[CF-metadata] 2D latitude, longitude coordinates detection

From: John Caron <caron>
Date: Thu, 03 Jul 2003 13:22:43 -0600

below is the ncdump of a file. the CF convention checker passes it with
"0 errors". my parser doesnt find the 2D latitude, longitude coordainte
variables, because i assumed that they have to be named by a
"coordinate" attribute (section 5.2). Opinions?

netcdf C:\data\conventions\cf\signell_july2_03.nc {
 dimensions:
   s_rho = 20; // (has coord.var)
   latitude = 60;
   longitude = 160;
   time = UNLIMITED; // (2 currently) // (has coord.var)

 variables:
   double Cs_r(s_rho);
    :long_name = "S-coordinate stretching curves at RHO-points";
    :valid_min = -1.0; // double
    :valid_max = 0.0; // double
   double theta_s;
    :long_name = "S-coordinate surface control parameter";
   double theta_b;
    :long_name = "S-coordinate bottom control parameter";
   double h(latitude, longitude);
    :long_name = "bathymetry at RHO-points";
    :units = "meter";
   double hc;
    :long_name = "S-coordinate parameter, critical depth";
    :units = "meter";
   double latitude(latitude, longitude);
    :long_name = "latitude of RHO-points";
    :units = "degrees_north";
   double longitude(latitude, longitude);
    :long_name = "longitude of RHO-points";
    :units = "degrees_east";
   double s_rho(s_rho);
    :long_name = "S-coordinate at RHO-points";
    :valid_min = -1.0; // double
    :valid_max = 0.0; // double
    :standard_name = "ocean_s_coordinate";
    :positive = "up";
    :formula_terms = "s: s_rho eta: zeta depth: h a: theta_s b: theta_b
depth_c: hc";
   float temp(time, s_rho, latitude, longitude);
    :long_name = "potential temperature";
    :units = "Celsius";
   double time(time);
    :long_name = "time since initialization";
    :units = "seconds since 1968-05-23 00:00:00 UTC";
    :calendar = "gregorian";
   float zeta(time, latitude, longitude);
    :long_name = "free-surface";
    :units = "meter";

 // Global Attributes:
    :Conventions = "CF-1.0";
    :type = "ROMS/TOMS output averages file";

}



File name: C:\data\conventions\cf\signell_july2_03.nc


--------------------------------------------------------------------------------
Output of CF-Checker follows...

CHECKING NetCDF FILE
=====================

------------------
Checking variable: theta_b
------------------

------------------
Checking variable: Cs_r
------------------

------------------
Checking variable: temp
------------------

------------------
Checking variable: h
------------------

------------------
Checking variable: longitude
------------------

------------------
Checking variable: s_rho
------------------

------------------
Checking variable: theta_s
------------------

------------------
Checking variable: time
------------------

------------------
Checking variable: latitude
------------------

------------------
Checking variable: hc
------------------

------------------
Checking variable: zeta
------------------

ERRORS detected: 0
WARNINGS given: 0
Received on Thu Jul 03 2003 - 13:22:43 BST