DOI: 10.17894/ucph.89b622d6-f62f-43d5-b754-7a40748120b1
title: Doble reflection data at the North East Greenland Ice Stream

description: ##############################
### Radargrams used in analysis ###
##############################
 Radargrams for the four polarization configurations,
 Int0 = HH, Int1 = HV, Int2 = VV, Int3 = VH

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 20220628_UWB_Greenland_2022_combcombined_Int0_interp_dx5_cleaned_traced_splits.mat
 20220628_UWB_Greenland_2022_combcombined_Int1_interp_dx5_cleaned_traced_splits.mat
 20220628_UWB_Greenland_2022_combcombined_Int2_interp_dx5_cleaned_traced_splits.mat
 20220628_UWB_Greenland_2022_combcombined_Int3_interp_dx5_cleaned_traced_splits.mat
 20220630_UWB_Greenland_2022_combcombined_Int0_interp_dx5_cleaned_traced_splits.mat
 20220630_UWB_Greenland_2022_combcombined_Int1_interp_dx5_cleaned_traced_splits.mat
 20220630_UWB_Greenland_2022_combcombined_Int2_interp_dx5_cleaned_traced_splits.mat
 20220630_UWB_Greenland_2022_combcombined_Int3_interp_dx5_cleaned_traced_splits.mat
 20220701_UWB_Greenland_2022_combcombined_Int0_interp_dx5_cleaned_traced_splits.mat
 20220701_UWB_Greenland_2022_combcombined_Int1_interp_dx5_cleaned_traced_splits.mat
 20220701_UWB_Greenland_2022_combcombined_Int2_interp_dx5_cleaned_traced_splits.mat
 20220701_UWB_Greenland_2022_combcombined_Int3_interp_dx5_cleaned_traced_splits.mat
 20220706_UWB_Greenland_2022_combcombined_Int0_interp_dx5_cleaned_traced_splits.mat
 20220706_UWB_Greenland_2022_combcombined_Int1_interp_dx5_cleaned_traced_splits.mat
 20220706_UWB_Greenland_2022_combcombined_Int2_interp_dx5_cleaned_traced_splits.mat
 20220706_UWB_Greenland_2022_combcombined_Int3_interp_dx5_cleaned_traced_splits.mat
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 Relevant parameters:
 data: Amplitude data in dB
 long,lat: Longitutude,latitude 
 travel_time: Two-way travel time in micro seconds
 tnum: Trace number 

 ............................................................................................
 Radargrams can be plotted using the ImpDAR executable impplot.
 The command below will plot a radargram with the picked double reflections 
 impplot rg 20220701_UWB_Greenland_2022_combcombined_Int0_interp_dx5_cleaned_traced_splits.mat -picks

 ............................................................................................

#################################
### Picked double reflections ###
#################################
 Text files containing the picked relfections 
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 20220628_UWB_Greenland_2022_Int0_traced_splits.csv
 20220628_UWB_Greenland_2022_Int1_traced_splits.csv
 20220628_UWB_Greenland_2022_Int2_traced_splits.csv
 20220628_UWB_Greenland_2022_Int3_traced_splits.csv
 20220630_UWB_Greenland_2022_Int0_traced_splits.csv
 20220630_UWB_Greenland_2022_Int1_traced_splits.csv
 20220630_UWB_Greenland_2022_Int2_traced_splits.csv
 20220630_UWB_Greenland_2022_Int3_traced_splits.csv
 20220701_UWB_Greenland_2022_Int0_traced_splits.csv
 20220701_UWB_Greenland_2022_Int1_traced_splits.csv
 20220701_UWB_Greenland_2022_Int2_traced_splits.csv
 20220701_UWB_Greenland_2022_Int3_traced_splits.csv
 20220706_UWB_Greenland_2022_Int0_traced_splits.csv
 20220706_UWB_Greenland_2022_Int1_traced_splits.csv
 20220706_UWB_Greenland_2022_Int2_traced_splits.csv
 20220706_UWB_Greenland_2022_Int3_traced_splits.csv
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 Parameters:
 lat,lon: Latitude,longitude
 tnum: Trace number
 Layer_i_twtt Two-way travel time of the ith picked layer, the double reflections come in pairs (for example: Layer_0_twtt and Layer_1_twtt is one double reflection pair)

####################
### Full results ###
####################
 Text files containing the full results per traced double reflection
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 20220628_HH_results.csv 20220630_HH_results.csv 20220701_HH_results.csv 20220706_HH_results.csv
 20220628_VV_results.csv 20220630_VV_results.csv 20220701_VV_results.csv 20220706_VV_results.csv
 ---------------------------------------------------------------------------------------------------------

 Parameters:
 lat,lon: Latitude,longitude
 tnum: Trace number
 Layer_i_twtt Two-way travel time of the ith picked layer
 Layer_i_power Amplitude power of the ith picked layer
 dPower_i-j Difference in amplitude power, dPower_i-j = Layer_i_power-Layer_j_power, (i,j) = {(1,0),(3,2),(5,4),...)
 Noise_i_j Mean amplitude power between the ith and jth layer, used as a noise/background level
 lon_P,lat_P Latitude and longitude of the precision GPS located on the port side of the antenna panels
 lon_P,lat_P Latitude and longitude of the precision GPS located on the starboard side of the antenna panels
 dP_vs_angle_corr_i-j Pearson correlation coefficient between the along-track gradient of dPower_i-j and the along-track gradient of |phi|. Used to get the sign of phi
 dPower_corrected_i-j A corrected version of dPower_i-j, where the dPower from the HV and VH data is used to eliminate the dependency of L_x,L_y 
 phi_i-j Estimated orientation, phi, from the ith and jth layer 
 psi_abs_i-j The orientation converted to a cartesian reference frame, used for plotting
 psi_flow_i-j The orientation relative to the local flow vector 
 dTWTT_i-j The difference in two-way travel time of layer i and j 
 dEig_i-j The horizontal eigenvalue differences calculated from dTWTT_i-j 

####################
### Mean results ###
####################
 Text files containing the results averaged between all double reflections and HH and VV. 
 What is shown on the main results figure in the manuscript
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 20220628_mean_results.csv
 20220630_mean_results.csv
 20220701_mean_results.csv
 20220706_mean_results.csv
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 Parameters:
 lat,lon Latitude,longitude
 tnum Trace number
 psi_flow_mean The orientation relative to the local flow vector averaged over all picks and polarizations
 dEig_mean The horizontal eigenvalue difference averaged over all picks and polarizations