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View Envisat cycle dates per year

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Retracker Performance (Ice1, Ice2, Sea Ice)

Retracker Parameter Maps

The Mean Along Track values per cycle of each of the following parameters are mapped (smoothed at a 20km radius) for Antarctica and Greenland:

Ku Ice1 Backscatter 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice2 Backscatter 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku (Ice2-Ice1) Backscatter 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice2 Leading Edge Width 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice2 Trailing Edge Slope 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku (Ice2-Ice1) Range 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60

The Mean Crossover Difference per cycle of each of the following parameters are mapped (smoothed at a 20km radius) for Antarctica and Greenland:

Ku Ice1 Backscatter 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice2 Backscatter 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice1 Corrected Elevation 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice2 Corrected Elevation 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice2 Leading Edge Width 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60
Ku Ice2 Trailing Edge Slope 113 112 111 110 109 108 107 106 105 104 103 102 101 100
99 98 97 96 95 94 93 92 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60

Retrack Success Statistics

For each cycle of Envisat RA-2 Level-2 GDR data, the percentage of echoes successfully retracked by the ice1, ice2 and sea ice retrackers (as flagged in the L2 IGDR data) is calculated.

View Trend

View statistics per Envisat cycle:

Envisat Cycle

Total Global Echoes
from L2 IGDR

Global Echoes retracked
by Ice1 retracker

Global Echoes retracked
by Ice2 retracker

Global Echoes retracked
by Sea Ice retracker

Global Echoes retracked
by Ice1 retracker
S-band

Global Echoes retracked
by Ice2 retracker
S-band

% Global Trackable Echoes
from L1b Leading Edge Processing

113    GDR    (21/03/12 -> 19/04/12)

28645900 27475918 [95.92%] 26222888 [91.54%] 27503146 [96.01%] N/A N/A 90.05%

112    GDR    (20/02/12 -> 20/03/12)

46188660 44319819 [95.95%] 42291832 [91.56%] 44360222 [96.04%] N/A N/A 90.22%

111    GDR    (21/01/12 -> 19/02/12)

45300800 43478118 [95.98%] 41499052 [91.61%] 43514436 [96.06%] N/A N/A 90.06%

110    GDR    (22/12/11 -> 20/01/12)

45947360 44067142 [95.91%] 42076414 [91.58%] 44098694 [95.98%] N/A N/A 89.91%

109    GDR    (22/11/11 -> 21/12/11)

46272660 44373131 [95.89%] 42402041 [91.64%] 44399669 [95.95%] N/A N/A 89.95%

108    GDR    (22/10/11 -> 21/11/11)

46378040 44424973 [95.79%] 42490905 [91.62%] 44445015 [95.83%] N/A N/A 89.61%

107    GDR    (23/09/11 -> 22/10/11)

45974780 44030983 [95.77%] 42167541 [91.72%] 44037740 [95.79%] N/A N/A 89.45%

106    GDR    (24/08/11 -> 22/09/11)

44949600 43026688 [95.72%] 41136914 [91.52%] 43028382 [95.73%] N/A N/A 89.38%

105    GDR    (25/07/11 -> 23/08/11)

46331920 44346964 [95.72%] 42472980 [91.67%] 44346163 [95.71%] N/A N/A 89.32%

104    GDR    (25/06/11 -> 24/07/11)

46308600 44319650 [95.71%] 42449334 [91.67%] 44316691 [95.70%] N/A N/A 89.31%

103    GDR    (26/05/11 -> 24/06/11)

45558260 43655217 [95.82%] 41791848 [91.73%] 43659661 [95.83%] N/A N/A 89.79%

102    GDR    (26/04/11 -> 25/05/11)

45731260 43842259 [95.87%] 41901005 [91.62%] 43870084 [95.93%] N/A N/A 90.03%

101    GDR    (27/03/11 -> 25/04/11)

43669220 41884394 [95.91%] 39979012 [91.55%] 41925355 [96.01%] N/A N/A 90.00%

100    GDR    (25/02/11 -> 26/03/11)

45989720 44155269 [96.01%] 42117995 [91.58%] 44202519 [96.11%] N/A N/A 90.25%

99    GDR    (26/01/11 -> 24/02/11)

45226800 43423405 [96.01%] 41432867 [91.61%] 43465468 [96.11%] N/A N/A 90.30%

98    GDR    (27/12/10 -> 25/01/11)

46084120 44221388 [95.96%] 42204302 [91.58%] 44259843 [96.04%] N/A N/A 90.10%

97    GDR    (27/11/10 -> 26/12/10)

45837640 43967421 [95.92%] 41994833 [91.62%] 43997862 [95.99%] N/A N/A 90.05%

96    GDR    (28/10/10 -> 26/11/10)

46071320 44149673 [95.83%] 42183017 [91.56%] 44168952 [95.87%] N/A N/A 89.75%

95    GDR    (24/10/10 -> 27/10/10)

2212900 2110422 [95.37%] 2012113 [90.93%] 2111535 [95.42%] N/A N/A 89.36%

94    GDR    (19/10/10 -> 23/10/10)

4218700 4044705 [95.88%] 3874562 [91.84%] 4045784 [95.90%] N/A N/A 89.52%

93    GDR    (14/09/10 -> 18/10/10)

54099340 51777971 [95.71%] 49572974 [91.63%] 51791419 [95.73%] N/A N/A 89.58%

92    GDR    (10/08/10 -> 13/09/10)

54000520 51686394 [95.71%] 49475992 [91.62%] 51692503 [95.73%] N/A N/A 89.59%

91    GDR    (06/07/10 -> 09/08/10)

53894980 51560904 [95.67%] 49378815 [91.62%] 51564565 [95.68%] N/A N/A 89.60%

90    GDR    (01/06/10 -> 05/07/10)

53255880 51001440 [95.77%] 48822604 [91.68%] 51004521 [95.77%] N/A N/A 89.82%

89    GDR    (27/04/10 -> 31/05/10)

53432940 51205550 [95.83%] 48910137 [91.54%] 51236569 [95.89%] N/A N/A 89.96%

88    GDR    (23/03/10 -> 26/04/10)

53484340 51268124 [95.86%] 48901338 [91.43%] 51316636 [95.95%] N/A N/A 89.92%

87    GDR    (16/02/10 -> 22/03/10)

53753580 51575507 [95.95%] 49140647 [91.42%] 51624481 [96.04%] N/A N/A 90.23%

86    GDR    (12/01/10 -> 15/02/10)

52714400 50608377 [96.00%] 48217559 [91.47%] 50654772 [96.09%] N/A N/A 90.31%

85    GDR    (08/12/09 -> 11/01/10)

54083420 51876609 [95.92%] 49519466 [91.56%] 51915180 [95.99%] N/A N/A 89.95%

84    GDR    (03/11/09 -> 07/12/09)

53163540 50935222 [95.81%] 48692925 [91.59%] 50964209 [95.86%] N/A N/A 89.69%

83    GDR    (29/09/09 -> 02/11/09)

53137460 50873866 [95.74%] 48699618 [91.65%] 50892527 [95.78%] N/A N/A 89.57%

82    GDR    (25/08/09 -> 28/09/09)

53977360 51664956 [95.72%] 49442794 [91.60%] 51674592 [95.73%] N/A N/A 89.58%

81    GDR    (21/07/09 -> 24/08/09)

53428200 51131401 [95.70%] 48965553 [91.65%] 51135791 [95.71%] N/A N/A 89.60%

80    GDR    (16/06/09 -> 20/07/09)

53895660 51606433 [95.75%] 49428343 [91.71%] 51608954 [95.76%] N/A N/A 89.73%

79    GDR    (12/05/09 -> 15/06/09)

53262000 51055379 [95.86%] 48806962 [91.64%] 51081821 [95.91%] N/A N/A 89.96%

78    GDR    (07/04/09 -> 11/05/09)

52297220 50129086 [95.85%] 47838715 [91.47%] 50180027 [95.95%] N/A N/A 89.93%

77    GDR    (03/03/09 -> 06/04/09)

53924360 51727705 [95.93%] 49321720 [91.46%] 51784550 [96.03%] N/A N/A 90.15%

76    GDR    (27/01/09 -> 02/03/09)

53603540 51443530 [95.97%] 49051523 [91.51%] 51495837 [96.07%] N/A N/A 90.21%

75    GDR    (23/12/08 -> 26/01/09)

53726340 51538496 [95.93%] 49166622 [91.51%] 51584595 [96.01%] N/A N/A 90.06%

74    GDR    (18/11/08 -> 22/12/08)

52998620 50810848 [95.87%] 48537458 [91.58%] 50843616 [95.93%] N/A N/A 89.84%

73    GDR    (14/10/08 -> 17/11/08)

54086380 51813180 [95.80%] 49574320 [91.66%] 51836988 [95.84%] N/A N/A 89.72%

72    GDR    (09/09/08 -> 13/10/08)

53703160 51403889 [95.72%] 49201900 [91.62%] 51413218 [95.74%] N/A N/A 89.59%

71    GDR    (05/08/08 -> 08/09/08)

54110400 51805227 [95.74%] 49594915 [91.66%] 51810279 [95.75%] N/A N/A 89.65%

70    GDR    (30/06/08 -> 04/08/08)

54049140 51727849 [95.71%] 49535986 [91.65%] 51730319 [95.71%] N/A N/A 89.56%

69    GDR    (26/05/08 -> 30/06/08)

54102780 51839767 [95.82%] 49611167 [91.70%] 51849427 [95.84%] N/A N/A 89.93%

68    GDR    (21/04/08 -> 26/05/08)

53840160 51590548 [95.82%] 49281819 [91.53%] 51635505 [95.91%] N/A N/A 89.86%

67    GDR    (17/03/08 -> 21/04/08)

53294160 51109503 [95.90%] 48741136 [91.46%] 51166028 [96.01%] N/A N/A 90.15%

66    GDR    (11/02/08 -> 17/03/08)

53892200 51718546 [95.97%] 49319299 [91.51%] 51774290 [96.07%] N/A N/A 90.22%

65    GDR    (07/01/08 -> 11/02/08)

52309840 50227854 [96.02%] 47947316 [91.66%] 50276229 [96.11%] N/A N/A 90.40%

64    GDR    (03/12/07 -> 07/01/08)

50599300 48578874 [96.01%] 46427550 [91.76%] 48617425 [96.08%] 46388557 [91.68%] 45063171 [89.06%] 90.19%

63    GDR    (29/10/07 -> 03/12/07)

52438520 50285365 [95.89%] 48094491 [91.72%] 50314169 [95.95%] 48003714 [91.54%] 46533472 [88.74%] 89.89%

62    GDR    (24/09/07 -> 29/10/07)

49497000 47426841 [95.82%] 45438284 [91.80%] 47441626 [95.85%] 45311728 [91.54%] 44072683 [89.04%] 89.79%

61    GDR    (20/08/07 -> 24/09/07)

53344480 51118347 [95.83%] 48977829 [91.81%] 51125038 [95.84%] 48802630 [91.49%] 47539288 [89.12%] 89.74%

60    GDR    (16/07/07 -> 20/08/07)

53389140 51140009 [95.79%] 49007706 [91.79%] 51141791 [95.79%] 48815679 [91.43%] 47420459 [88.82%] 89.79%

59    GDR    (11/06/07 -> 16/07/07)

49933440 47855162 [95.84%] 45859178 [91.84%] 47856031 [95.84%] 44924786 [89.97%] 43635825 [87.39%] 89.94%

58    GDR    (07/05/07 -> 11/06/07)

53370360 51214598 [95.96%] 48965053 [91.75%] 51242562 [96.01%] 47784232 [89.53%] 46439831 [87.01%] 90.18%

57    GDR    (02/04/07 -> 07/05/07)

52467440 50347089 [95.96%] 48076578 [91.63%] 50391438 [96.04%] 47237926 [90.03%] 45919134 [87.52%] 90.17%

56    GDR    (26/02/07 -> 02/04/07)

47332080 45455552 [96.04%] 43392482 [91.68%] 45505257 [96.14%] 43334208 [91.55%] 42147815 [89.05%] 90.41%

55    GDR    (22/01/07 -> 26/02/07)

48334900 46451257 [96.10%] 44342328 [91.74%] 46494130 [96.19%] 44260418 [91.57%] 43055819 [89.08%] 90.47%

54    GDR    (18/12/06 -> 22/01/07)

52902800 50812714 [96.05%] 48526800 [91.73%] 50851899 [96.12%] 48420942 [91.53%] 47144850 [89.12%] 90.35%

53    GDR    (13/11/06 -> 18/12/06)

45181540 43356149 [95.96%] 41431250 [91.70%] 43382002 [96.02%] 40854642 [90.42%] 39719092 [87.91%] 90.05%

52    GDR    (09/10/06 -> 13/11/06)

52671180 50493223 [95.86%] 48312828 [91.73%] 50511232 [95.90%] 46971924 [89.18%] 45423575 [86.24%] 89.78%

51    GDR    (04/09/06 -> 09/10/06)

45749640 43838481 [95.82%] 41976895 [91.75%] 43848118 [95.84%] 41172445 [90.00%] 39935631 [87.29%] 89.68%

50    GDR    (31/07/06 -> 04/09/06)

53381580 51130292 [95.78%] 48972675 [91.74%] 51135905 [95.79%] 48108000 [90.12%] 46562639 [87.23%] 89.76%

49    GDR    (26/06/06 -> 31/07/06)

53350860 51090019 [95.76%] 48933121 [91.72%] 51095126 [95.77%] 48200815 [90.35%] 46846474 [87.81%] 89.70%

48    GDR    (22/05/06 -> 26/06/06)

7239220 6942232 [95.90%] 6652290 [91.89%] 6942583 [95.90%] 6613833 [91.36%] 6433390 [88.87%] 89.82%

47    GDR    (17/04/06 -> 22/05/06)

32870380 31589569 [96.10%] 30255248 [92.04%] 31585173 [96.09%] 30181186 [91.82%] 29387204 [89.40%] 90.04%

46    GDR    (13/03/06 -> 17/04/06)

49415360 47435973 [95.99%] 45246664 [91.56%] 47484673 [96.09%] 43856673 [88.75%] 42555425 [86.12%] 90.29%

45    GDR    (06/02/06 -> 13/03/06)

52015220 49980660 [96.09%] 47691572 [91.69%] 50028209 [96.18%] 46982112 [90.32%] 45653249 [87.77%] 90.45%

44    GDR    (02/01/06 -> 06/02/06)

51945400 49877213 [96.02%] 47608705 [91.65%] 49918437 [96.10%] 46802007 [90.10%] 45510119 [87.61%] 90.32%

43    GDR    (28/11/05 -> 02/01/06)

52624920 50495569 [95.95%] 48241407 [91.67%] 50536274 [96.03%] 47130439 [89.56%] 45724661 [86.89%] 90.12%

42    GDR    (24/10/05 -> 28/11/05)

48871780 46853468 [95.87%] 44812027 [91.69%] 46878708 [95.92%] 43465233 [88.94%] 41970389 [85.88%] 89.91%

41    GDR    (19/09/05 -> 24/10/05)

52647920 50440179 [95.81%] 48299233 [91.74%] 50455301 [95.84%] 46433695 [88.20%] 44877693 [85.24%] 89.77%

40    GDR    (15/08/05 -> 19/09/05)

52210480 50010289 [95.79%] 47893754 [91.73%] 50017300 [95.80%] 46601724 [89.26%] 45183571 [86.54%] 89.75%

39    GDR    (11/07/05 -> 15/08/05)

51976500 49777939 [95.77%] 47695662 [91.76%] 49781239 [95.78%] 45524388 [87.59%] 44119987 [84.88%] 89.78%

38    GDR    (06/06/05 -> 11/07/05)

53106600 50885984 [95.82%] 48740380 [91.78%] 50887927 [95.82%] 47609881 [89.65%] 46329962 [87.24%] 89.91%

37    GDR    (02/05/05 -> 06/06/05)

52017440 49907761 [95.94%] 47709959 [91.72%] 49938124 [96.00%] 46593454 [89.57%] 45271494 [87.03%] 90.14%

36    GDR    (28/03/05 -> 02/05/05)

51822940 49724928 [95.95%] 47449095 [91.56%] 49778776 [96.06%] 46803328 [90.31%] 45448029 [87.70%] 90.20%

35    GDR    (21/02/05 -> 28/03/05)

52980560 50885536 [96.05%] 48514818 [91.57%] 50941400 [96.15%] 47500648 [89.66%] 46070957 [86.96%] 90.34%

34    GDR    (17/01/05 -> 21/02/05)

47782960 45905492 [96.07%] 43783918 [91.63%] 45949300 [96.16%] 42782145 [89.53%] 41587081 [87.03%] 90.34%

33    GDR    (13/12/04 -> 17/01/05)

52115640 50031910 [96.00%] 47733407 [91.59%] 50074075 [96.08%] 46687007 [89.58%] 45294015 [86.91%] 90.21%

32    GDR    (08/11/04 -> 13/12/04)

49825940 47669525 [95.67%] 45575220 [91.47%] 47711733 [95.76%] 44676959 [89.67%] 43291317 [86.89%] 89.49%

31    GDR    (04/10/04 -> 08/11/04)

52752140 50580215 [95.88%] 48417997 [91.78%] 50600783 [95.92%] 46698479 [88.52%] 45278757 [85.83%] 89.82%

30    GDR    (30/08/04 -> 04/10/04)

52181980 49974934 [95.77%] 47830517 [91.66%] 49985099 [95.79%] 47447098 [90.93%] 46137631 [88.42%] 89.66%

29    GDR    (26/07/04 -> 30/08/04)

51713700 49490195 [95.70%] 47362792 [91.59%] 49494554 [95.71%] 45774338 [88.51%] 44435925 [85.93%] 89.44%

28    GDR    (21/06/04 -> 26/07/04)

46183560 44218387 [95.74%] 42330061 [91.66%] 44220652 [95.75%] 40308354 [87.28%] 39213435 [84.91%] 89.68%

27    GDR    (17/05/04 -> 21/06/04)

51738040 49617555 [95.90%] 47455594 [91.72%] 49638251 [95.94%] 43884251 [84.82%] 42551210 [82.24%] 89.93%

26    GDR    (12/04/04 -> 17/05/04)

46267140 44390870 [95.94%] 42362183 [91.56%] 44431949 [96.03%] 41170275 [88.98%] 39995469 [86.44%] 90.06%

25    GDR    (08/03/04 -> 12/04/04)

53590400 51427692 [95.96%] 49031732 [91.49%] 51480693 [96.06%] 47258072 [88.18%] 45834329 [85.53%] 90.12%

24    GDR    (02/02/04 -> 08/03/04)

52147300 50614262 [97.06%] 47727635 [91.52%] 51445571 [98.65%] 45960963 [88.14%] 44177816 [84.72%] 90.34%

23    GDR    (29/12/03 -> 02/02/04)

52687400 51139977 [97.06%] 48217999 [91.52%] 51971668 [98.64%] 46016798 [87.34%] 44099532 [83.70%] 90.13%

22    GDR    (24/11/03 -> 29/12/03)

42564020 41328284 [97.10%] 38976483 [91.57%] 41981088 [98.63%] 37289859 [87.61%] 35744321 [83.98%] 90.13%

21    GDR    (20/10/03 -> 24/11/03)

51645300 50146914 [97.10%] 47291478 [91.57%] 50927080 [98.61%] 45894364 [88.86%] 43965996 [85.13%] 89.59%

20    GDR    (15/09/03 -> 20/10/03)

50596800 49141853 [97.12%] 46471894 [91.85%] 49817622 [98.46%] 44119571 [87.20%] 42286392 [83.58%] 90.41%

19    GDR    (11/08/03 -> 15/09/03)

48172060 46761146 [97.07%] 44166385 [91.68%] 47460806 [98.52%] 41906940 [86.99%] 40237294 [83.53%] 89.48%

18    GDR    (07/07/03 -> 11/08/03)

50433920 48954670 [97.07%] 46218262 [91.64%] 49680483 [98.51%] 43794432 [86.84%] 42006032 [83.29%] 89.71%

17    GDR    (02/06/03 -> 07/07/03)

47764700 46368879 [97.08%] 43365330 [90.79%] 47056692 [98.52%] 43012868 [90.05%] 41080624 [86.01%] 90.15%

16    GDR    (28/04/03 -> 02/06/03)

43436480 42142269 [97.02%] 39770847 [91.56%] 42810919 [98.56%] 38458120 [88.54%] 37029030 [85.25%] 90.25%

15    GDR    (24/03/03 -> 28/04/03)

26958840 25862451 [95.93%] 24683293 [91.56%] 25884009 [96.01%] 23358839 [86.65%] 22670022 [84.09%] 90.06%

14    GDR    (17/02/03 -> 24/03/03)

42298580 40600598 [95.99%] 38881906 [91.92%] 40611997 [96.01%] 36322714 [85.87%] 35249650 [83.34%] Not available yet

13    GDR    (13/01/03 -> 17/02/03)

45231760 43451932 [96.07%] 41468874 [91.68%] 43490154 [96.15%] 41224224 [91.14%] 40110539 [88.68%] Not available yet

12    GDR    (09/12/02 -> 13/01/03)

52984080 50861778 [95.99%] 48522845 [91.58%] 50898871 [96.06%] 47043171 [88.79%] 45607835 [86.08%] Not available yet

11    GDR    (04/11/02 -> 09/12/02)

49814420 47725412 [95.81%] 45592340 [91.52%] 47749430 [95.85%] 45242832 [90.82%] 43985036 [88.30%] Not available yet

10    GDR    (30/09/02 -> 04/11/02)

47619940 45522753 [95.60%] 43522988 [91.40%] 45535597 [95.62%] 29097263 [61.10%] 27526145 [57.80%] Not available yet

Please refer any problems with this site to jag@mssl.ucl.ac.uk.