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RA-2 Event History

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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
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
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
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
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
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
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
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
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 Ice1 Corrected Elevation
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 Corrected Elevation
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
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
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

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 GDR

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

92    GDR    (10/08/10 -> 13/09/10)

54000520 51686984 [95.72%] 49479597 [91.63%] 51693037 [95.73%] 27999301 [51.85%] 28727964 [53.20%]

91    GDR    (06/07/10 -> 09/08/10)

53897640 51563056 [95.67%] 49381232 [91.62%] 51566765 [95.68%] 28122186 [52.18%] 28813682 [53.46%]

90    GDR    (01/06/10 -> 05/07/10)

53893180 51613632 [95.77%] 49414983 [91.69%] 51616909 [95.78%] 28296890 [52.51%] 29328180 [54.42%]

89    GDR    (27/04/10 -> 31/05/10)

54116680 51870022 [95.85%] 49559955 [91.58%] 51901767 [95.91%] 27195700 [50.25%] 29161734 [53.89%]

88    GDR    (23/03/10 -> 26/04/10)

53694640 51473164 [95.86%] 49130102 [91.50%] 51521881 [95.95%] 26498733 [49.35%] 28751667 [53.55%]

87    GDR    (16/02/10 -> 22/03/10)

53970740 51787012 [95.95%] 49394183 [91.52%] 51836376 [96.05%] 27127870 [50.26%] 29391504 [54.46%]

86    GDR    (12/01/10 -> 15/02/10)

52822760 50709862 [96.00%] 48380975 [91.59%] 50756376 [96.09%] 26608216 [50.37%] 28763404 [54.45%]

85    GDR    (08/12/09 -> 11/01/10)

54083420 51876663 [95.92%] 49519518 [91.56%] 51915234 [95.99%] 26934433 [49.80%] 28980014 [53.58%]

84    GDR    (03/11/09 -> 07/12/09)

53058060 50834012 [95.81%] 48595510 [91.59%] 50862958 [95.86%] 26852991 [50.61%] 28602570 [53.91%]

83    GDR    (29/09/09 -> 02/11/09)

53136460 50872898 [95.74%] 48698650 [91.65%] 50891559 [95.78%] 28612832 [53.85%] 29394615 [55.32%]

82    GDR    (25/08/09 -> 28/09/09)

53872220 51567103 [95.72%] 49352149 [91.61%] 51576718 [95.74%] 29840621 [55.39%] 30284411 [56.22%]

81    GDR    (21/07/09 -> 24/08/09)

53425560 51128862 [95.70%] 48963080 [91.65%] 51133251 [95.71%] 30440674 [56.98%] 30025633 [56.20%]

80    GDR    (16/06/09 -> 20/07/09)

53818860 51529108 [95.75%] 49351673 [91.70%] 51531635 [95.75%] 30197543 [56.11%] 29784763 [55.34%]

79    GDR    (12/05/09 -> 15/06/09)

53262000 51055409 [95.86%] 48806990 [91.64%] 51081851 [95.91%] 28730321 [53.94%] 29081201 [54.60%]

78    GDR    (07/04/09 -> 11/05/09)

52296100 50127988 [95.85%] 47837617 [91.47%] 50178929 [95.95%] 26907041 [51.45%] 28414528 [54.33%]

77    GDR    (03/03/09 -> 06/04/09)

53924360 51727726 [95.93%] 49321741 [91.46%] 51784571 [96.03%] 27611823 [51.20%] 29247675 [54.24%]

76    GDR    (27/01/09 -> 02/03/09)

53394560 51241617 [95.97%] 48857957 [91.50%] 51293682 [96.07%] 27277361 [51.09%] 29084476 [54.47%]

75    GDR    (23/12/08 -> 26/01/09)

53271300 51103301 [95.93%] 48753690 [91.52%] 51148714 [96.02%] 26744253 [50.20%] 28807042 [54.08%]

74    GDR    (18/11/08 -> 22/12/08)

53077180 50887408 [95.87%] 48611625 [91.59%] 50920180 [95.94%] 26907961 [50.70%] 28815796 [54.29%]

73    GDR    (14/10/08 -> 17/11/08)

54032200 51761032 [95.80%] 49524090 [91.66%] 51784870 [95.84%] 28475123 [52.70%] 29574781 [54.74%]

72    GDR    (09/09/08 -> 13/10/08)

53703160 51403890 [95.72%] 49201901 [91.62%] 51413219 [95.74%] 29993708 [55.85%] 30007965 [55.88%]

71    GDR    (05/08/08 -> 08/09/08)

54101620 51797123 [95.74%] 49587296 [91.66%] 51802216 [95.75%] 31249400 [57.76%] 30346100 [56.09%]

70    GDR    (30/06/08 -> 04/08/08)

54049140 51727978 [95.71%] 49535809 [91.65%] 51730625 [95.71%] 31406582 [58.11%] 30173944 [55.83%]

69    GDR    (26/05/08 -> 30/06/08)

54102780 51840112 [95.82%] 49611242 [91.70%] 51849974 [95.84%] 30791489 [56.91%] 30247956 [55.91%]

68    GDR    (21/04/08 -> 26/05/08)

53808040 51559010 [95.82%] 49251358 [91.53%] 51603852 [95.90%] 29877914 [55.53%] 29613671 [55.04%]

67    GDR    (17/03/08 -> 21/04/08)

53328960 51143977 [95.90%] 48775944 [91.46%] 51200356 [96.01%] 28957352 [54.30%] 28929281 [54.25%]

66    GDR    (11/02/08 -> 17/03/08)

53888700 51715393 [95.97%] 49316064 [91.51%] 51771050 [96.07%] 29007782 [53.83%] 29120307 [54.04%]

65    GDR    (07/01/08 -> 11/02/08)

52306980 50225688 [96.02%] 47945030 [91.66%] 50274075 [96.11%] 33615757 [64.27%] 33377709 [63.81%]

64    GDR    (03/12/07 -> 07/01/08)

50754000 48728155 [96.01%] 46564252 [91.74%] 48766950 [96.08%] 46533235 [91.68%] 45111483 [88.88%]

63    GDR    (29/10/07 -> 03/12/07)

53451140 51261243 [95.90%] 49033362 [91.73%] 51290424 [95.96%] 48944340 [91.57%] 47323308 [88.54%]

62    GDR    (24/09/07 -> 29/10/07)

49605360 47533152 [95.82%] 45536633 [91.80%] 47548092 [95.85%] 45416354 [91.56%] 44082330 [88.87%]

61    GDR    (20/08/07 -> 24/09/07)

53344480 51119363 [95.83%] 48978369 [91.82%] 51126034 [95.84%] 48804101 [91.49%] 47443804 [88.94%]

60    GDR    (16/07/07 -> 20/08/07)

53389140 51139847 [95.79%] 49008075 [91.79%] 51141688 [95.79%] 48816762 [91.44%] 47324219 [88.64%]

59    GDR    (11/06/07 -> 16/07/07)

50041800 47961092 [95.84%] 45962750 [91.85%] 47962152 [95.84%] 45800791 [91.53%] 44485292 [88.90%]

58    GDR    (07/05/07 -> 11/06/07)

53373580 51216866 [95.96%] 48966153 [91.74%] 51244494 [96.01%] 48861221 [91.55%] 47522820 [89.04%]

57    GDR    (02/04/07 -> 07/05/07)

52480080 50368493 [95.98%] 48104963 [91.66%] 50413347 [96.06%] 48029156 [91.52%] 46679070 [88.95%]

56    GDR    (26/02/07 -> 02/04/07)

47344160 45470936 [96.04%] 43409389 [91.69%] 45520912 [96.15%] 43356684 [91.58%] 42109717 [88.94%]

55    GDR    (22/01/07 -> 26/02/07)

48284080 46403790 [96.11%] 44295795 [91.74%] 46446365 [96.19%] 44218022 [91.58%] 42953429 [88.96%]

54    GDR    (18/12/06 -> 22/01/07)

52333060 50268322 [96.05%] 48012961 [91.74%] 50306433 [96.13%] 47947889 [91.62%] 46618339 [89.08%]

53    GDR    (13/11/06 -> 18/12/06)

43794560 42034524 [95.98%] 40166705 [91.72%] 42059061 [96.04%] 40098698 [91.56%] 38931276 [88.90%]

52    GDR    (09/10/06 -> 13/11/06)

52554240 50377495 [95.86%] 48198131 [91.71%] 50395767 [95.89%] 48034175 [91.40%] 46414615 [88.32%]

51    GDR    (04/09/06 -> 09/10/06)

45670420 43760870 [95.82%] 41902475 [91.75%] 43770262 [95.84%] 41649549 [91.20%] 40352357 [88.36%]

50    GDR    (31/07/06 -> 04/09/06)

53381560 51130739 [95.78%] 48970735 [91.74%] 51135574 [95.79%] 48652916 [91.14%] 47123284 [88.28%]

49    GDR    (26/06/06 -> 31/07/06)

53591960 51320609 [95.76%] 49152572 [91.72%] 51325245 [95.77%] 48845325 [91.14%] 47516894 [88.66%]

48    GDR    (22/05/06 -> 26/06/06)

46555460 44692786 [96.00%] 42791387 [91.91%] 44704651 [96.02%] 35237059 [75.69%] 24994169 [53.69%]

47    GDR    (17/04/06 -> 22/05/06)

52797720 50692149 [96.01%] 48439294 [91.75%] 50734030 [96.09%] 47634305 [90.22%] 45490217 [86.16%]

46    GDR    (13/03/06 -> 17/04/06)

49514360 47532730 [96.00%] 45340413 [91.57%] 47581175 [96.10%] 45213164 [91.31%] 43919810 [88.70%]

45    GDR    (06/02/06 -> 13/03/06)

53274920 51178205 [96.06%] 48818413 [91.63%] 51226811 [96.16%] 48681652 [91.38%] 47325202 [88.83%]

44    GDR    (02/01/06 -> 06/02/06)

51999540 49930982 [96.02%] 47660271 [91.66%] 49971433 [96.10%] 47505344 [91.36%] 46253993 [88.95%]

43    GDR    (28/11/05 -> 02/01/06)

52272900 50149596 [95.94%] 47900764 [91.64%] 50184864 [96.01%] 47774804 [91.39%] 46409346 [88.78%]

42    GDR    (24/10/05 -> 28/11/05)

52830040 50650084 [95.87%] 48444057 [91.70%] 50676240 [95.92%] 48251196 [91.33%] 46664017 [88.33%]

41    GDR    (19/09/05 -> 24/10/05)

52973080 50755241 [95.81%] 48602548 [91.75%] 50769754 [95.84%] 48302430 [91.18%] 46827962 [88.40%]

40    GDR    (15/08/05 -> 19/09/05)

52276200 50070982 [95.78%] 47949872 [91.72%] 50077651 [95.79%] 47518756 [90.90%] 46139668 [88.26%]

39    GDR    (11/07/05 -> 15/08/05)

52081740 49879202 [95.77%] 47791239 [91.76%] 49882383 [95.78%] 47349062 [90.91%] 46035366 [88.39%]

38    GDR    (06/06/05 -> 11/07/05)

53185200 50959562 [95.82%] 48808998 [91.77%] 50961023 [95.82%] 48390764 [90.99%] 47161606 [88.67%]

37    GDR    (02/05/05 -> 06/06/05)

52122260 50007086 [95.94%] 47811159 [91.73%] 50036807 [96.00%] 47498248 [91.13%] 46210891 [88.66%]

36    GDR    (28/03/05 -> 02/05/05)

51840380 49733413 [95.94%] 47458126 [91.55%] 49787270 [96.04%] 47252537 [91.15%] 45904934 [88.55%]

35    GDR    (21/02/05 -> 28/03/05)

52978860 50877505 [96.03%] 48508837 [91.56%] 50932881 [96.14%] 48334375 [91.23%] 46968177 [88.65%]

34    GDR    (17/01/05 -> 21/02/05)

47537060 45664222 [96.06%] 43555199 [91.62%] 45707588 [96.15%] 43407352 [91.31%] 42244942 [88.87%]

33    GDR    (13/12/04 -> 17/01/05)

49522520 47535187 [95.99%] 45351752 [91.58%] 47573706 [96.06%] 45186792 [91.24%] 43909598 [88.67%]

32    GDR    (08/11/04 -> 13/12/04)

49765080 47611159 [95.67%] 45524509 [91.48%] 47652770 [95.76%] 45399921 [91.23%] 44031159 [88.48%]

31    GDR    (04/10/04 -> 08/11/04)

53061740 50864421 [95.86%] 48684527 [91.75%] 50885676 [95.90%] 48416958 [91.25%] 47044902 [88.66%]

30    GDR    (30/08/04 -> 04/10/04)

52008880 49803499 [95.76%] 47667310 [91.65%] 49813031 [95.78%] 47279819 [90.91%] 45980060 [88.41%]

29    GDR    (26/07/04 -> 30/08/04)

51882280 49654762 [95.71%] 47528296 [91.61%] 49658250 [95.71%] 47104467 [90.79%] 45866244 [88.40%]

28    GDR    (21/06/04 -> 26/07/04)

53389220 51127332 [95.76%] 48960664 [91.71%] 51128330 [95.77%] 48539815 [90.92%] 47337694 [88.67%]

27    GDR    (17/05/04 -> 21/06/04)

52157140 50011453 [95.89%] 47827338 [91.70%] 50031958 [95.93%] 47472087 [91.02%] 46251707 [88.68%]

26    GDR    (12/04/04 -> 17/05/04)

53041160 50881149 [95.93%] 48550986 [91.53%] 50928850 [96.02%] 48315506 [91.09%] 47021871 [88.65%]

25    GDR    (08/03/04 -> 12/04/04)

54043860 51860528 [95.96%] 49447262 [91.49%] 51914154 [96.06%] 49268220 [91.16%] 47898707 [88.63%]

24    GDR    (02/02/04 -> 08/03/04)

53466200 51345645 [96.03%] 48952337 [91.56%] 51393409 [96.12%] 48806285 [91.28%] 47422623 [88.70%]

23    GDR    (29/12/03 -> 02/02/04)

53483760 51342306 [96.00%] 48964652 [91.55%] 51386699 [96.08%] 48826599 [91.29%] 47421617 [88.67%]

22    GDR    (24/11/03 -> 29/12/03)

43351360 41592241 [95.94%] 39704018 [91.59%] 41621759 [96.01%] 39561885 [91.26%] 38411146 [88.60%]

21    GDR    (20/10/03 -> 24/11/03)

52101640 49921206 [95.82%] 47714402 [91.58%] 49945568 [95.86%] 47476181 [91.12%] 46077658 [88.44%]

20    GDR    (15/09/03 -> 20/10/03)

52849500 50671255 [95.88%] 48530712 [91.83%] 50669221 [95.87%] 48062886 [90.94%] 46714869 [88.39%]

19    GDR    (11/08/03 -> 15/09/03)

49857080 47749833 [95.77%] 45713062 [91.69%] 47751289 [95.78%] 45270386 [90.80%] 44090525 [88.43%]

18    GDR    (07/07/03 -> 11/08/03)

53094080 50828810 [95.73%] 48663568 [91.66%] 50824966 [95.73%] 48199343 [90.78%] 47015591 [88.55%]

17    GDR    (02/06/03 -> 07/07/03)

53250060 51027527 [95.83%] 48830513 [91.70%] 51029514 [95.83%] 48396552 [90.89%] 47192975 [88.63%]

16    GDR    (28/04/03 -> 02/06/03)

47372020 45424472 [95.89%] 43407327 [91.63%] 45454416 [95.95%] 43066955 [90.91%] 41941069 [88.54%]

15    GDR    (24/03/03 -> 28/04/03)

49885760 48020510 [96.26%] 46169501 [92.55%] 47990915 [96.20%] 45309486 [90.83%] 44185810 [88.57%]

14    GDR    (17/02/03 -> 24/03/03)

42810140 41083297 [95.97%] 39342946 [91.90%] 41094280 [95.99%] 38929790 [90.94%] 37956797 [88.66%]

13    GDR    (13/01/03 -> 17/02/03)

46847660 45029570 [96.12%] 42975184 [91.73%] 45066933 [96.20%] 42834005 [91.43%] 41693661 [89.00%]

12    GDR    (09/12/02 -> 13/01/03)

52918100 50794068 [95.99%] 48459807 [91.58%] 50831060 [96.06%] 48296136 [91.27%] 46925841 [88.68%]

11    GDR    (04/11/02 -> 09/12/02)

50288200 48171332 [95.79%] 46013317 [91.50%] 48196060 [95.84%] 45806056 [91.09%] 44551248 [88.59%]

10    GDR    (01/10/02 -> 04/11/02)

48980160 46804805 [95.56%] 44742671 [91.35%] 46817291 [95.58%] 44370026 [90.59%] 43235657 [88.27%]

09    GDR    (27/08/02 -> 30/09/02)

48550740 46293376 [95.35%] 44346440 [91.34%] 46313992 [95.39%] 43964477 [90.55%] 42934900 [88.43%]

08    GDR    (23/07/02 -> 26/08/02)

48801880 46084847 [94.43%] 44246345 [90.67%] 46109915 [94.48%] 43922732 [90.00%] 42907039 [87.92%]

07    GDR    (18/06/02 -> 22/07/02)

45710440 43187230 [94.48%] 41285259 [90.32%] 43138713 [94.37%] 40629372 [88.88%] 39748943 [86.96%]

06    GDR    (14/05/02 -> 17/06/02)

11871460 9162267 [77.18%] 8597495 [72.42%] 8960621 [75.48%] 8986939 [75.70%] 8356190 [70.39%]

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