GLA13 Data Dictionary (pdf) - ICESat - NASA

More documents

Recommendations

Info

GLAH13 Product Data Dictionary1/30/13 1:04 PMThis group contains reflectivity information.LabelDatatype(Dimensions)long_name(standard_name)units description source coordinatesd_localSolarTimeDOUBLE(UNLIMITED)Local apparent solar time(NOT_SET)seconds Local apparent solar time. Rel 33GLASBinaryDataDS_UTCTime_1d_AzimuthDOUBLE(UNLIMITED)Local Azimuth(solar_azimuth_angle)degreesMean azimuth measured clockwise from north basedon latitude, longitude, and elevation of a 1 secondinterval of the trace of the ground footprint-center.Rel 33GLASBinaryDataDS_UTCTime_1d_SolAngDOUBLE(UNLIMITED)Solar Angle(NOT_SET)degreesSolar Angle above or below the plane tangent to theellipsoid surface at the laser spot. Positive valuesmean the sun is above the horizon, while negativevalues mean it is below the horizon. The effect ofatmospheric refraction is not included. This is a lowprecisionvalue, with approximately one degreeaccuracy.Rel 33GLASBinaryDataDS_UTCTime_1d_reflCor_atmDOUBLE(UNLIMITED)Reflectivity Correction Factor ForAtmospheric Effects(NOT_SET)NOT_SET This reflectance correction factor is calculated as 1 /e^(-2(tc+ta+tp+tm)), where tc is the cloud (column)integrated optical depth, ta is the aerosol (column)integrated optical depth, tp is the planetary boundarylayer optical depth, and tm is the molecular opticaldepth. tm is a constant equal to -log(gd_T_RTatm)/2,where gd_T_RTatm = 0.98 is defined inconst_elev_mod.f90 or read from ANC07-03. Theattenuation correction factor has been corrected formultiple scattering. The reflectance has beencorrected for waveform saturation.Rel 33GLASBinaryDataDS_UTCTime_1Group: Data_1HZ/Elevation_FlagsThis group contains flags indicating the quality or suitability of elevation data.LabelDatatype(Dimensions)long_name(standard_name)units description source coordinatessurf_ld_flgINTEGER_1(UNLIMITED)Region Type(NOT_SET)NOT_SETRegion type flag; indicates presence of land.flag_valuesflag_meanings0, 1 no_land landRel 33GLASBinaryDataDS_UTCTime_1surf_si_flgINTEGER_1(UNLIMITED)Region Type(NOT_SET)NOT_SETRegion type Sea Ice flag; indicates the presense of seaice.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1 no_sea_ice sea_icesurf_oc_flgINTEGER_1(UNLIMITED)Region Type(NOT_SET)NOT_SETRegion type ocean flag; indicates the presence ofocean.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1 no_ocean oceansurf_is_flgINTEGER_1(UNLIMITED)Region Type(NOT_SET)NOT_SETRegion type Ice Sheet flag; indicates the presence of icesheet.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1 no_ice_sheet ice_sheetrng_ldtide_flgINTEGER_1(UNLIMITED)Range Correction Flag(NOT_SET)NOT_SETLoad tides flag; Indicates if a correction for the dynamiceffect of load tides has been applied to the range beforethe elevation was calculated.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1 applied not_appliedrng_octide_flgINTEGER_1(UNLIMITED)Range Correction Flag(NOT_SET)NOT_SETOcean tides flag; Indicates if a correction for thedynamic effect of ocean tides has been applied to therange before the elevation was calculated.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1 applied not_appliedrng_setide_flagINTEGER_1(UNLIMITED)Range Correction Flag(NOT_SET)NOT_SETSolid earth tides flag; Indicates if a correction for thedynamic effect of solid earth tides has been applied tothe range before the elevation was calculated.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_1file:///Volumes/Users/jelee1/Development/glashdf/glas_hdf/doc/GLAH13_data_dict.htmlPage 8 of 33
GLAH13 Product Data Dictionary1/30/13 1:04 PMflag_valuesflag_meanings0, 1 applied not_appliedrng_drytrop_flgINTEGER_1(UNLIMITED)Range Correction Flag(NOT_SET)NOT_SETDry troposphere flag; Indicates if a correction forpropagation errors due to the dry troposphere wasapplied to the range before the elevation was calculated.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1 applied not_appliedrng_wettrop_flgINTEGER_1(UNLIMITED)Range Correction Flag(NOT_SET)NOT_SETWet troposphere flag Indicates if a correction forpropagation errors due to the wet troposphere wasapplied to the range before the elevation was calculated.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1 applied not_appliedrng_intbias_flgINTEGER_1(UNLIMITED)Range Correction Flag(NOT_SET)NOT_SETInternal range bias flag; Indicates if the internal rangebias was applied to the range before the elevation wascalculated and if the value of d_refRng on the recordhas this correction applied.Rel 33GLASBinaryDataDS_UTCTime_1flag_valuesflag_meanings0, 1 applied not_appliedrng_plbias_flgINTEGER_1(UNLIMITED)Range Correction Flag(NOT_SET)NOT_SETPost-launch range bias flag; Indicates if the post-launchrange bias was applied to the range before the elevationwas calculated and if the value of d_refRng on therecord has this correction applied.Rel 33GLASBinaryDataDS_UTCTime_1flag_valuesflag_meanings0, 1 applied not_appliedrng_model_flgINTEGER_1(UNLIMITED)Correction Status Flag(NOT_SET)NOT_SETGeophysical corrections flag; Indicates if the load andocean tides are from global model, regional model no. 1,regional model no. 2, or regional model no. 3.flag_valuesflag_meaningsRel 33GLASBinaryDataDS_UTCTime_10, 1, 2, 3 global model_1 model_2model_3rng_oldmet_flgINTEGER_1(UNLIMITED)Correction Status Flag(NOT_SET)NOT_SETGeophysicat corrections flag; Indicates if tropospherecorrections are based on 6hr NCEP grids surroundingdata, 6hr NCEP grids but at least one was >6 but
Page 3: GLAH13 Product Data Dictionary1/30/
Page 11 and 12: GLAH13 Product Data Dictionary1/30/

GLA13 Data Dictionary (pdf) - ICESat - NASA

Create successful ePaper yourself

Delete template?

Save as template?