[ncl-talk] select sub_region

Karin Meier-Fleischer meier-fleischer at dkrz.de
Thu Dec 16 06:40:45 MST 2021


1. The longitudes of tauuo_ssp are in range -180. to 180. degrees which 
means that you have to flip them to the range 0 to 359 degrees.

   longitude (degrees_east) : min=-180 max=180      (=> 361 elements)

2. And the longitude array has one element too much (first element == 
last element) that's why you have to skip the last element.

3. If you want to keep the variable name tauuo_ssp don't forget to use 
the reassignment operator := when extracting a sub-region.


   diri = "./"
   fname = "tauuo_ssp.nc"

   f = addfile(diri+fname, "r")

   tauuo_ssp = f->tauuo_ssp(:,0:359)
tauuo_ssp = lonFlip(tauuo_ssp)
tauuo_ssp := tauuo_ssp({10:75},{120:240})

   wks = gsn_open_wks("pdf", "plot_tauuo")

   res = True
   res at gsnAddCyclic = False
   res at mpCenterLonF = 180.
   res at cnFillOn = True

   plot = gsn_csm_contour_map(wks, tauuo_ssp, res)



Am 16.12.21 um 13:21 schrieb Chathurika:
>
> Dear Karin,
>
>
> Thank you so much for your kind answer. Actually It is my fault that I 
> have not updated the script after creating the one time nc file to 
> send you. The data that I used has the variable nametauuo. I created 
> the one time file (variable name was tauuo_ssp instead of 
> tauuo),unfortunately forgot to update the information in the script 
> before sent it to you. I did not get any error while running the 
> script. For some reason it just does not select the right region. You 
> too can check it. Even though you give the latitude and longitude 
> values associated with the Pacific Ocean, You won't get the defined 
> region. That's the only problem I have.
>
>
> Anyway thanks for your valuable time and kind response.
>
>
> Best regards,
>
> Chathu
>
>
>
>     -----Original Messages-----
>     *From:*"Karin Meier-Fleischer" <meier-fleischer at dkrz.de>
>     *Sent Time:*2021-12-16 19:51:40 (Thursday)
>     *To:* Chathurika <chatu at scsio.ac.cn>
>     *Cc:* "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
>     *Subject:* Re: [ncl-talk] select sub_region
>
>     Running your script causes the following error which tells you
>     exactly what is going wrong.
>
>     ncl NCL_Talk.ncl
>      Copyright (C) 1995-2019 - All Rights Reserved
>      University Corporation for Atmospheric Research
>      NCAR Command Language Version 6.6.2
>      The use of this software is governed by a License Agreement.
>      See http://www.ncl.ucar.edu/ for more details.
>     fatal:["Execute.c":133]:variable *(tauuo)* is not in file
>     (./tauuo_ssp.nc)
>     fatal:["Execute.c":6378]:variable *(tauuo)* is not in file (f)
>     fatal:["Execute.c":8637]:Execute: *Error occurred at or near line
>     9 in file NCL_Talk.ncl*
>
>     fatal:Variable (tauuo_ssp) is undefined
>     fatal:["Execute.c":8637]:Execute: Error occurred at or near line
>     10 in file NCL_Talk.ncl
>
>     fatal:Variable (tauuo_ssp) is undefined
>     fatal:["Execute.c":8637]:Execute: Error occurred at or near line
>     11 in file NCL_Talk.ncl
>
>
>     The variable you try to read has the name tauuo_ssp and not tauuo!
>     And NCL is so kind to tell you at which line you have to look first.
>     Change the variable name from tauuo to tauuo_ssp and it works fine.
>
>     If you do not know the contents of a netCDF file you should have a
>     look at it with the command line programs /*ncl_filedump*/ or
>     /*ncdump*/.
>
>
>     Am 15.12.21 um 13:43 schrieb Chathurika:
>>
>>     Dear Karin,
>>
>>
>>     Thank you very much for your reply. Please find the attached
>>     script and data file (one time step). I want to select the
>>     pacific ocean (120E-120W).
>>
>>
>>     Thanks again and best regards,
>>
>>     Chathu
>>
>>
>>         -----Original Messages-----
>>         *From:*"Karin Meier-Fleischer" <meier-fleischer at dkrz.de>
>>         *Sent Time:*2021-12-15 19:00:13 (Wednesday)
>>         *To:* Chathurika <chatu at scsio.ac.cn>
>>         *Cc:* "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
>>         *Subject:* Re: [ncl-talk] select sub_region
>>
>>         Hi Chatchurika,
>>
>>         it is very hard to say what is going wrong without the data
>>         and only the information 'It does not select the Pacifik
>>         Ocean'. Can you send one timestep of your data and best would
>>         be to provide your NCL script.
>>
>>         -Karin
>>
>>         Am 14.12.21 um 18:17 schrieb Chathurika:
>>>
>>>         Dear Karin,
>>>
>>>
>>>         Many many thanks for your email. I am sorry It is a typo. I
>>>         actually did try this
>>>
>>>>         = f->tauuo(:,{10:75},{-120:120}) and vice versa.
>>>>         = f->tauuo(:,{10:75},300:60}) and vice versa.
>>>>
>>>         However, It does not select the Pacific Ocean.
>>>
>>>         Summary of longitude is;
>>>
>>>
>>>
>>>         Variable: lon (coordinate)
>>>
>>>         Type: double
>>>
>>>         Total Size: 2888 bytes
>>>
>>>         361 values
>>>
>>>         Number of Dimensions: 1
>>>
>>>         Dimensions and sizes: [lon | 361]
>>>
>>>         Coordinates:
>>>
>>>         Number Of Attributes: 4
>>>
>>>         standard_name : longitude
>>>
>>>         long_name : longitude
>>>
>>>         units : degrees_east
>>>
>>>         axis : X
>>>
>>>         (0) -180
>>>
>>>         (1) -179
>>>
>>>         (2) -178
>>>
>>>         (3) -177
>>>
>>>         (4) -176
>>>
>>>         (5) -175
>>>
>>>         (6) -174
>>>
>>>         (7) -173
>>>
>>>         (8) -172
>>>
>>>         (9) -171
>>>
>>>         (10) -170
>>>
>>>         (11) -169
>>>
>>>         (12) -168
>>>
>>>         (13) -167
>>>
>>>         (14) -166
>>>
>>>         (15) -165
>>>
>>>         (16) -164
>>>
>>>         (17) -163
>>>
>>>         (18) -162
>>>
>>>         (19) -161
>>>
>>>         (20) -160
>>>
>>>         (21) -159
>>>
>>>         (22) -158
>>>
>>>         (23) -157
>>>
>>>         (24) -156
>>>
>>>         (25) -155
>>>
>>>         (26) -154
>>>
>>>         (27) -153
>>>
>>>         (28) -152
>>>
>>>         (29) -151
>>>
>>>         (30) -150
>>>
>>>         (31) -149
>>>
>>>         (32) -148
>>>
>>>         (33) -147
>>>
>>>         (34) -146
>>>
>>>         (35) -145
>>>
>>>         (36) -144
>>>
>>>         (37) -143
>>>
>>>         (38) -142
>>>
>>>         (39) -141
>>>
>>>         (40) -140
>>>
>>>         (41) -139
>>>
>>>         (42) -138
>>>
>>>         (43) -137
>>>
>>>         (44) -136
>>>
>>>         (45) -135
>>>
>>>         (46) -134
>>>
>>>         (47) -133
>>>
>>>         (48) -132
>>>
>>>         (49) -131
>>>
>>>         (50) -130
>>>
>>>         (51) -129
>>>
>>>         (52) -128
>>>
>>>         (53) -127
>>>
>>>         (54) -126
>>>
>>>         (55) -125
>>>
>>>         (56) -124
>>>
>>>         (57) -123
>>>
>>>         (58) -122
>>>
>>>         (59) -121
>>>
>>>         (60) -120
>>>
>>>         (61) -119
>>>
>>>         (62) -118
>>>
>>>         (63) -117
>>>
>>>         (64) -116
>>>
>>>         (65) -115
>>>
>>>         (66) -114
>>>
>>>         (67) -113
>>>
>>>         (68) -112
>>>
>>>         (69) -111
>>>
>>>         (70) -110
>>>
>>>         (71) -109
>>>
>>>         (72) -108
>>>
>>>         (73) -107
>>>
>>>         (74) -106
>>>
>>>         (75) -105
>>>
>>>         (76) -104
>>>
>>>         (77) -103
>>>
>>>         (78) -102
>>>
>>>         (79) -101
>>>
>>>         (80) -100
>>>
>>>         (81) -99
>>>
>>>         (82) -98
>>>
>>>         (83) -97
>>>
>>>         (84) -96
>>>
>>>         (85) -95
>>>
>>>         (86) -94
>>>
>>>         (87) -93
>>>
>>>         (88) -92
>>>
>>>         (89) -91
>>>
>>>         (90) -90
>>>
>>>         (91) -89
>>>
>>>         (92) -88
>>>
>>>         (93) -87
>>>
>>>         (94) -86
>>>
>>>         (95) -85
>>>
>>>         (96) -84
>>>
>>>         (97) -83
>>>
>>>         (98) -82
>>>
>>>         (99) -81
>>>
>>>         (100) -80
>>>
>>>         (101) -79
>>>
>>>         (102) -78
>>>
>>>         (103) -77
>>>
>>>         (104) -76
>>>
>>>         (105) -75
>>>
>>>         (106) -74
>>>
>>>         (107) -73
>>>
>>>         (108) -72
>>>
>>>         (109) -71
>>>
>>>         (110) -70
>>>
>>>         (111) -69
>>>
>>>         (112) -68
>>>
>>>         (113) -67
>>>
>>>         (114) -66
>>>
>>>         (115) -65
>>>
>>>         (116) -64
>>>
>>>         (117) -63
>>>
>>>         (118) -62
>>>
>>>         (119) -61
>>>
>>>         (120) -60
>>>
>>>         (121) -59
>>>
>>>         (122) -58
>>>
>>>         (123) -57
>>>
>>>         (124) -56
>>>
>>>         (125) -55
>>>
>>>         (126) -54
>>>
>>>         (127) -53
>>>
>>>         (128) -52
>>>
>>>         (129) -51
>>>
>>>         (130) -50
>>>
>>>         (131) -49
>>>
>>>         (132) -48
>>>
>>>         (133) -47
>>>
>>>         (134) -46
>>>
>>>         (135) -45
>>>
>>>         (136) -44
>>>
>>>         (137) -43
>>>
>>>         (138) -42
>>>
>>>         (139) -41
>>>
>>>         (140) -40
>>>
>>>         (141) -39
>>>
>>>         (142) -38
>>>
>>>         (143) -37
>>>
>>>         (144) -36
>>>
>>>         (145) -35
>>>
>>>         (146) -34
>>>
>>>         (147) -33
>>>
>>>         (148) -32
>>>
>>>         (149) -31
>>>
>>>         (150) -30
>>>
>>>         (151) -29
>>>
>>>         (152) -28
>>>
>>>         (153) -27
>>>
>>>         (154) -26
>>>
>>>         (155) -25
>>>
>>>         (156) -24
>>>
>>>         (157) -23
>>>
>>>         (158) -22
>>>
>>>         (159) -21
>>>
>>>         (160) -20
>>>
>>>         (161) -19
>>>
>>>         (162) -18
>>>
>>>         (163) -17
>>>
>>>         (164) -16
>>>
>>>         (165) -15
>>>
>>>         (166) -14
>>>
>>>         (167) -13
>>>
>>>         (168) -12
>>>
>>>         (169) -11
>>>
>>>         (170) -10
>>>
>>>         (171) -9
>>>
>>>         (172) -8
>>>
>>>         (173) -7
>>>
>>>         (174) -6
>>>
>>>         (175) -5
>>>
>>>         (176) -4
>>>
>>>         (177) -3
>>>
>>>         (178) -2
>>>
>>>         (179) -1
>>>
>>>         (180) 0
>>>
>>>         (181) 1
>>>
>>>         (182) 2
>>>
>>>         (183) 3
>>>
>>>         (184) 4
>>>
>>>         (185) 5
>>>
>>>         (186) 6
>>>
>>>         (187) 7
>>>
>>>         (188) 8
>>>
>>>         (189) 9
>>>
>>>         (190) 10
>>>
>>>         (191) 11
>>>
>>>         (192) 12
>>>
>>>         (193) 13
>>>
>>>         (194) 14
>>>
>>>         (195) 15
>>>
>>>         (196) 16
>>>
>>>         (197) 17
>>>
>>>         (198) 18
>>>
>>>         (199) 19
>>>
>>>         (200) 20
>>>
>>>         (201) 21
>>>
>>>         (202) 22
>>>
>>>         (203) 23
>>>
>>>         (204) 24
>>>
>>>         (205) 25
>>>
>>>         (206) 26
>>>
>>>         (207) 27
>>>
>>>         (208) 28
>>>
>>>         (209) 29
>>>
>>>         (210) 30
>>>
>>>         (211) 31
>>>
>>>         (212) 32
>>>
>>>         (213) 33
>>>
>>>         (214) 34
>>>
>>>         (215) 35
>>>
>>>         (216) 36
>>>
>>>         (217) 37
>>>
>>>         (218) 38
>>>
>>>         (219) 39
>>>
>>>         (220) 40
>>>
>>>         (221) 41
>>>
>>>         (222) 42
>>>
>>>         (223) 43
>>>
>>>         (224) 44
>>>
>>>         (225) 45
>>>
>>>         (226) 46
>>>
>>>         (227) 47
>>>
>>>         (228) 48
>>>
>>>         (229) 49
>>>
>>>         (230) 50
>>>
>>>         (231) 51
>>>
>>>         (232) 52
>>>
>>>         (233) 53
>>>
>>>         (234) 54
>>>
>>>         (235) 55
>>>
>>>         (236) 56
>>>
>>>         (237) 57
>>>
>>>         (238) 58
>>>
>>>         (239) 59
>>>
>>>         (240) 60
>>>
>>>         (241) 61
>>>
>>>         (242) 62
>>>
>>>         (243) 63
>>>
>>>         (244) 64
>>>
>>>         (245) 65
>>>
>>>         (246) 66
>>>
>>>         (247) 67
>>>
>>>         (248) 68
>>>
>>>         (249) 69
>>>
>>>         (250) 70
>>>
>>>         (251) 71
>>>
>>>         (252) 72
>>>
>>>         (253) 73
>>>
>>>         (254) 74
>>>
>>>         (255) 75
>>>
>>>         (256) 76
>>>
>>>         (257) 77
>>>
>>>         (258) 78
>>>
>>>         (259) 79
>>>
>>>         (260) 80
>>>
>>>         (261) 81
>>>
>>>         (262) 82
>>>
>>>         (263) 83
>>>
>>>         (264) 84
>>>
>>>         (265) 85
>>>
>>>         (266) 86
>>>
>>>         (267) 87
>>>
>>>         (268) 88
>>>
>>>         (269) 89
>>>
>>>         (270) 90
>>>
>>>         (271) 91
>>>
>>>         (272) 92
>>>
>>>         (273) 93
>>>
>>>         (274) 94
>>>
>>>         (275) 95
>>>
>>>         (276) 96
>>>
>>>         (277) 97
>>>
>>>         (278) 98
>>>
>>>         (279) 99
>>>
>>>         (280) 100
>>>
>>>         (281) 101
>>>
>>>         (282) 102
>>>
>>>         (283) 103
>>>
>>>         (284) 104
>>>
>>>         (285) 105
>>>
>>>         (286) 106
>>>
>>>         (287) 107
>>>
>>>         (288) 108
>>>
>>>         (289) 109
>>>
>>>         (290) 110
>>>
>>>         (291) 111
>>>
>>>         (292) 112
>>>
>>>         (293) 113
>>>
>>>         (294) 114
>>>
>>>         (295) 115
>>>
>>>         (296) 116
>>>
>>>         (297) 117
>>>
>>>         (298) 118
>>>
>>>         (299) 119
>>>
>>>         (300) 120
>>>
>>>         (301) 121
>>>
>>>         (302) 122
>>>
>>>         (303) 123
>>>
>>>         (304) 124
>>>
>>>         (305) 125
>>>
>>>         (306) 126
>>>
>>>         (307) 127
>>>
>>>         (308) 128
>>>
>>>         (309) 129
>>>
>>>         (310) 130
>>>
>>>         (311) 131
>>>
>>>         (312) 132
>>>
>>>         (313) 133
>>>
>>>         (314) 134
>>>
>>>         (315) 135
>>>
>>>         (316) 136
>>>
>>>         (317) 137
>>>
>>>         (318) 138
>>>
>>>         (319) 139
>>>
>>>         (320) 140
>>>
>>>         (321) 141
>>>
>>>         (322) 142
>>>
>>>         (323) 143
>>>
>>>         (324) 144
>>>
>>>         (325) 145
>>>
>>>         (326) 146
>>>
>>>         (327) 147
>>>
>>>         (328) 148
>>>
>>>         (329) 149
>>>
>>>         (330) 150
>>>
>>>         (331) 151
>>>
>>>         (332) 152
>>>
>>>         (333) 153
>>>
>>>         (334) 154
>>>
>>>         (335) 155
>>>
>>>         (336) 156
>>>
>>>         (337) 157
>>>
>>>         (338) 158
>>>
>>>         (339) 159
>>>
>>>         (340) 160
>>>
>>>         (341) 161
>>>
>>>         (342) 162
>>>
>>>         (343) 163
>>>
>>>         (344) 164
>>>
>>>         (345) 165
>>>
>>>         (346) 166
>>>
>>>         (347) 167
>>>
>>>         (348) 168
>>>
>>>         (349) 169
>>>
>>>         (350) 170
>>>
>>>         (351) 171
>>>
>>>         (352) 172
>>>
>>>         (353) 173
>>>
>>>         (354) 174
>>>
>>>         (355) 175
>>>
>>>         (356) 176
>>>
>>>         (357) 177
>>>
>>>         (358) 178
>>>
>>>         (359) 179
>>>
>>>         (360) 180
>>>
>>>
>>>         It always select the middle part instead of Pacific.
>>>
>>>
>>>         Thank you very very much and best regards,
>>>
>>>         Chathu
>>>
>>>             -----Original Messages-----
>>>             *From:*"Karin Meier-Fleischer via ncl-talk"
>>>             <ncl-talk at mailman.ucar.edu>
>>>             *Sent Time:*2021-12-14 20:33:47 (Tuesday)
>>>             *To:* ncl-talk at mailman.ucar.edu
>>>             *Cc:*
>>>             *Subject:* Re: [ncl-talk] select sub_region
>>>
>>>             Hi Chatchu,
>>>
>>>             you should have received an error message because you
>>>             try to extract data from a 4D variable tauuo which seems
>>>             to be a 3D variable (with a different name tauuo_ssp ??).
>>>
>>>             Variable: tauuo_ssp
>>>             ...
>>>             Dimensions and sizes: [time | 720] x [lat | 66] x [lon |
>>>             360]
>>>             Coordinates:
>>>                    time: [569784..744360]
>>>                    lat: [  10..  75]
>>>                    lon: [ 180..-180]
>>>
>>>             Try
>>>
>>>                variable = f->tauuo_ssp(:,:,{-120.:120.})
>>>
>>>             -Karin
>>>
>>>
>>>             Am 14.12.21 um 13:12 schrieb Chathurika via ncl-talk:
>>>>
>>>>             Hello Everyone,
>>>>
>>>>
>>>>             I have a dataset and the variable summary as follows;
>>>>
>>>>
>>>>             Variable: tauuo_ssp
>>>>             Type: float
>>>>             Total Size: 45809280 bytes
>>>>                  11452320 values
>>>>             Number of Dimensions: 3
>>>>             Dimensions and sizes: [time | 720] x [lat | 66] x [lon
>>>>             | 360]
>>>>             Coordinates:
>>>>                  time: [569784..744360]
>>>>                  lat: [  10..  75]
>>>>                  lon: [ 180..-180]
>>>>             Number Of Attributes: 7
>>>>             depth :   0
>>>>             standard_name : surface_downward_x_stress
>>>>             long_name : Surface downward x stress
>>>>             units : N m-2
>>>>             code : 548
>>>>             _FillValue : -9e+33
>>>>             missing_value : -9e+33
>>>>
>>>>             I want to select the pacific ocean (-120:120). However,
>>>>             this does not work. I tried out several ways to choose
>>>>             this subsection, but I always got the part that I
>>>>             wanted to subtract between -120:120 (means Atlantic
>>>>             plus the Indian Ocean instead of Pacific Ocean).
>>>>
>>>>
>>>>             I tried this
>>>>
>>>>
>>>>             = f->tauuo(:,0,{10:75},{-120:120}) and vice versa.
>>>>             = f->tauuo(:,0,{10:75},300:60}) and vice versa.
>>>>
>>>>             Nothing selected the Pacific Ocean from 120E to 120W.
>>>>
>>>>
>>>>             Could you please give me a hint on how I could do this?
>>>>             That would be a great help.
>>>>
>>>>
>>>>             Thank you very very much and best regards,
>>>>             Chathu
>>>>
>>>>             ------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>>
>>>>                 //
>>>>                 //
>>>>                 //
>>>>                 //
>>>>
>>>>
>>>>             _______________________________________________
>>>>             ncl-talk mailing listncl-talk at mailman.ucar.edu  List instructions, subscriber options, unsubscribe:https://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>>
>>>
>>>
>>>         ------------------------------------------------------------------------
>>>
>>>
>>>
>>>             Wickramage Chathurika Hemamali
>>>             Msc in Physical Oceanography
>>>             State Key Laboratory of Tropical Oceanography
>>>             South China Sea Institute of Oceanology
>>>             University of Chinese Academy of Science
>>>             China
>>>
>>>             /Specialized in Oceanography and Marine Geology (Bachelor)/
>>>             /University of Ruhuna/
>>>             /Matara/
>>>             /Sri Lanka/
>>>
>>>             Email : wickramagechathurika at rocketmail.com
>>>             chatu at scsio.ac.cn
>>>
>>
>>
>>
>>
>>     ------------------------------------------------------------------------
>>
>>
>>
>>         Wickramage Chathurika Hemamali
>>         Msc in Physical Oceanography
>>         State Key Laboratory of Tropical Oceanography
>>         South China Sea Institute of Oceanology
>>         University of Chinese Academy of Science
>>         China
>>
>>         /Specialized in Oceanography and Marine Geology (Bachelor)/
>>         /University of Ruhuna/
>>         /Matara/
>>         /Sri Lanka/
>>
>>         Email : wickramagechathurika at rocketmail.com
>>         chatu at scsio.ac.cn
>>
>
>     -- 
>     Dipl. Geophys. Karin Meier-Fleischer
>     Visualization Group - NCL, CDO, Python
>     Application Support
>
>     Deutsches Klimarechenzentrum GmbH (DKRZ)
>     Bundesstrasse 45a - D-20146 Hamburg - Germany
>
>     Phone:    +49 (0)40 460094 126
>     Fax:      +49 (0)40 460094 270
>     E-Mail:meier-fleischer at dkrz.de  URL:www.dkrz.de  Geschäftsführer: Prof. Dr. Thomas Ludwig
>     Sitz der Gesellschaft: Hamburg
>     Amtsgericht Hamburg HRB 39784
>
>
>
>
> ------------------------------------------------------------------------
>
>
>
>     Wickramage Chathurika Hemamali
>     Msc in Physical Oceanography
>     State Key Laboratory of Tropical Oceanography
>     South China Sea Institute of Oceanology
>     University of Chinese Academy of Science
>     China
>
>     /Specialized in Oceanography and Marine Geology (Bachelor)/
>     /University of Ruhuna/
>     /Matara/
>     /Sri Lanka/
>
>     Email : wickramagechathurika at rocketmail.com
>     chatu at scsio.ac.cn
>

-- 
Dipl. Geophys. Karin Meier-Fleischer
Visualization Group - NCL, CDO, Python
Application Support

Deutsches Klimarechenzentrum GmbH (DKRZ)
Bundesstrasse 45a - D-20146 Hamburg - Germany

Phone:    +49 (0)40 460094 126
Fax:      +49 (0)40 460094 270
E-Mail:meier-fleischer at dkrz.de
URL:www.dkrz.de

Geschäftsführer: Prof. Dr. Thomas Ludwig
Sitz der Gesellschaft: Hamburg
Amtsgericht Hamburg HRB 39784
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