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.

AssignValueEqualChannels

Assign values to a variable, depending on a value of another (channel-by-channel)

BennartzScatIndex

Compute Bennartz scattering index from microwave channels

BgdDepartureAnomaly

Compute the background departure anomaly between two channels

ChannelUseflagCheckRad

Channel usage flag check for radiances

CloudCostFunction

Bayesian cost function for detecting cloud-affected radiances

CloudDetectMinResidualAVHRR

Cloud detection using Minimum Residual Method for AVHRR

CloudDetectMinResidualIR

Cloud detection using Minimum Residual Method for IR Sensors

CloudFirstGuessMinimumResidual

Cloud top pressure and effective cloud amount from satellite BTs.

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

Conditional

Create an array of ints, floats, strings or date times using a series of where clauses.

DateTimeOffset

Add an offset variable, with units of seconds, minutes or hours, to the MetaData/dateTime variable.

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.

DrawValueFromFile

Derive values by interpolating an array loaded from a file, indexed by coordinates whose names correspond to ObsSpace variables

FillAveragedProfileData

Copy values from an observed atmospheric profile to the same profile averaged onto model levels.

HydrometeorCheckAMSUA

AMSU-A cloud and precipitation checks

HydrometeorCheckATMS

ATMS cloud and precipitation checks

InterChannelConsistencyCheck

Inter-channel consistency check for radiances

MetOfficeRelativeHumidityCorrection

Produce correction to Met Office relative humidity H(x).

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

ObsErrorModelHumidity

Variant of ObsErrorModelStepwiseLinear for humidity observation error assignment

ObsErrorModelRamp

Parameterize observation error as a piecewise linear function

ObsErrorModelStepwiseLinear

GSI variant of ObsErrorModelRamp

ObsFunctionExponential

Compute exponential function of a variable

ObsFunctionLinearCombination

Compute linear combination of given variables weighted by given coefficients.

ObsFunctionSelectStatistic

Output all 0’s, except for 1 in locations corresponding (or closest) to the minimum, maximum, median or mean of the input variable within each record.

ObsFunctionStringManipulation

Perform an operation on a string to change its format i.e slice.

ObsFunctionVelocity

Compute wind speed from u- and v- components

OceanPressureToDepth

Convert an ocean pressure variable (Pa) to depth below surface (m)

ProfileAverageObsPressure

Fill values of pressure in profiles that have been averaged onto model levels.

ProfileLevelCount

Count the number of locations in each profile that satisfy a particular condition.

RONBAMErrInflate

Observation error inflation factor for GnssroBndNBAM

SatwindIndivErrors

Compute individual u- or v- component observation errors for Satwinds

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

SetSeaIceEmiss

Calculate MW emissivity for surfaces classified as Ice by AAPP.

TropopauseEstimate

First-guess extimate of tropopause pressure from climatology

WindDirAngleDiff

Compute wind direction angle different between observation and model