4 Transformation auxiliary data files

The mapping files to be used for the MAPPING option must be consistent with the files generated by the SCRIP library to be used for the SCRIPR transformations (see also section 4.3). The files are NetCDF containing the following fields:

dimensions:
      src_grid_size = xxx ;
      dst_grid_size = xxx ;
      num_links = xxx ;
      num_wgts = xxx ;
variables:
      int src_address(num_links) 
      int dst_address(num_links) 
      double remap_matrix(num_links, num_wgts)

where

• src_grid_size is a scalar integer indicating the total number of points in the source grid. This field is a netCDF dimension.
• dst_grid_size is a scalar integer indicating the total number of points in the target grid. This field is a netCDF dimension.
• num_links is a scalar integer indicating the total number of associated source and target grid point pairs in the file. This field is a netCDF dimension.
• num_wgts is a scalar integer indicating the number of weights per associated grid point pair (up to 5 are supported, see sections 2.2.7 and 4.3 for BICUBIC and CONSERV/SECOND). This field is a netCDF dimension.
• src_address is a one dimensional array of size num_links. It contains the integer source address associated with each weight. This field is a netCDF variable.
• dst_address is a one dimensional array of size num_links. It contains the integer destination address associated with each weight. This field is a netCDF variable.
• remap_matrix is a two dimensional array of size (num_links, num_wgts). It contains the real weight value(s) associated with the source and destination address. For each link, up to 5 weights are supported, see sections 2.2.7 and 4.3 especially for BICUBIC and CONSERV/SECOND. This field is a netCDF variable.