updated ref_pt description

ATL11_output_attrs.csv

@@ -2,7 +2,7 @@ group,field,units,dimensions,datatype,description,long_name,source
 ROOT,cycle_number,counts,N_cycles,int8,"""cycle number""","""cycle number""","""ATL06"""
 ROOT,latitude,degrees North,N_pts,Float64,"""center latitude based on selected segments""","""latitude""","""ATL06 segments"""
 ROOT,longitude,degrees East,N_pts,Float64,"""center longitude based on selected segments""","""longitude""","""ATL06 segments"""
-ROOT,ref_pt,counts,N_pts,int32,"""the reference point number, m, counted from the equator crossing of the RGT""","""reference point number""","""ATL06"""
+ROOT,ref_pt,counts,N_pts,int32,"""The reference point is the segment_id corresponding to the center of the ATL06 data used for each ATL11 point. Segment_id is counted from the equator crossing of the RGT, with one segment every 20m.""","""reference point number""","""ATL06"""
 ROOT,delta_time,seconds,"N_pts, N_cycles",Float64,"""mean GPS time for the segments for each pass""","""delta time""","""ATL06"""
 ROOT,h_corr,meters,"N_pts, N_cycles",Float64,"""the mean corrected height""","""mean corrected height""","""derived, ATL11 algorithm"""
 ROOT,h_corr_sigma,meters,"N_pts, N_cycles",Float64,"""the formal error in the corrected height""","""mean corrected height error""","""derived, ATL11 algorithm"""
@@ -20,6 +20,7 @@ ref_surf,poly_coeffs,1,"N_pts, N_coeffs",Float64,"""polynomial coefficients (up
 ref_surf,poly_coeffs_sigma,1,"N_pts, N_coeffs",Float64,"""formal errors for the polynomial coefficients""","""polynomial coefficients error""","""derived, ATL11 algorithm"""
 ref_surf,poly_exponent_x,counts,N_coeffs,int8,"""exponents for the x factors in the surface polynomial""","""polynomial x exponents""","""derived, ATL11 algorithm"""
 ref_surf,poly_exponent_y,counts,N_coeffs,int8,"""exponents for the y factors in the surface polynomial""","""polynomial y exponents""","""derived, ATL11 algorithm"""
+ref_surf,ref_pt,counts,N_pts,int32,"""Ref point number, counted from the equator crossing along the RGT.""","""reference point number, segment_id""","""ATL06"""
 ref_surf,x_atc,meters,N_pts,Float64,"""Along-track coordinate of the reference point, measured along the RGT from its first equator crossing.""","""Along track distance""","""ATL06"""
 ref_surf,y_atc,meters,N_pts,Float64,"""Across-track coordinate of the reference point, measured along the RGT from its first equator crossing.""","""Across track distance""","""ATL06"""
 ref_surf,rgt_azimuth,degrees,N_pts,Float64,"""Reference track azimuth, in degrees east of local north""","""RGT azimuth""","""ATL06"""
@@ -31,6 +32,7 @@ ref_surf,misfit_chi2r,meters,N_pts,Float64,"""misfit chi square, divided by the
 ref_surf,misfit_RMS,meters,N_pts,Float64,"""RMS misfit for the surface-polynomial fit""","""misfit RMS""","""derived, ATL11 algorithm"""
 ref_surf,dem_h,meters,N_pts,Float64,"""DEM elevation, derived from ATL06 /gtxx/atl06_segments/dem/dem_h""","""DEM elevation""","""ATL06"""
 ref_surf,fit_quality,1,N_pts,int8,"""Indicates quality of the fit: 0: no problem identified, 1: One or more polynomial coefficients has an error of 2 or larger, 2: One or more surface slope components is greater than 0.02, 3: both 1 and 2""","""fit quality summary""","""derived, ATL11 algorithm"""
+cycle_stats,cycle_number,counts,N_cycles,int8,"""cycle number""","""cycle number""","""ATL06"""
 cycle_stats,atl06_summary_zero_count,counts,"N_pts, N_cycles",int8,"""Number of segments with ATL06_quality_summary==0 (0 indicates the best-quality data)""","""ATL06 best quality count""","""ATL06"""
 cycle_stats,h_rms_misfit,meters,"N_pts, N_cycles",Float64,"""Weighted-average RMS misfit between PE heights and along-track land-ice segment fit""","""weighted average RMS fit error""","""derived, ATL11 algorithm"""
 cycle_stats,r_eff,1,"N_pts, N_cycles",Float64,"""Weighted-average effective, uncorrected reflectance for each pass.""","""weighted average reflectance""","""derived, ATL11 algorithm"""
@@ -41,7 +43,8 @@ cycle_stats,cloud_flg_asr,1,"N_pts, N_cycles",int8,"""Minimum apparent-surface-r
 cycle_stats,bsnow_h,meters,"N_pts, N_cycles",Float64,"""Weighted-average  blowing snow layer height for each cycle""","""weighted average blowing snow height""","""ATL06"""
 cycle_stats,bsnow_conf,1,"N_pts, N_cycles",int8,"""Maximum bsnow_conf flag from ATL06: indicates the greatest (among segments) confidence flag for presence of blowing snow for each cycle""","""maxmimum blowing snow confidence flag""","""ATL06"""
 cycle_stats,x_atc,meters,"N_pts, N_cycles",Float64,"""weighted average of pair-center RGT x coordinates for each cycle ""","""weighted average rgt x-coordinates""","""ATL06"""
-cycle_stats,y_atc,meters,"N_pts, N_cycles",Float64,"""weighted mean of pair-center RGT y coordinates for each cycle""","""weighted average rgt y-coordinates"""
+cycle_stats,y_atc,meters,"N_pts, N_cycles",Float64,"""weighted mean of pair-center RGT y coordinates for each cycle""","""weighted average rgt y-coordinates""",
+cycle_stats,ref_pt,counts,N_pts,int32,"""Ref point number, counted from the equator crossing along the RGT.""","""reference point number, segment_id""","""ATL06"""
 cycle_stats,seg_count,counts,"N_pts, N_cycles",int32,"""Number of segments marked as valid for each cycle.  Equal to 0 for those cycles not included in the reference-surface shape fit.""","""number valid segments""","""ATL06"""
 cycle_stats,min_signal_selection_source,1,"N_pts, N_cycles",int8,"""Minimum of the ATL06 signal_selection_source value (indicates the highest-quality segment in the cycle)""","""minimum signal selection source""","""ATL06"""
 cycle_stats,min_snr_significance,1,"N_pts, N_cycles",Float64,"""Minimum of SNR_significance (indicates the quality of the best segment in the cycle)""","""minumum signal-noise ration significance""","""ATL06"""
@@ -60,4 +63,4 @@ crossing_track_data,cycle_number,counts,Nxo,int8,"""Cycle number for the crossin
 crossing_track_data,rgt,counts,Nxo,int32,"""The RGT number for the crossing data""","""crossover reference ground track""","""ATL06"""
 crossing_track_data,spot_crossing,counts,Nxo,int8,"""The spot number for the crossing data""","""crossover spot number""","""ATL06"""
 crossing_track_data,atl06_quality_summary,1,Nxo,int8,"""Quality flag for the crossing data derived from ATL06.  0 indicates no problems detected, 1 indicates potential problems""","""crossover quality flag""","""ATL06"""
-crossing_track_data,along_track_rss,meters,Nxo,Float64,"""Root sum of the squared differences between the heights of the endpoints for the current segment and the centers of the previous and next segments""","""root sum of squared differences in crossover heights""","""derived, ATL11 algorithm"""
+crossing_track_data,along_track_rss,meters,Nxo,Float64,"""Root sum of the squared differences between the heights of the endpoints for the current segment and the centers of the previous and next segments""","""root sum of squared differences in crossover heights""","""derived, ATL11 algorithm"""