level) at gridpoint (n,k,j,i); eta(n,j,i) is the height of the ocean surface, positive upwards, relative to ocean datum at gridpoint (n,j,i); s(k) is the dimensionless coordinate at vertical gridpoint (k) with a range of 1 <= s(k) <= 0, s(0) corresponds to eta(n,j,i) whereas s(1) corresponds to depth(j,i); C(k) is the dimensionless vertical coordinate stretching function at gridpoint (k) with a range of 1 <= C(k) <= 0, C(0) corresponds to eta(n,j,i) whereas C(1) corresponds to depth(j,i); and the constant depth_c, (positive value), is a critical depth controlling the stretching. The format for the formula_terms attribute is formula_terms = "s: var1 C: var2 eta: var3 depth: var4 depth_c: var5" Ocean scoordinate, generic form 2 standard_name = "ocean_s_coordinate_g2"
and where z(n,k,j,i) is the height, positive upwards, relative to ocean datum (e.g. mean sea level) at gridpoint (n,k,j,i); eta(n,j,i) is the height of the ocean surface, positive upwards, relative to ocean datum at gridpoint (n,j,i); s(k) is the dimensionless coordinate at vertical gridpoint (k) with a range of 1 <= s(k) <= 0, s(0) corresponds to eta(n,j,i) whereas s(1) corresponds to depth(j,i); C(k) is the dimensionless vertical coordinate stretching function at gridpoint (k) with a range of 1 <= C(k) <= 0, C(0) corresponds to eta(n,j,i) whereas C(1) correspond to depth(j,i); and the constant depth_c, (positive value) is a critical depth controlling the stretching. The format for the formula_terms attribute is formula_terms = "s: var1 C: var2 eta: var3 depth: var4 depth_c: var5" 5. Benefits
6. Status Quo


#88  fixed  Terms of Reference for the CF Data Model  davidhassell  markh 
Description 
ObjectiveThe purpose of this ticket is to agree the scope and terms of reference for the CF data model. ProposalScope, Terms and Conditions
BenefitsThe data model is believed to offer the following benefits providing:
