Custom Query (124 matches)
Results (16  18 of 124)
Ticket  Resolution  Summary  Owner  Reporter 

#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


#19  fixed  Standard Name Modifiers  ros  ros 
Description 
Allow standard_name attribute to be comprised of a standard name optionally followed by one or more blanks and a standard name modifier (a string value from Appendix C, Standard Name Modifiers). 

#20  fixed  Incorrect parsing of flag_values attribute  ros  ros 
Description 
Section 3.5 of the conventions document states that "The flag_values attribute is the same type as the variable to which it is attached, and contains a list of the possible flag values." E.g. current_speed_qc:flag_values = 0b, 1b, 2b ; But Appendix A specified the flag_values type as string. This is what the checker based the check on which is incorrect. The conventions document has been corrected. The CF checker needs to implement this change too. 