Initialization and bootstrapping

There are three ways to start PISM:

• option -i reads a previously-saved “complete” PISM model state from a NetCDF file, or

• option -i -bootstrap reads an “incomplete” NetCDF file and uses heuristics to fill in needed fields, or

• pismr -eisII ... and the pismv executable are used to initialize simplified-geometry experiments and verification tests from formulas in the source code, and thus no input file is required.

One of the first two choices is required when using the executable pismr. Modeling usually starts with the -i input.nc -bootstrap because real ice sheet observations are never complete initial conditions. Runs with multiple stages often use the -i option after the first stage.

• Initialization from a saved model state
  • -i file format
• Bootstrapping
  • -bootstrap file format

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