UFO
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Bayesian cost function for detecting cloud-affected radiances. More...
#include <CloudCostFunction.h>
Public Member Functions | |
CloudCostFunction (const eckit::LocalConfiguration &=eckit::LocalConfiguration()) | |
void | compute (const ObsFilterData &, ioda::ObsDataVector< float > &) const |
compute the result of the function More... | |
const ufo::Variables & | requiredVariables () const |
geovals required to compute the function More... | |
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ObsFunctionBase (const eckit::LocalConfiguration conf=eckit::LocalConfiguration()) | |
virtual | ~ObsFunctionBase () |
Private Attributes | |
ufo::Variables | invars_ |
std::vector< int > | channels_ |
std::vector< std::string > | fields_ |
CloudCostFunctionParameters | options_ |
Additional Inherited Members | |
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typedef float | Value_ |
Type of the values produced by the function. More... | |
Bayesian cost function for detecting cloud-affected radiances.
The cloud cost, Jc, is calculated from observation-H(x) departures, y, via
Jc = (0.5/Nchan) * y.W.y^T
where Nchan is the number of channels in the calculation and W is the inverse of (H.B.H^T + R):
H is the Jacobian matrix; B is a background error covariance matrix; R is an observation error covariance matrix.
The heritage of this code is the Met Office routine Ops_SatRad_CloudCost.
Implementation here follows Met Office usage, with a static (latitude-varying) B-matrix and a fixed, diagonal R-matrix.
Reference: S.J. English, J.R. Eyre and J.A. Smith. A cloud‐detection scheme for use with satellite sounding radiances in the context of data assimilation for numerical weather prediction support of nowcasting applications. Quart. J. Royal Meterol. Soc., Vol. 125, pp. 2359-2378 (1999). https://doi.org/10.1002/qj.49712555902
Definition at line 112 of file CloudCostFunction.h.
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explicit |
Definition at line 23 of file CloudCostFunction.cc.
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virtual |
compute the result of the function
Implements ufo::ObsFunctionBase< float >.
Definition at line 56 of file CloudCostFunction.cc.
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virtual |
geovals required to compute the function
Implements ufo::ObsFunctionBase< float >.
Definition at line 258 of file CloudCostFunction.cc.
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private |
Definition at line 122 of file CloudCostFunction.h.
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private |
Definition at line 123 of file CloudCostFunction.h.
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private |
Definition at line 121 of file CloudCostFunction.h.
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private |
Definition at line 124 of file CloudCostFunction.h.