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Environmental Modeling Center

 
 

Changes in MMAB global sea ice land file

The new (2001) sea ice land mask file changes the flags for 1160 points of the 259200 globally. Almost all of the changes (1145) are to change flags from land to coastal. 11 points change from being flagged as land to being ocean. And 4 change from ocean to land. The location and nature of the changes are given below.

Land and ocean should pretty much match your expectations. "coast" refers to points which are possibly unreliable due to there being enough land nearby that a broad beam satellite (as SSMI, whose footprint ranges from 12 to 70 km depending on orientaion of the footprint and which frequency is used) may be unable to get a clear view of the ocean. These are 'use at your own risk' points. Any conclusion you draw which depends crucially on data from these points should be viewed with caution.

Robert.Grumbine@noaa.gov
Last Modified 12 April 2001
Return to land mask page
Return to main sea ice page


'old' is the operational 'newland' file in use up through 12 April 2001
'new' is the recomputed and suitable for climate 'newland' file:
Globally-integrated areas for old and new masks, in millions of km^2:
old area of land 146.608289
new area of land 145.166808

old area of coast 10.653926
new area of coast 12.092550

old area of ocean 352.643759
new area of ocean 352.646611


Points which are currently land, but which will be relabelled ocean:
157 0 81.750 338.750
157 0 81.250 268.750
157 0 79.250 100.250
157 0 79.250 100.750
157 0 78.250 19.750
157 0 77.750 341.250
157 0 75.250 254.750
157 0 70.750 305.250
157 0 69.750 169.750
157 0 61.750 163.750
157 0 -66.250 293.750

Points which are currently ocean and will be relabelled land:
0 157 60.250 19.250
0 157 45.750 141.750
0 157 -64.750 135.250
0 157 -69.750 9.750

Points which are currently land but which will be relabelled as coast:
157 195 83.250 320.750
157 195 83.250 334.250
157 195 83.250 334.750
157 195 82.750 294.250
157 195 82.750 294.750
157 195 82.750 312.750
157 195 82.750 313.250
157 195 82.750 336.750
157 195 82.750 337.250
157 195 82.250 276.250
157 195 82.250 276.750
157 195 82.250 304.250
157 195 82.250 306.250
157 195 82.250 306.750
157 195 82.250 307.250
157 195 82.250 307.750
157 195 82.250 308.250
157 195 82.250 308.750
157 195 82.250 311.750
157 195 82.250 312.250
157 195 82.250 312.750
157 195 82.250 313.250
157 195 82.250 331.750
157 195 82.250 332.250
157 195 82.250 335.750
157 195 82.250 336.250
157 195 82.250 336.750
157 195 82.250 337.250
157 195 81.750 268.250
157 195 81.750 268.750
157 195 81.750 269.250
157 195 81.750 335.250
157 195 81.750 338.250
157 195 81.750 339.250
157 195 81.750 339.750
157 195 81.750 340.750
157 195 81.750 341.250
157 195 81.750 341.750
157 195 81.750 342.250
157 195 81.750 342.750
157 195 81.750 346.250
157 195 81.750 346.750
157 195 81.750 347.250
157 195 81.250 266.750
157 195 81.250 267.250
157 195 81.250 267.750
157 195 81.250 268.250
157 195 81.250 269.250
157 195 81.250 294.250
157 195 81.250 298.250
157 195 81.250 298.750
157 195 81.250 338.250
157 195 80.750 47.250
157 195 80.750 47.750
157 195 80.750 49.250
157 195 80.750 49.750
157 195 80.750 55.250
157 195 80.750 57.250
157 195 80.750 57.750
157 195 80.750 58.250
157 195 80.750 58.750
157 195 80.750 59.750
157 195 80.750 63.250
157 195 80.750 63.750
157 195 80.750 64.250
157 195 80.750 92.750
157 195 80.750 269.250
157 195 80.750 271.250
157 195 80.750 271.750
157 195 80.250 18.750
157 195 80.250 20.750
157 195 80.250 21.250
157 195 80.250 21.750
157 195 80.250 22.250
157 195 80.250 23.750
157 195 80.250 24.250
157 195 80.250 58.750
157 195 80.250 59.250
157 195 80.250 59.750
157 195 80.250 60.250
157 195 80.250 91.750
157 195 80.250 272.750
157 195 80.250 273.250
157 195 80.250 273.750
157 195 80.250 274.750
157 195 80.250 275.250
157 195 80.250 275.750
157 195 80.250 276.250
157 195 80.250 276.750
157 195 80.250 277.250
157 195 80.250 277.750
157 195 80.250 343.250
157 195 79.750 11.750
157 195 79.750 12.250
157 195 79.750 12.750
157 195 79.750 13.250
157 195 79.750 13.750
157 195 79.750 14.250
157 195 79.750 14.750
157 195 79.750 17.750
157 195 79.750 19.250
157 195 79.750 263.750
157 195 79.750 340.750
157 195 79.750 341.250
157 195 79.250 19.250
157 195 79.250 19.750
157 195 79.250 20.250
157 195 79.250 23.750
157 195 79.250 24.250
157 195 79.250 101.250
157 195 79.250 101.750
157 195 79.250 254.750
157 195 79.250 255.250
157 195 79.250 255.750
157 195 79.250 265.750
157 195 79.250 266.250
157 195 79.250 274.750
157 195 79.250 275.250
157 195 78.750 11.250
157 195 78.750 100.250
157 195 78.750 259.250
157 195 78.750 259.750
157 195 78.750 262.250
157 195 78.750 273.750
157 195 78.750 274.250
157 195 78.750 290.250
157 195 78.750 339.250
157 195 78.750 339.750
157 195 78.250 19.250
157 195 78.250 20.250
157 195 78.250 22.750
157 195 78.250 101.750
157 195 78.250 102.250
157 195 78.250 247.750
157 195 78.250 248.250
157 195 78.250 248.750
157 195 78.250 250.250
157 195 78.250 257.250
157 195 78.250 257.750
157 195 78.250 258.250
157 195 78.250 258.750
157 195 78.250 268.250
157 195 78.250 270.250
157 195 78.250 271.750
157 195 78.250 272.250
157 195 77.750 23.750
157 195 77.750 246.750
157 195 77.750 250.250
157 195 77.750 273.250
157 195 77.750 273.750
157 195 77.750 274.250
157 195 77.750 282.250
157 195 77.750 289.250
157 195 77.750 340.250
157 195 77.750 340.750
157 195 77.250 241.750
157 195 77.250 242.250
157 195 77.250 289.250
157 195 77.250 289.750
157 195 77.250 290.250
157 195 77.250 290.750
157 195 77.250 292.750
157 195 77.250 340.750
157 195 77.250 341.250
157 195 76.750 17.250
157 195 76.750 65.750
157 195 76.750 66.250
157 195 76.750 107.250
157 195 76.750 107.750
157 195 76.750 108.250
157 195 76.750 239.250
157 195 76.750 259.250
157 195 76.750 263.250
157 195 76.750 289.750
157 195 76.750 290.250
157 195 76.750 290.750
157 195 76.750 340.250
157 195 76.750 340.750
157 195 76.250 61.250
157 195 76.250 61.750
157 195 76.250 62.750
157 195 76.250 63.250
157 195 76.250 63.750
157 195 76.250 64.250
157 195 76.250 67.750
157 195 76.250 112.750
157 195 76.250 113.250
157 195 76.250 241.250
157 195 76.250 241.750
157 195 76.250 242.250
157 195 76.250 243.250
157 195 76.250 243.750
157 195 76.250 246.250
157 195 76.250 246.750
157 195 76.250 257.250
157 195 76.250 257.750
157 195 76.250 264.750
157 195 76.250 265.250
157 195 76.250 265.750
157 195 76.250 266.750
157 195 76.250 270.250
157 195 76.250 270.750
157 195 76.250 279.750
157 195 76.250 280.250
157 195 76.250 280.750
157 195 76.250 297.750
157 195 76.250 298.250
157 195 76.250 340.250
157 195 75.750 58.750
157 195 75.750 64.250
157 195 75.750 64.750
157 195 75.750 91.250
157 195 75.750 91.750
157 195 75.750 92.250
157 195 75.750 99.750
157 195 75.750 140.250
157 195 75.750 140.750
157 195 75.750 142.750
157 195 75.750 143.250
157 195 75.750 143.750
157 195 75.750 144.250
157 195 75.750 241.250
157 195 75.750 242.250
157 195 75.750 242.750
157 195 75.750 250.250
157 195 75.750 250.750
157 195 75.750 300.750
157 195 75.250 56.750
157 195 75.250 61.250
157 195 75.250 148.750
157 195 75.250 242.750
157 195 75.250 254.250
157 195 75.250 255.250
157 195 75.250 262.750
157 195 75.250 263.250
157 195 75.250 340.750
157 195 75.250 341.250
157 195 75.250 342.250
157 195 74.750 55.750
157 195 74.750 86.250
157 195 74.750 100.250
157 195 74.750 148.250
157 195 74.750 245.750
157 195 74.750 246.250
157 195 74.750 268.250
157 195 74.750 340.250
157 195 74.250 55.250
157 195 74.250 111.750
157 195 74.250 113.250
157 195 74.250 140.250
157 195 74.250 140.750
157 195 74.250 235.250
157 195 74.250 235.750
157 195 74.250 239.750
157 195 74.250 240.750
157 195 74.250 241.750
157 195 73.750 85.750
157 195 73.750 86.250
157 195 73.750 109.750
157 195 73.750 123.750
157 195 73.750 124.250
157 195 73.750 142.750
157 195 73.750 244.250
157 195 73.750 273.250
157 195 73.750 273.750
157 195 73.750 277.750
157 195 73.750 278.250
157 195 73.750 278.750
157 195 73.750 279.250
157 195 73.750 279.750
157 195 73.750 303.750
157 195 73.250 71.250
157 195 73.250 108.750
157 195 73.250 142.750
157 195 73.250 235.250
157 195 73.250 252.250
157 195 73.250 252.750
157 195 73.250 262.250
157 195 73.250 262.750
157 195 73.250 274.250
157 195 73.250 274.750
157 195 73.250 275.250
157 195 73.250 283.250
157 195 72.750 52.750
157 195 72.750 69.250
157 195 72.750 72.250
157 195 72.750 129.250
157 195 72.750 141.250
157 195 72.750 141.750
157 195 72.750 241.250
157 195 72.750 241.750
157 195 72.750 246.250
157 195 72.750 248.250
157 195 72.750 249.250
157 195 72.750 258.750
157 195 72.750 259.250
157 195 72.750 279.750
157 195 72.750 283.750
157 195 72.250 52.250
157 195 72.250 75.750
157 195 72.250 76.750
157 195 72.250 77.250
157 195 72.250 79.250
157 195 72.250 80.250
157 195 72.250 80.750
157 195 72.250 81.250
157 195 72.250 81.750
157 195 72.250 139.250
157 195 72.250 146.250
157 195 72.250 146.750
157 195 72.250 147.750
157 195 72.250 148.750
157 195 72.250 251.750
157 195 72.250 274.250
157 195 72.250 279.750
157 195 72.250 304.250
157 195 72.250 336.750
157 195 72.250 337.250
157 195 71.750 68.250
157 195 71.750 75.750
157 195 71.750 77.750
157 195 71.750 81.250
157 195 71.750 132.250
157 195 71.750 139.750
157 195 71.750 235.750
157 195 71.750 252.250
157 195 71.750 255.750
157 195 71.750 264.250
157 195 71.750 274.250
157 195 71.750 286.250
157 195 71.750 304.250
157 195 71.750 337.750
157 195 71.250 67.250
157 195 71.250 72.250
157 195 71.250 73.250
157 195 71.250 75.750
157 195 71.250 76.250
157 195 71.250 76.750
157 195 71.250 82.750
157 195 71.250 134.250
157 195 71.250 151.250
157 195 71.250 151.750
157 195 71.250 179.250
157 195 71.250 203.750
157 195 71.250 263.750
157 195 71.250 267.250
157 195 71.250 270.750
157 195 71.250 271.250
157 195 71.250 271.750
157 195 71.250 288.750
157 195 71.250 305.750
157 195 71.250 306.250
157 195 71.250 306.750
157 195 71.250 334.750
157 195 71.250 335.250
157 195 70.750 23.250
157 195 70.750 23.750
157 195 70.750 25.750
157 195 70.750 26.250
157 195 70.750 26.750
157 195 70.750 29.250
157 195 70.750 29.750
157 195 70.750 57.250
157 195 70.750 83.250
157 195 70.750 131.250
157 195 70.750 152.750
157 195 70.750 153.750
157 195 70.750 200.250
157 195 70.750 200.750
157 195 70.750 201.250
157 195 70.750 201.750
157 195 70.750 205.750
157 195 70.750 206.250
157 195 70.750 207.250
157 195 70.750 256.250
157 195 70.750 263.250
157 195 70.750 270.750
157 195 70.750 289.750
157 195 70.750 290.250
157 195 70.750 290.750
157 195 70.750 306.250
157 195 70.750 306.750
157 195 70.750 307.750
157 195 70.750 308.250
157 195 70.250 21.750
157 195 70.250 30.750
157 195 70.250 83.250
157 195 70.250 197.750
157 195 70.250 232.750
157 195 70.250 245.250
157 195 70.250 245.750
157 195 70.250 246.250
157 195 70.250 246.750
157 195 70.250 247.250
157 195 70.250 258.750
157 195 70.250 281.750
157 195 70.250 291.750
157 195 70.250 305.750
157 195 70.250 333.750
157 195 70.250 334.250
157 195 69.750 18.250
157 195 69.750 30.250
157 195 69.750 30.750
157 195 69.750 31.250
157 195 69.750 31.750
157 195 69.750 32.750
157 195 69.750 60.750
157 195 69.750 61.250
157 195 69.750 163.750
157 195 69.750 169.250
157 195 69.750 170.250
157 195 69.750 175.250
157 195 69.750 225.750
157 195 69.750 230.750
157 195 69.750 234.750
157 195 69.750 237.750
157 195 69.750 262.250
157 195 69.750 267.750
157 195 69.750 268.250
157 195 69.750 276.750
157 195 69.750 277.250
157 195 69.750 277.750
157 195 69.750 278.250
157 195 69.750 278.750
157 195 69.750 279.250
157 195 69.750 279.750
157 195 69.750 280.750
157 195 69.750 281.250
157 195 69.750 282.250
157 195 69.750 282.750
157 195 69.750 308.250
157 195 69.250 16.750
157 195 69.250 33.750
157 195 69.250 34.250
157 195 69.250 34.750
157 195 69.250 65.250
157 195 69.250 76.250
157 195 69.250 168.750
157 195 69.250 179.250
157 195 69.250 196.750
157 195 69.250 221.250
157 195 69.250 221.750
157 195 69.250 236.250
157 195 69.250 240.250
157 195 69.250 253.250
157 195 69.250 258.250
157 195 69.250 264.250
157 195 69.250 278.250
157 195 69.250 282.750
157 195 69.250 283.250
157 195 69.250 283.750
157 195 69.250 335.250
157 195 68.750 27.750
157 195 68.750 37.250
157 195 68.750 53.250
157 195 68.750 57.750
157 195 68.750 59.250
157 195 68.750 60.750
157 195 68.750 75.250
157 195 68.750 180.750
157 195 68.750 194.250
157 195 68.750 194.750
157 195 68.750 245.250
157 195 68.750 246.250
157 195 68.750 250.750
157 195 68.750 251.750
157 195 68.750 252.250
157 195 68.750 252.750
157 195 68.750 254.250
157 195 68.750 261.750
157 195 68.750 266.250
157 195 68.750 270.250
157 195 68.750 283.750
157 195 68.750 284.250
157 195 68.750 284.750
157 195 68.750 292.250
157 195 68.750 307.750
157 195 68.750 308.750
157 195 68.250 14.750
157 195 68.250 15.250
157 195 68.250 38.750
157 195 68.250 51.250
157 195 68.250 54.250
157 195 68.250 54.750
157 195 68.250 68.250
157 195 68.250 77.750
157 195 68.250 255.750
157 195 68.250 263.750
157 195 68.250 283.250
157 195 68.250 283.750
157 195 68.250 284.250
157 195 68.250 285.250
157 195 68.250 285.750
157 195 68.250 286.250
157 195 68.250 286.750
157 195 68.250 330.250
157 195 68.250 330.750
157 195 67.750 45.750
157 195 67.750 49.250
157 195 67.750 245.750
157 195 67.750 246.250
157 195 67.750 247.750
157 195 67.750 248.750
157 195 67.750 250.250
157 195 67.750 257.250
157 195 67.750 258.750
157 195 67.750 259.250
157 195 67.750 260.750
157 195 67.750 262.250
157 195 67.750 264.250
157 195 67.750 273.250
157 195 67.750 282.750
157 195 67.750 285.750
157 195 67.750 286.250
157 195 67.750 286.750
157 195 67.750 287.250
157 195 67.750 327.250
157 195 67.250 14.250
157 195 67.250 45.250
157 195 67.250 72.250
157 195 67.250 196.250
157 195 67.250 264.250
157 195 67.250 272.750
157 195 67.250 278.750
157 195 67.250 296.750
157 195 66.750 33.750
157 195 66.750 46.250
157 195 66.750 46.750
157 195 66.750 73.250
157 195 66.750 185.750
157 195 66.750 197.750
157 195 66.750 240.250
157 195 66.750 288.750
157 195 66.250 34.250
157 195 66.250 37.250
157 195 66.250 43.750
157 195 66.250 71.250
157 195 66.250 71.750
157 195 66.250 72.250
157 195 66.250 194.250
157 195 66.250 198.250
157 195 66.250 236.250
157 195 66.250 236.750
157 195 66.250 237.250
157 195 66.250 275.250
157 195 66.250 276.250
157 195 66.250 276.750
157 195 66.250 289.250
157 195 66.250 289.750
157 195 66.250 290.250
157 195 66.250 292.750
157 195 66.250 298.250
157 195 66.250 324.750
157 195 66.250 343.250
157 195 66.250 344.750
157 195 65.750 24.250
157 195 65.750 237.750
157 195 65.750 241.750
157 195 65.750 270.750
157 195 65.750 273.750
157 195 65.750 274.250
157 195 65.750 275.750
157 195 65.750 276.250
157 195 65.750 297.750
157 195 65.750 338.750
157 195 65.250 21.750
157 195 65.250 25.250
157 195 65.250 239.750
157 195 65.250 271.250
157 195 65.250 295.250
157 195 65.250 320.250
157 195 64.750 36.750
157 195 64.750 38.250
157 195 64.750 38.750
157 195 64.750 40.250
157 195 64.750 176.750
157 195 64.750 177.750
157 195 64.750 184.750
157 195 64.750 185.250
157 195 64.750 198.750
157 195 64.750 277.250
157 195 64.750 277.750
157 195 64.750 281.750
157 195 64.750 294.250
157 195 64.750 337.250
157 195 64.250 21.250
157 195 64.250 35.750
157 195 64.250 177.750
157 195 64.250 264.750
157 195 63.750 37.250
157 195 63.750 178.750
157 195 63.750 277.750
157 195 63.250 21.750
157 195 63.250 190.750
157 195 63.250 195.750
157 195 63.250 241.750
157 195 63.250 242.250
157 195 63.250 288.250
157 195 63.250 291.750
157 195 62.750 21.250
157 195 62.750 27.250
157 195 62.750 164.250
157 195 62.750 258.250
157 195 62.750 262.250
157 195 62.750 295.250
157 195 62.750 317.750
157 195 62.250 26.250
157 195 62.250 175.750
157 195 62.250 248.750
157 195 62.250 276.250
157 195 62.250 276.750
157 195 62.250 284.250
157 195 62.250 286.750
157 195 62.250 291.750
157 195 62.250 353.250
157 195 61.750 28.250
157 195 61.750 29.250
157 195 61.750 157.250
157 195 61.750 157.750
157 195 61.750 160.250
157 195 61.750 163.250
157 195 61.750 174.250
157 195 61.750 247.250
157 195 61.750 287.750
157 195 61.750 288.250
157 195 61.750 294.250
157 195 61.750 294.750
157 195 61.250 28.250
157 195 61.250 35.750
157 195 61.250 36.250
157 195 61.250 156.750
157 195 61.250 172.750
157 195 61.250 209.250
157 195 61.250 209.750
157 195 61.250 246.250
157 195 61.250 311.250
157 195 60.750 160.250
157 195 60.750 163.250
157 195 60.750 208.250
157 195 60.750 208.750
157 195 60.750 212.250
157 195 60.750 244.250
157 195 60.750 244.750
157 195 60.750 281.750
157 195 60.750 313.750
157 195 60.250 18.750
157 195 60.250 37.750
157 195 60.250 165.750
157 195 60.250 166.250
157 195 60.250 193.250
157 195 60.250 193.750
157 195 60.250 215.250
157 195 60.250 257.750
157 195 60.250 295.750
157 195 59.750 28.750
157 195 59.750 219.250
157 195 59.750 220.250
157 195 59.250 5.250
157 195 59.250 5.750
157 195 59.250 10.750
157 195 59.250 142.750
157 195 59.250 208.250
157 195 59.250 221.250
157 195 59.250 250.250
157 195 59.250 251.250
157 195 58.750 13.750
157 195 58.750 27.750
157 195 58.750 37.750
157 195 58.750 38.250
157 195 58.750 201.250
157 195 58.750 249.250
157 195 58.750 249.750
157 195 58.750 265.750
157 195 58.750 293.750
157 195 58.250 38.750
157 195 58.250 158.750
157 195 58.250 207.750
157 195 58.250 223.250
157 195 58.250 256.750
157 195 58.250 292.750
157 195 57.750 11.750
157 195 57.750 16.750
157 195 57.750 140.250
157 195 57.750 157.250
157 195 57.750 162.250
157 195 57.750 223.750
157 195 57.750 353.250
157 195 57.750 354.250
157 195 57.750 356.250
157 195 57.750 356.750
157 195 57.250 201.750
157 195 57.250 207.250
157 195 57.250 257.250
157 195 56.750 156.250
157 195 56.750 163.250
157 195 56.750 205.750
157 195 56.750 225.750
157 195 56.250 10.750
157 195 56.250 16.250
157 195 56.250 199.750
157 195 56.250 225.750
157 195 56.250 272.250
157 195 56.250 280.250
157 195 56.250 298.750
157 195 56.250 353.750
157 195 56.250 354.250
157 195 56.250 357.250
157 195 55.750 8.250
157 195 55.750 10.250
157 195 55.750 11.250
157 195 55.750 12.750
157 195 55.750 109.750
157 195 55.750 198.250
157 195 55.750 226.250
157 195 55.750 228.750
157 195 55.750 354.250
157 195 55.250 11.250
157 195 55.250 12.250
157 195 55.250 199.750
157 195 55.250 275.250
157 195 55.250 275.750
157 195 55.250 352.750
157 195 55.250 353.750
157 195 55.250 355.250
157 195 54.750 11.250
157 195 54.750 18.250
157 195 54.750 227.750
157 195 54.750 229.250
157 195 54.750 301.750
157 195 54.750 302.250
157 195 54.750 351.250
157 195 54.750 354.250
157 195 54.750 355.750
157 195 54.750 356.250
157 195 54.750 358.750
157 195 54.250 10.750
157 195 54.250 13.750
157 195 54.250 16.250
157 195 54.250 19.250
157 195 54.250 142.750
157 195 54.250 350.250
157 195 54.250 351.250
157 195 53.750 137.750
157 195 53.750 138.250
157 195 53.750 280.750
157 195 53.750 300.250
157 195 53.750 300.750
157 195 53.750 303.250
157 195 53.250 0.250
157 195 53.250 5.250
157 195 53.250 108.750
157 195 53.250 141.250
157 195 53.250 159.750
157 195 53.250 191.750
157 195 53.250 259.750
157 195 53.250 355.750
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