Re: Interpolation- problem with the linint2 function

From: Lorenzo de Cillia <lorenzo.decillia_at_nyahnyahspammersnyahnyah>
Date: Tue Nov 26 2013 - 14:24:17 MST

Thanks, I already changed it to true, but I still have the error....

Lorenzo

2013/11/26 Adam Phillips <asphilli@ucar.edu>

> Hi Lorenzo,
> As you are now interpolating to a global grid, I think you want to set the
> linint2 cyclic option to True..
> Adam
>
>
> On 11/26/2013 11:33 AM, Lorenzo de Cillia wrote:
>
> Hi Adam,
>
> Thank you for your help...
> I changed the latitude to -90:90, but I still have the problem of missing
> values in the interpolated data...
> I added the input/output lon and lat down there, but I think they should
> be fine?
> Any idea what could cause my error?
>
> -------------------------------------------
>
> Variable: mlon
> Type: double
> Total Size: 1152 bytes
> 144 values
> Number of Dimensions: 1
> Dimensions and sizes: [lon | 144]
> Coordinates:
> Number Of Attributes: 5
> axis : X
> standard_name : longitude
> bounds : lon_bnds
> units : degrees_east
> long_name : longitude
> (0) 1.25
> (1) 3.75
> (2) 6.25
> (3) 8.75
> (4) 11.25
> (5) 13.75
> (6) 16.25
> (7) 18.75
> (8) 21.25
> (9) 23.75
> (10) 26.25
> (11) 28.75
> (12) 31.25
> (13) 33.75
> (14) 36.25
> (15) 38.75
> (16) 41.25
> (17) 43.75
> (18) 46.25
> (19) 48.75
> (20) 51.25
> (21) 53.75
> (22) 56.25
> (23) 58.75
> (24) 61.25000000000001
> (25) 63.75000000000001
> (26) 66.25
> (27) 68.75
> (28) 71.25
> (29) 73.75
> (30) 76.25
> (31) 78.75
> (32) 81.25
> (33) 83.75
> (34) 86.25
> (35) 88.75
> (36) 91.25
> (37) 93.75
> (38) 96.25
> (39) 98.75
> (40) 101.25
> (41) 103.75
> (42) 106.25
> (43) 108.75
> (44) 111.25
> (45) 113.75
> (46) 116.25
> (47) 118.75
> (48) 121.25
> (49) 123.75
> (50) 126.25
> (51) 128.75
> (52) 131.25
> (53) 133.75
> (54) 136.25
> (55) 138.75
> (56) 141.25
> (57) 143.75
> (58) 146.25
> (59) 148.75
> (60) 151.25
> (61) 153.75
> (62) 156.25
> (63) 158.75
> (64) 161.25
> (65) 163.75
> (66) 166.25
> (67) 168.75
> (68) 171.25
> (69) 173.75
> (70) 176.25
> (71) 178.75
> (72) 181.25
> (73) 183.75
> (74) 186.25
> (75) 188.75
> (76) 191.25
> (77) 193.75
> (78) 196.25
> (79) 198.75
> (80) 201.25
> (81) 203.75
> (82) 206.25
> (83) 208.75
> (84) 211.25
> (85) 213.75
> (86) 216.25
> (87) 218.75
> (88) 221.25
> (89) 223.75
> (90) 226.25
> (91) 228.75
> (92) 231.25
> (93) 233.75
> (94) 236.25
> (95) 238.75
> (96) 241.25
> (97) 243.75
> (98) 246.25
> (99) 248.75
> (100) 251.25
> (101) 253.75
> (102) 256.25
> (103) 258.75
> (104) 261.25
> (105) 263.75
> (106) 266.2500000000001
> (107) 268.75
> (108) 271.25
> (109) 273.75
> (110) 276.25
> (111) 278.75
> (112) 281.25
> (113) 283.75
> (114) 286.25
> (115) 288.75
> (116) 291.25
> (117) 293.75
> (118) 296.25
> (119) 298.75
> (120) 301.25
> (121) 303.75
> (122) 306.25
> (123) 308.75
> (124) 311.25
> (125) 313.75
> (126) 316.25
> (127) 318.75
> (128) 321.25
> (129) 323.75
> (130) 326.25
> (131) 328.75
> (132) 331.25
> (133) 333.75
> (134) 336.25
> (135) 338.75
> (136) 341.25
> (137) 343.75
> (138) 346.25
> (139) 348.75
> (140) 351.25
> (141) 353.7500000000001
> (142) 356.25
> (143) 358.75
>
> Variable: mlat
> Type: double
> Total Size: 720 bytes
> 90 values
> Number of Dimensions: 1
> Dimensions and sizes: [lat | 90]
> Coordinates:
> Number Of Attributes: 5
> axis : Y
> standard_name : latitude
> bounds : lat_bnds
> units : degrees_north
> long_name : latitude
> (0) -89
> (1) -87
> (2) -85
> (3) -83
> (4) -81
> (5) -79
> (6) -77
> (7) -75
> (8) -73
> (9) -71
> (10) -69
> (11) -67
> (12) -65
> (13) -63
> (14) -61
> (15) -59.00000000000001
> (16) -57.00000000000001
> (17) -55
> (18) -53
> (19) -51
> (20) -49
> (21) -47
> (22) -45
> (23) -43
> (24) -41
> (25) -39
> (26) -37
> (27) -35
> (28) -33
> (29) -31
> (30) -29
> (31) -27
> (32) -25
> (33) -23
> (34) -21
> (35) -19
> (36) -17
> (37) -15
> (38) -13
> (39) -11
> (40) -9
> (41) -7
> (42) -5
> (43) -3
> (44) -1
> (45) 1
> (46) 3
> (47) 5
> (48) 7
> (49) 9
> (50) 11
> (51) 13
> (52) 15
> (53) 17
> (54) 19
> (55) 21
> (56) 23
> (57) 25
> (58) 27
> (59) 29
> (60) 31
> (61) 33
> (62) 35
> (63) 37
> (64) 39
> (65) 41
> (66) 43
> (67) 45
> (68) 47
> (69) 49
> (70) 51
> (71) 53
> (72) 55
> (73) 57.00000000000001
> (74) 59.00000000000001
> (75) 61
> (76) 63
> (77) 65
> (78) 67
> (79) 69
> (80) 71
> (81) 73
> (82) 75
> (83) 77
> (84) 79
> (85) 81
> (86) 83
> (87) 85
> (88) 87
> (89) 89
>
> Variable: klon
> Type: float
> Total Size: 576 bytes
> 144 values
> Number of Dimensions: 1
> Dimensions and sizes: [144]
> Coordinates:
> (0) 0
> (1) 2.5
> (2) 5
> (3) 7.5
> (4) 10
> (5) 12.5
> (6) 15
> (7) 17.5
> (8) 20
> (9) 22.5
> (10) 25
> (11) 27.5
> (12) 30
> (13) 32.5
> (14) 35
> (15) 37.5
> (16) 40
> (17) 42.5
> (18) 45
> (19) 47.5
> (20) 50
> (21) 52.5
> (22) 55
> (23) 57.5
> (24) 60
> (25) 62.5
> (26) 65
> (27) 67.5
> (28) 70
> (29) 72.5
> (30) 75
> (31) 77.5
> (32) 80
> (33) 82.5
> (34) 85
> (35) 87.5
> (36) 90
> (37) 92.5
> (38) 95
> (39) 97.5
> (40) 100
> (41) 102.5
> (42) 105
> (43) 107.5
> (44) 110
> (45) 112.5
> (46) 115
> (47) 117.5
> (48) 120
> (49) 122.5
> (50) 125
> (51) 127.5
> (52) 130
> (53) 132.5
> (54) 135
> (55) 137.5
> (56) 140
> (57) 142.5
> (58) 145
> (59) 147.5
> (60) 150
> (61) 152.5
> (62) 155
> (63) 157.5
> (64) 160
> (65) 162.5
> (66) 165
> (67) 167.5
> (68) 170
> (69) 172.5
> (70) 175
> (71) 177.5
> (72) 180
> (73) 182.5
> (74) 185
> (75) 187.5
> (76) 190
> (77) 192.5
> (78) 195
> (79) 197.5
> (80) 200
> (81) 202.5
> (82) 205
> (83) 207.5
> (84) 210
> (85) 212.5
> (86) 215
> (87) 217.5
> (88) 220
> (89) 222.5
> (90) 225
> (91) 227.5
> (92) 230
> (93) 232.5
> (94) 235
> (95) 237.5
> (96) 240
> (97) 242.5
> (98) 245
> (99) 247.5
> (100) 250
> (101) 252.5
> (102) 255
> (103) 257.5
> (104) 260
> (105) 262.5
> (106) 265
> (107) 267.5
> (108) 270
> (109) 272.5
> (110) 275
> (111) 277.5
> (112) 280
> (113) 282.5
> (114) 285
> (115) 287.5
> (116) 290
> (117) 292.5
> (118) 295
> (119) 297.5
> (120) 300
> (121) 302.5
> (122) 305
> (123) 307.5
> (124) 310
> (125) 312.5
> (126) 315
> (127) 317.5
> (128) 320
> (129) 322.5
> (130) 325
> (131) 327.5
> (132) 330
> (133) 332.5
> (134) 335
> (135) 337.5
> (136) 340
> (137) 342.5
> (138) 345
> (139) 347.5
> (140) 350
> (141) 352.5
> (142) 355
> (143) 357.5
>
>
> Variable: klat
> Type: float
> Total Size: 292 bytes
> 73 values
> Number of Dimensions: 1
> Dimensions and sizes: [73]
> Coordinates:
> (0) -90
> (1) -87.5
> (2) -85
> (3) -82.5
> (4) -80
> (5) -77.5
> (6) -75
> (7) -72.5
> (8) -70
> (9) -67.5
> (10) -65
> (11) -62.5
> (12) -60
> (13) -57.5
> (14) -55
> (15) -52.5
> (16) -50
> (17) -47.5
> (18) -45
> (19) -42.5
> (20) -40
> (21) -37.5
> (22) -35
> (23) -32.5
> (24) -30
> (25) -27.5
> (26) -25
> (27) -22.5
> (28) -20
> (29) -17.5
> (30) -15
> (31) -12.5
> (32) -10
> (33) -7.5
> (34) -5
> (35) -2.5
> (36) 0
> (37) 2.5
> (38) 5
> (39) 7.5
> (40) 10
> (41) 12.5
> (42) 15
> (43) 17.5
> (44) 20
> (45) 22.5
> (46) 25
> (47) 27.5
> (48) 30
> (49) 32.5
> (50) 35
> (51) 37.5
> (52) 40
> (53) 42.5
> (54) 45
> (55) 47.5
> (56) 50
> (57) 52.5
> (58) 55
> (59) 57.5
> (60) 60
> (61) 62.5
> (62) 65
> (63) 67.5
> (64) 70
> (65) 72.5
> (66) 75
> (67) 77.5
> (68) 80
> (69) 82.5
> (70) 85
> (71) 87.5
> (72) 90
>
>
>
>
>
>
>
> 2013/11/26 Adam Phillips <asphilli@ucar.edu>
>
>> Hi Lorenzo,
>> Whenever linint2/linint2_Wrap are used one has to check to make sure that
>> the input and output grids are overlapping and are oriented the same
>> direction. So if you are having trouble with those functions I would take a
>> close look at your input/output latitudes/longitudes. I cannot see what
>> your input latitudes and longitudes are, but they should match your output
>> latitudes/longitudes which run from south->north (lat) and from 0->357.5E.
>>
>> However, I see that you are setting you output latitudes like this:
>> klat = ispan(0,72,1)*2.5
>> That results in a latitude array from 0->180, which is outside the range
>> of -90:90. So I am guessing that that line is causing your problem.
>>
>> If you have any further questions please respond to ncl-talk..
>> Adam
>>
>> On 11/26/2013 10:36 AM, Lorenzo de Cillia wrote:
>>
>> Hello!
>>
>> I have a problem with the following NCL script....
>> I'm reading out geopotential height data from a .nc file and try to
>> interpolate it to a 2.5x2.5 grid with the function linint2...
>>
>> The problem is that I got a lot of missing values (so 1e+20) in the
>> results and I don't know why... Can please somebody tell me if there's an
>> error in the script or in the usage of the linint2 function?
>>
>> Thank you for your help,
>>
>> Lorenzo
>>
>> ------------------------------
>> -------------
>>
>> begin
>> filen=getenv("FILENAME")
>>
>> ;; print (filen)
>> a = addfile(filen,"r")
>>
>> u1 = a->zg(:,3,:,:)
>>
>> ;;;output
>> u1@_FillValue=1e+20
>> npts = dimsizes(u1(:,0,0)) ; number of time points
>> nlat = dimsizes(u1(0,:,0)) ; number of latitudes
>> nlon = dimsizes(u1(0,0,:)) ; number of lon
>>
>> um=new ( (/nlat,nlon /), float)
>> filo = "daily_model.dat" ; output file
>>
>> ;;interpolate to 2.5x2.5
>>
>> mlon = u1&lon
>> mlat = u1&lat
>> print(mlat)
>>
>> klon = ispan(0,143,1)*2.5
>> print(klon)
>> klat = ispan(0,72,1)*2.5
>> print(klat)
>>
>> ;print(u1)
>> model =linint2(mlon,mlat,u1,False,klon,klat,0)
>> printVarSummary(model)
>> print(model)
>> fbinrecwrite (filo, -1, model)
>> end
>>
>>
>>
>> _______________________________________________
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>>
>>
>> --
>> ______________________________________________________________
>> Adam Phillips asphilli@ucar.edu
>> NCAR/Climate and Global Dynamics Division (303) 497-1726
>> P.O. Box 3000
>> Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli
>>
>>
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>> ncl-talk mailing list
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>>
>>
>
>
> _______________________________________________
> ncl-talk mailing list
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>
>
> --
> ______________________________________________________________
> Adam Phillips asphilli@ucar.edu
> NCAR/Climate and Global Dynamics Division (303) 497-1726
> P.O. Box 3000
> Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli
>
>

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Received on Tue Nov 26 14:24:28 2013

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