Www.storm-surge.info Storm Surge Networking Forum 2013 18 th -20 th November 2013 The eSurge Coastal...

www.storm-surge.info Storm Surge Networking Forum 2013 18th-20th November 2013

The eSurgeCoastal Altimetry

ProcessorLuke West, Paolo Cipollini, Helen Snaith

AltimetryGeophysical Data•Sea Surface Height (TWLE)•Significant Wave Height•Wind Speed

Software Design Considerations•Multi-mission•Arbitrary Manipulation•Fast


www.storm-surge.info Storm Surge Networking Forum 2013 18th-20th November 2013Total Water-level Envelope

Total Water-level Envelope is computed as the sum of… •( Altitude – Range – MSS )•Ocean loading tide•Solid earth tide•Wet tropospheric correction•Dry tropospheric correction•GIM ionospheric correction


Altimetry

Retracking

Model

www.storm-surge.info Storm Surge Networking Forum 2013 18th-20th November 2013Retrackers

LRM retrackers…

BrownALES

Brown fit

SAR retracker…

SAMOSA3

Automatic.


MissionsENVISAT (LRM)CRYOSAT (SAR) +NRTCRYOSAT (LRM) +NRTJASON2 +NRTJASON1

Future missionsALTIKA +NRT


eSurge Altimetry ProcessorRealData

SyntheticData

AlternativeFields

SyntheticData

SyntheticData

Corrections

RealDataOriginal

Data

Output

ModularProcessing

Interpolation

chaos

Not THIS !!!

www.storm-surge.info Storm Surge Networking Forum 2013 18th-20th November 2013eSurge Altimetry Processor Pipeline

Process

Simple ProgramsExpressive Programs

Permits Automatic Auditing

Segment

SegmentHi Lo


Example Program

Segment

SegmentInput Select Output


Example Program

Segment

Segment

AcquireData

RetrackWaveforms

ReplaceField

InterpolateCorrection

computeTWLE

www.storm-surge.info Storm Surge Networking Forum 2013 18th-20th November 2013eSurge netCDF products

eSurge NRT Coastal Altimetryproducts are provided in netCDF.

All fields are provide at high rate.

Low rate fields sourced fromL1B or L2A are interpolatedlinearly to high rate.

Total Water-level Envelopeis computed as the sum of… •( Altitude – Range – MSS )•Ocean loading tide•Solid earth tide•Wet tropospheric correction•Dry tropospheric correction•GIM ionospheric correction

Source (CRYOSAT)

L1BL1BL1BL1BL1BL1BL1BL1B / L2AL1B / L2AL1B / L2AL1B / L2AL1B / L2AL1B / L2AL1B / L2AL1B / L2AL1B / L2AL1B / L2A

L2AL1B & L2A

Field list

TimeLatitudeLongitudeAltitudeUncorrected rangeCorrected rangeSignificant Wave HeightWet troposphericDry troposphericIonospheric (GIM)Ionospheric (model)Inverse barometricDynamic atmosphericOcean equilibrium tideOcean long period tideGeocentric polar tideSolid earth tideMean Sea SurfaceTotal Water-level Envelope

Process

Pass thruPass thruPass thruPass thruComputedComputedComputedInterpolatedInterpolatedInterpolatedInterpolatedInterpolatedInterpolatedInterpolatedInterpolatedInterpolatedInterpolatedInterpolatedComputed

eSurge Processor

example L2 enhanced CRYOSAT SAR output

netcdf L2A-SAR {dimensions: time = 21 ; samples = 20 ;variables: int hi_alt_cog(time, samples) ; hi_alt_cog:_FillValue = -2147483647 ; hi_alt_cog:scale_factor = 0.001 ;

hi_alt_cog:long_name = "high rate altitude of CoG above reference ellipsoid" ; hi_alt_cog:units = "m" ; short hi_corr_ib(time, samples) ; hi_corr_ib:_FillValue = -32767s ; hi_corr_ib:scale_factor = 0.001 ; hi_corr_ib:long_name = "high rate inverted barometer correction" ; hi_corr_ib:standard_name = "sea_surface_height_correction_due_to_air_pressure_at_low_frequency" ; hi_corr_ib:units = "m" ; short hi_corr_iono(time, samples) ; hi_corr_iono:_FillValue = -32767s ; hi_corr_iono:scale_factor = 0.001 ; hi_corr_iono:long_name = "high rate ionospheric correction" ; hi_corr_iono:standard_name = "altimeter_range_correction_due_to_ionosphere" ; hi_corr_iono:units = "m" ; short hi_corr_ssb(time, samples) ; hi_corr_ssb:_FillValue = -32767s ; hi_corr_ssb:scale_factor = 0.001 ; hi_corr_ssb:long_name = "high rate sea state bias correction" ; hi_corr_ssb:units = "m" ; short hi_corr_trop_dry_mod(time, samples) ; hi_corr_trop_dry_mod:_FillValue = -32767s ; hi_corr_trop_dry_mod:scale_factor = 0.001 ; hi_corr_trop_dry_mod:long_name = "high rate model dry tropospheric correction" ; hi_corr_trop_dry_mod:standard_name = "altimeter_range_correction_due_to_dry_troposphere" ; hi_corr_trop_dry_mod:units = "m" ; short hi_corr_trop_wet_mod(time, samples) ; hi_corr_trop_wet_mod:_FillValue = -32767s ; hi_corr_trop_wet_mod:scale_factor = 0.001 ; hi_corr_trop_wet_mod:long_name = "high rate model wet tropospheric correction" ; hi_corr_trop_wet_mod:standard_name = "altimeter_range_correction_due_to_wet_troposphere" ; hi_corr_trop_wet_mod:units = "m" ; int hi_h_mss(time, samples) ; hi_h_mss:_FillValue = -2147483647 ; hi_h_mss:scale_factor = 0.001 ; hi_h_mss:long_name = "high rate mean sea-surface height" ; hi_h_mss:units = "m" ; short hi_h_tide_load(time, samples) ; hi_h_tide_load:_FillValue = -32767s ; hi_h_tide_load:scale_factor = 0.001 ; hi_h_tide_load:long_name = "high rate tidal loading height" ; hi_h_tide_load:units = "m" ; short hi_h_tide_ocean_long_period(time, samples) ; hi_h_tide_ocean_long_period:_FillValue = -32767s ; hi_h_tide_ocean_long_period:scale_factor = 0.001 ; hi_h_tide_ocean_long_period:long_name = "high rate long period tide height" ; hi_h_tide_ocean_long_period:standard_name = "sea_surface_height_amplitude_due_to_equilibrium_ocean_tide" ; hi_h_tide_ocean_long_period:units = "m" ; short hi_h_tide_ocean_tot_geocen(time, samples) ; hi_h_tide_ocean_tot_geocen:_FillValue = -32767s ; hi_h_tide_ocean_tot_geocen:scale_factor = 0.001 ; hi_h_tide_ocean_tot_geocen:long_name = "hi rate total geocentric ocean tide height" ; hi_h_tide_ocean_tot_geocen:standard_name = "sea_surface_height_amplitude_due_to_geocentric_ocean_tide" ; hi_h_tide_ocean_tot_geocen:units = "m" ; short hi_h_tide_pole_geocen(time, samples) ; hi_h_tide_pole_geocen:_FillValue = -32767s ; hi_h_tide_pole_geocen:scale_factor = 0.001 ; hi_h_tide_pole_geocen:long_name = "high rate geocentric pole tide height" ; hi_h_tide_pole_geocen:standard_name = "sea_surface_height_amplitude_due_to_pole_tide" ; hi_h_tide_pole_geocen:units = "m" ; short hi_h_tide_solid_earth(time, samples) ; hi_h_tide_solid_earth:_FillValue = -32767s ; hi_h_tide_solid_earth:scale_factor = 0.001 ; hi_h_tide_solid_earth:long_name = "high rate solid earth tide height" ; hi_h_tide_solid_earth:standard_name = "sea_surface_height_amplitude_due_to_earth_tide" ; hi_h_tide_solid_earth:units = "m" ; short hi_h_twle_samosa(time, samples) ; hi_h_twle_samosa:_FillValue = -32767s ; hi_h_twle_samosa:scale_factor = 0.001 ; hi_h_twle_samosa:long_name = "high rate total water-level envelope from samosa processor" ; hi_h_twle_samosa:standard_name = "total_water_level_envelope" ; hi_h_twle_samosa:units = "m" ; float hi_lat(time, samples) ; hi_lat:_FillValue = 9.96921e+36f ; hi_lat:long_name = "high rate geodetic latitude" ; hi_lat:standard_name = "latitude" ; hi_lat:units = "degrees_north" ; float hi_lon(time, samples) ; hi_lon:_FillValue = 9.96921e+36f ; hi_lon:long_name = "high rate longitude" ; hi_lon:standard_name = "longitude" ; hi_lon:units = "degrees_east" ; int hi_range_samosa(time, samples) ; hi_range_samosa:_FillValue = -2147483647 ; hi_range_samosa:scale_factor = 0.001 ; hi_range_samosa:long_name = "high rate range from samosa retracker" ; hi_range_samosa:standard_name = "altimeter_range" ; hi_range_samosa:units = "m" ; short hi_swh_samosa(time, samples) ; hi_swh_samosa:_FillValue = -32767s ; hi_swh_samosa:scale_factor = 0.001 ; hi_swh_samosa:long_name = "high rate significant wave height from samosa processor" ; hi_swh_samosa:standard_name = "sea_surface_wave_significant_height" ; hi_swh_samosa:units = "m" ; hi_swh_samosa:source = "Samosa3 processor" ; hi_swh_samosa:ancillary_variables = "flgout" ; double hi_time(time, samples) ; hi_time:_FillValue = 9.96920996838687e+36 ; hi_time:long_name = "high rate time in sec since 2000-01-01" ; hi_time:standard_name = "time" ; hi_time:units = "sec since 2000-01-01" ; int alt_cog(time) ; alt_cog:_FillValue = -2147483647 ; alt_cog:scale_factor = 0.001 ; alt_cog:long_name = "altitude of CoG above reference ellipsoid" ; alt_cog:units = "m" ; alt_cog:source = "C2 MDSR field 9" ; short corr_ib(time) ; corr_ib:_FillValue = -32767s ; corr_ib:scale_factor = 0.001 ; corr_ib:long_name = "inverted barometer correction" ; corr_ib:standard_name = "sea_surface_height_correction_due_to_air_pressure_at_low_frequency" ; corr_ib:units = "m" ; corr_ib:source = "MDSR field 37" ; corr_ib:ancillary_variables = "flag_corr flag_corr_error" ; short corr_iono(time) ; corr_iono:_FillValue = -32767s ; corr_iono:scale_factor = 0.001 ; corr_iono:long_name = "ionospheric correction" ; corr_iono:standard_name = "altimeter_range_correction_due_to_ionosphere" ; corr_iono:units = "m" ; short corr_ssb(time) ; corr_ssb:_FillValue = -32767s ; corr_ssb:scale_factor = 0.001 ; corr_ssb:long_name = "sea state bias correction" ; corr_ssb:units = "m" ; short corr_trop_dry_mod(time) ; corr_trop_dry_mod:_FillValue = -32767s ; corr_trop_dry_mod:scale_factor = 0.001 ; corr_trop_dry_mod:long_name = "model dry tropospheric correction" ; corr_trop_dry_mod:standard_name = "altimeter_range_correction_due_to_dry_troposphere" ; corr_trop_dry_mod:units = "m" ; corr_trop_dry_mod:source = "MDSR field 35" ; corr_trop_dry_mod:ancillary_variables = "flag_corr flag_corr_error" ; short corr_trop_wet_mod(time) ; corr_trop_wet_mod:_FillValue = -32767s ; corr_trop_wet_mod:scale_factor = 0.001 ; corr_trop_wet_mod:long_name = "model wet tropospheric correction" ; corr_trop_wet_mod:standard_name = "altimeter_range_correction_due_to_wet_troposphere" ; corr_trop_wet_mod:units = "m" ; corr_trop_wet_mod:source = "MDSR field 36" ; corr_trop_wet_mod:ancillary_variables = "flag_corr flag_corr_error" ; int h_mss(time) ; h_mss:_FillValue = -2147483647 ; h_mss:scale_factor = 0.001 ; h_mss:long_name = "mean sea-surface height" ; h_mss:units = "m" ; short h_tide_load(time) ; h_tide_load:_FillValue = -32767s ; h_tide_load:scale_factor = 0.001 ; h_tide_load:long_name = "tidal loading height" ; h_tide_load:units = "m" ; short h_tide_ocean_long_period(time) ; h_tide_ocean_long_period:_FillValue = -32767s ; h_tide_ocean_long_period:scale_factor = 0.001 ; h_tide_ocean_long_period:long_name = "long period Tide height" ; h_tide_ocean_long_period:standard_name = "sea_surface_height_amplitude_due_to_equilibrium_ocean_tide" ; h_tide_ocean_long_period:units = "m" ; short h_tide_ocean_tot_geocen(time) ; h_tide_ocean_tot_geocen:_FillValue = -32767s ; h_tide_ocean_tot_geocen:scale_factor = 0.001 ; h_tide_ocean_tot_geocen:long_name = "total geocentric ocean tide height" ; h_tide_ocean_tot_geocen:standard_name = "sea_surface_height_amplitude_due_to_geocentric_ocean_tide" ; h_tide_ocean_tot_geocen:units = "m" ; short h_tide_pole_geocen(time) ; h_tide_pole_geocen:_FillValue = -32767s ; h_tide_pole_geocen:scale_factor = 0.001 ; h_tide_pole_geocen:long_name = "geocentric pole tide height" ; h_tide_pole_geocen:standard_name = "sea_surface_height_amplitude_due_to_pole_tide" ; h_tide_pole_geocen:units = "m" ; short h_tide_solid_earth(time) ; h_tide_solid_earth:_FillValue = -32767s ; h_tide_solid_earth:scale_factor = 0.001 ; h_tide_solid_earth:long_name = "solid earth tide height" ; h_tide_solid_earth:standard_name = "sea_surface_height_amplitude_due_to_earth_tide" ; h_tide_solid_earth:units = "m" ; short h_twle_samosa(time) ; h_twle_samosa:_FillValue = -32767s ; h_twle_samosa:scale_factor = 0.001 ; h_twle_samosa:long_name = "total water-level envelope from samosa processor" ; h_twle_samosa:standard_name = "total_water_level_envelope" ; h_twle_samosa:units = "m" ; float lat(time) ; lat:_FillValue = 9.96921e+36f ; lat:long_name = "geodetic latitude" ; lat:standard_name = "latitude" ; lat:units = "degrees_north" ; lat:source = "C2 MDSR field 7" ; float lon(time) ; lon:_FillValue = 9.96921e+36f ; lon:long_name = "longitude" ; lon:standard_name = "longitude" ; lon:units = "degrees_east" ; lon:source = "C2 MDSR field 8" ; int range_samosa(time) ; range_samosa:_FillValue = -2147483647 ; range_samosa:scale_factor = 0.001 ; range_samosa:long_name = "range from samosa retracker" ; range_samosa:standard_name = "altimeter_range" ; range_samosa:units = "m" ; short swh_samosa(time) ; swh_samosa:_FillValue = -32767s ; swh_samosa:scale_factor = 0.001 ; swh_samosa:long_name = "significant wave height from samosa processor" ; swh_samosa:standard_name = "sea_surface_wave_significant_height" ; swh_samosa:units = "m" ; double time(time) ; time:_FillValue = 9.96920996838687e+36 ; time:long_name = "time in sec since 2000-01-01" ; time:standard_name = "time" ; time:units = "sec since 2000-01-01" ; time:source = "C2 MDSR field 1" ;


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www.storm-surge.info Storm Surge Networking Forum 2013 18th-20th November 2013eSurge Coastal Altimetry


eSurge Coastal Altimetry

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Www.storm-surge.info Storm Surge Networking Forum 2013 18 th -20 th November 2013 The eSurge Coastal...

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