Data Quality Screening Service

Christopher Lynnes, GES DISC

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DQSS was funded by the NASA ACCESS Program

http://tw.rpi.edu/web/project/DQSS

What is the Data Quality Screening Service?

Quality Control information is typically provided with NASA Level 2 data

• Designed to be used in screening data
• IGNORE AT YOUR PERIL!
• Dry bias in AIRS Humidity for unscreened data
• High bias in MODIS aerosols over land for unscreened data
• Why so difficult?
• Bitfields, dataset-specific codelists, complicated screening relationships, obsolete documentation...

Data Quality Screening Service

Architecture of DQSS

User Interface

options

interpretations

data structures

quality views

Do it yourself demo

Want to just see the results?

Run in View->Slideshow and click on this link*

After you download the results, read them in Panoply : http://www.giss.nasa.gov/tools/panoply/

* Or, paste: http://airspar1u.ecs.nasa.gov/adaac-bin/OTF/HTTP_services.cgi?FILENAME=%2Fdata%2Fs4pa%2FAqua_AIRS_Level2%2FAIRX2RET.005%2F2008%2F254%2FAIRS.2008.09.10.189.L2.RetStd.v5.2.2.0.G08256113839.hdf&FORMAT=TmV0Q0RGLw&LABEL=AIRS.2008.09.10.189.L2.QCSUBX2RET.v5.2.2.0.G08256113839.nc&FLAGS=&SHORTNAME=AIRX2RET&SERVICE=SUBAIRSL2_DQS_NetCDF&VERSION=1.02&DATASET_VERSION=005&VARIABLES=H2OMMRStd.DoNotInclude%2CH2OMMRSat.DoNotInclude%2CtotCldH2OStd.DoNotInclude%2CtotH2OStd.Include.Good%2CpressStd.Include%2CpressH2O.Include%2CPSurfStd.Include%2CnSurfStd.Include%2CPBest.Include%2CPGood.Include%2CMWSurfClass.Include%2CQual_MW_Only_H2O.Include%2CQual_H2O.Include%2CH2OMMRStdErr.Include%2CtotH2OStdErr.Include%2Cnum_H2O_Func.Include%2CH2O_verticality.Include%2CtotCldH2OStdErr.Include%2CnBestStd.Include%2CnGoodStd.Include%2CtotH2OMWOnlyStd.DoNotInclude%2CH2OMMRSat_liquid.DoNotInclude%2CTSurfStd.DoNotInclude%2CTAirStd.DoNotInclude%2CTSurfAir.DoNotInclude%2CTAirMWOnlyStd.DoNotInclude%2CCldFrcStd.DoNotInclude%2CPCldTopStd.DoNotInclude%2Colr.DoNotInclude%2Cclrolr.DoNotInclude%2CemisIRStd.DoNotInclude%2CCO_total_column.DoNotInclude%2CCO_VMR_eff.DoNotInclude%2CCH4_total_column.DoNotInclude%2CCH4_VMR_eff.DoNotInclude%2CO3VMRStd.DoNotInclude%2CtotO3Std.DoNotInclude%2CnadirTAI.DoNotInclude%2Csat_lat.DoNotInclude%2Csatroll.DoNotInclude%2Cglintlon.DoNotInclude%2Cscan_node_type.DoNotInclude%2Cglintlat.DoNotInclude%2Csatpitch.DoNotInclude%2Csatheight.DoNotInclude%2Csatyaw.DoNotInclude%2Csat_lon.DoNotInclude%2Cglintgeoqa.DoNotInclude%2Cmoongeoqa.DoNotInclude%2Csatgeoqa.DoNotInclude%2Cdemgeoqa.DoNotInclude%2Csatazi.DoNotInclude%2Ctopog_err.DoNotInclude%2Csun_glint_distance.DoNotInclude%2Csolazi.DoNotInclude%2ClandFrac_err.DoNotInclude%2ClandFrac.DoNotInclude%2Ctopog.DoNotInclude%2Csolzen.DoNotInclude%2Cftptgeoqa.DoNotInclude%2Czengeoqa.DoNotInclude%2Csatzen.DoNotInclude%2CGP_Surface.DoNotInclude%2CTdiff_IR_4CC1.DoNotInclude%2CCC1_noise_eff_amp_factor.DoNotInclude%2CEmisMWStd.DoNotInclude%2CGP_Tropopause.DoNotInclude%2CEmisMWStdErr.DoNotInclude%2CSurf_Resid_Ratio.DoNotInclude%2CnumHingeSurf.DoNotInclude%2Call_spots_avg.DoNotInclude%2CCloud_Resid_Ratio.DoNotInclude%2CInitial_CC_score.DoNotInclude%2CsfcTbMWStd.DoNotInclude%2CTSurfdiff_IR_4CC1.DoNotInclude%2CCC1_Resid.DoNotInclude%2CRetQAFlag.DoNotInclude%2CAMSU_Chans_Resid.DoNotInclude%2Cspectral_clear_indicator.DoNotInclude%2CWater_Resid_Ratio.DoNotInclude%2CTdiff_IR_MW_ret.DoNotInclude%2CStartup.DoNotInclude%2CQual_Guess_PSurf.DoNotInclude%2CGP_Height_MWOnly.DoNotInclude%2CMW_ret_used.DoNotInclude%2CCCfinal_Noise_Amp.DoNotInclude%2CPTropopause.DoNotInclude%2Cretrieval_type.DoNotInclude%2CGP_Height.DoNotInclude%2CTotCld_4_CCfinal.DoNotInclude%2CCC_noise_eff_amp_factor.DoNotInclude%2CCCfinal_Resid.DoNotInclude%2CT_Tropopause.DoNotInclude%2CTemp_Resid_Ratio.DoNotInclude%2Cdust_flag.DoNotInclude%2CTSurfdiff_IR_4CC2.DoNotInclude%2Cnum_clear_spectral_indicator.DoNotInclude

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Results

Unscreened: totH2OStd_orig

Screened: totH2OStd

Bone-dry air in a hurricane???

Oh. Never mind...

Want to try more?

Go to http://mirador.gsfc.nasa.gov, and search on AIRX2RET (Level 2 AIRS data).

Coming soon for MODIS Level 2 Aerosols at LAADS!