What is the format of the regional mask ancillary files, and what values do they contain?
The ancillary files “anc27_001_0001.dat” and “anc27_001_0000.dat” are FORTRAN direct-access files. The file “anc27_001_0001.dat” has a 1440-byte header record that lists individual regions the mask files used to create the final grid, along with other housekeeping information. The header is in ASCII format, which you can view with the Unix “head” command. Data consist of one 4-byte record for each 1° latitude/longitude cell. The value in the record is a 4-byte integer. If the surface type is constant throughout the cell, the record contains the negative of the surface type (see Surface Type Coding below). If the surface type is not constant throughout the coarse cell, the record contains the starting location in the fine grid file of the subgrid with the surface types for this coarse cell. The location is given as the byte offset from the beginning of the fine grid file. Records start at the North Pole, with 0° – 360° longitude, before stepping to the next latitude band where the seque
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