PetscDALETKFLocalizationType

Type of localization kernel used by PETSCDALETKF

Synopsis

typedef enum {
  PETSCDA_LETKF_LOC_NONE         = 0,
  PETSCDA_LETKF_LOC_GASPARI_COHN = 1,
  PETSCDA_LETKF_LOC_GAUSSIAN     = 2,
  PETSCDA_LETKF_LOC_BOXCAR       = 3,
  PETSCDA_LETKF_LOC_NUM_TYPES
} PetscDALETKFLocalizationType;

Values

• PETSCDA_LETKF_LOC_NONE - No localization. Each vertex sees every observation with weight one; the per-vertex loop reduces to a single global analysis (the classic ETKF).

• PETSCDA_LETKF_LOC_GASPARI_COHN - Gaspari-Cohn fifth-order piecewise rational kernel with compact support at twice the radius

• PETSCDA_LETKF_LOC_GAUSSIAN - Gaussian kernel exp(-d^2 / (2 r^2)) truncated at twice the radius

• PETSCDA_LETKF_LOC_BOXCAR - Uniform weight one inside the radius, zero outside

Options Database Keys

• -petscda_letkf_localization_type (none|gaspari_cohn|gaussian|boxcar) - select the localization kernel at run time

See Also

PetscDA: Data Assimilation, PETSCDALETKF, PetscDALETKFSetLocalizationType(), PetscDALETKFGetLocalizationType(), PetscDALETKFSetLocalizationRadius(), PetscDALETKFSetLocalizationCoordinates()

Level

intermediate

Location

include/petscda.h

Examples

src/ml/da/tutorials/ex4.c
src/ml/da/tutorials/ex2.c

Examples

src/ml/da/tutorials/ex1.c
src/ml/da/tutorials/ex4.c
src/ml/da/tutorials/ex2.c

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Index of all PetscDA routines
Table of Contents for all manual pages
Index of all manual pages