ObsFunctions in UFO¶

Observation Functions are more advanced filtering routines that are encapsulated together in a unit. They usually combine several complicated logic operations, and decomposing these filters into separate parts would have an obfuscating effect.

ChannelUseflagCheckRad: Channel usage flag check for radiances
CloudDetectMinResidualAVHRR: Cloud detection using Minimum Residual Method for AVHRR
CloudDetectMinResidualIR: Cloud detection using Minimum Residual Method for IR Sensors
CLWMatchIndexMW: Cloud liquid water match index for microwave radiances
CLWRetMW: Retrieve cloud liquid water using MW channels (non-SSMIS version)
CLWRetMW_SSMIS: Cloud liquid water for SSMIS
CLWRetSymmetricMW: Estimates the actual Cloud Liquid Water (CLW) content from both model background and observed content
HydrometeorCheckAMSUA: AMSU-A cloud and precipitation checks
HydrometeorCheckATMS: ATMS cloud and precipitation checks
InterChannelConsistencyCheck: Inter-channel consistency check for radiances
NearSSTRetCheckIR: NCEP-GDAP near-sea-surface temperature IR retrieval
ObsErrorBoundIR: Observation error bound for gross check
ObsErrorBoundMW: Obseration error bounds for microwave radiances
ObsErrorFactorConventional: Compute observation error inflation factor for conventional observations based on vertical spacing
ObsErrorFactorLatRad: Observation error bound reduction within tropics
ObsErrorFactorQuotient: Reject observations based on comparing final observation error to initial error estimate
ObsErrorFactorSfcPressure: Inflate observation error for surface pressure (as in GSI)
ObsErrorFactorSituDependMW: Compute error inflation factors for AMSU-A and ATMS
ObsErrorFactorSurfJacobianRad: Inflate error using surface temperature and emissivity Jacobians
ObsErrorFactorTopoRad: GSI error inflation as a function of terrain height, channel, and transmittance
ObsErrorFactorTransmitTopRad: Satellite radiance observation error inflation factor
ObsErrorFactorWavenumIR: Observation error inflation for satellite infrared sensors
ObsErrorModelRamp: Parameterize observation error as a piecewise linear function
ObsErrorModelStepwiseLinear: GSI variant of ObsErrorModelRamp
ObsFunctionVelocity: Compute wind speed from u- and v- components
RONBAMErrInflate: Observation error inflation factor for GnssroBndNBAM
SatWindsLNVDCheck: log-normal vector difference (LNVD) between observed and model winds
SatWindsSPDBCheck: Wind gross error check
SCATRetMW: Retrieve Grody et al. scattering index from bias-adjusted channels over water surfaces
SetSurfaceType: Determine and output surface type for use with observation operator
TropopauseEstimate: First-guess extimate of tropopause pressure from climatology
WindDirAngleDiff: Compute wind direction angle different between observation and model
DrawValueFromFile: Derive values by interpolating an array loaded from a file, indexed by coordinates whose names correspond to ObsSpace variables
DrawObsErrorFromFile: Derive observation error values by interpolating an array loaded from a file, representing the variance or covariance matrix (of which only the diagonal elements are taken into account), indexed by coordinates whose names correspond to ObsSpace variables. This file can potentially contain a collection (“stack”) of such matrices.