Notes on OpenPMD https://www.openpmd.org/#/start

OpenPMD2D.ipynb

OpenPMDNotes.md

OpenPMD notes

Fields, spatial quantities are records.

Position.x - a component of a record.

Each record has attributes:

• unitSI (conversion factor)
• unitDimension (dimensionality)
  • Powers of SI - https://www.openpmd.org/#/step-12
    • easy to transform that into units!
• time/timeUnitSI

Squashing constant data

Provide a common interface (.value, .unitSI, .shape) for arrays and constants via treating the latter like hdf5 groups.

Charge-as-an-array:

• particles (group)
  • electrons (group):
    • charge (array)
      • unitSI (attribut)

Charge-an-a-group:

• particles (group)
  • electrons (group):
    • charge (group)
      • value (attribute, float)
      • unitSI (attribute)
      • shape (attribute)

For Cartesian 2D (z=const) you can have z-as-a-group.

Existing tools:

• openPMD Viewer
  • has Python API apparently
• Has a API at https://github.com/openPMD/openPMD-api

neat Zenodo poster

https://zenodo.org/record/822396

Also:

• this twitter thread https://twitter.com/StanczakDominik/status/1007310404886978563?s=19