Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

There is a python package that can perform a more detailed analysis of mapping files (see  Map file analysis).   It can compute the following additional checks:  

  • Row sums:  For atmosphere target gridso2a maps, separates row sums into those over atm cells that are 100% land or 100%  ocean (all row sums should be 1), and partial land/ ocean cells (row sums should range from 0 to 1) 
  • Column sums: For atm2ocn a2o grids: separate column sums into those over atm cells that are 100% ocean ( should be 1 for conservative maps) and partial ocean cells (row sums should range from 0 to 1 for conservative maps)
  • For atmosphere target grids, check if the map is consistent with the atmosphere land fraction mask defined by the flux map (i.e. the map must produce land or ocean data for atm cells that have land or ocean fractions>0)  
  • Measure mapping error using a standard test function, plotting the results and computing L2 and max errors.  For atmosphere target grids, separates errors into those over atm cells that are 100% land or ocean, and partial land/ocean cells (which can have much larger errors).     These errors can be compared to know working configurations to determine if they are sufficiently small. 

...