reproduce griddescription / remapping issue
Added by Andreas Hilboll over 12 years ago
Hi,
I have an issue reproducing a grid definition "by hand". My situation is as follows:
I have a dataset of CTM output. An example file can be found at http://www.iup.uni-bremen.de/~hilboll/_cdogrid-original.nc.
Using my own Python scripts, I do some calculations with the data (calculate vertical densities from concentration profiles) and write the output again to a NC file. An example can be found at http://www.iup.uni-bremen.de/~hilboll/_cdogrid-reproduced.nc. I'm using python-netcdf4 for this, but this should be irrelevant. I'm trying to reproduce the header information as closely as possible:
$ ncdump -h /home/doas/hilboll/public_html/_cdogrid-original.nc
netcdf _cdogrid-original {
dimensions:
lon = 52 ;
lat = 38 ;
rlat = 38 ;
lev = 16 ;
time = UNLIMITED ; // (24 currently)
variables:
float lon(lon) ;
lon:long_name = "longitude in rotated pole grid" ;
lon:units = "degrees_east" ;
lon:standard_name = "grid_longitude" ;
lon:axis = "X" ;
float lat(lat) ;
lat:long_name = "latitude in rotated pole grid" ;
lat:units = "degrees_north" ;
lat:standard_name = "grid_latitude" ;
lat:axis = "Y" ;
char rotated_pole ;
rotated_pole:grid_mapping_name = "rotated_latitude_longitude" ;
rotated_pole:grid_north_pole_latitude = 46.5 ;
rotated_pole:grid_north_pole_longitude = 12.5 ;
float rlat(rlat) ;
rlat:long_name = "latitude in rotated pole grid" ;
rlat:units = "degrees_north" ;
rlat:standard_name = "grid_latitude" ;
rlat:axis = "Y" ;
double lev(lev) ;
lev:long_name = "hybrid sigma level index" ;
lev:units = "level" ;
lev:axis = "Z" ;
double time(time) ;
time:units = "hours since 2000-08-08 00:00:00" ;
time:calendar = "standard" ;
float glon(time, lat, lon) ;
glon:long_name = "longitude" ;
glon:standard_name = "longitude" ;
glon:units = "degrees_east" ;
glon:grid_mapping = "rotated_pole" ;
float glat(time, lat, lon) ;
glat:long_name = "latitude" ;
glat:standard_name = "latitude" ;
glat:units = "degrees_north" ;
glat:grid_mapping = "rotated_pole" ;
float phig(time, lat, lon) ;
phig:long_name = "geopotential of the surface" ;
phig:standard_name = "geopotential_of_the_surface" ;
phig:units = "m2/s2" ;
phig:grid_mapping = "rotated_pole" ;
float fmask(time, lat, lon) ;
fmask:long_name = "land/sea mask" ;
fmask:standard_name = "land_sea_mask" ;
fmask:grid_mapping = "rotated_pole" ;
fmask:units = 1 ;
float level_height(time, lev, lat, lon) ;
level_height:long_name = "model level height" ;
level_height:standard_name = "model_level_height" ;
level_height:units = "m" ;
level_height:grid_mapping = "rotated_pole" ;
float level_thickness(time, lev, lat, lon) ;
level_thickness:long_name = "model level thickness" ;
level_thickness:standard_name = "model_level_thickness" ;
level_thickness:units = "m" ;
level_thickness:grid_mapping = "rotated_pole" ;
float NO2(time, lev, rlat, lon) ;
NO2:grid_mapping = "rotated_pole" ;
// global attributes:
:CDI = "Climate Data Interface version 1.4.7 (http://code.zmaw.de/projects/cdi)" ;
:Conventions = "CF-1.0" ;
:history = "Sat Aug 20 14:37:56 2011: cdo merge qaz.nc zaq.nc zot.nc NO2-20000808.nc\n",
"Sat Aug 20 14:37:55 2011: cdo expr,NO2=NO2*46.0 bolchem-saprc90soa-out-20000808.nc zot.nc\n",
"Sat Aug 13 18:21:37 2011: ncatted -a grid_north_pole_latitude,rotated_pole,o,d,43.50 2000080800/out/bolchem-saprc90soa-out-20000808.nc\n",
"Sat Aug 13 18:20:37 2011: ncatted -a grid_north_pole_longitude,rotated_pole,o,d,-167.5 2000080800/out/bolchem-saprc90soa-out-20000808.nc" ;
:CDO = "Climate Data Operators version 1.4.7 (http://code.zmaw.de/projects/cdo)" ;
}
and
$ ncdump -h /home/doas/hilboll/public_html/_cdogrid-reproduced.nc
netcdf _cdogrid-reproduced {
dimensions:
lon = 52 ;
lat = 38 ;
rlat = 38 ;
time = UNLIMITED ; // (31 currently)
variables:
float lon(lon) ;
lon:long_name = "longitude in rotated pole grid" ;
lon:units = "degrees_east" ;
lon:standard_name = "grid_longitude" ;
lon:axis = "X" ;
float lat(lat) ;
lat:long_name = "latitude in rotated pole grid" ;
lat:units = "degrees_north" ;
lat:standard_name = "grid_latitude" ;
lat:axis = "Y" ;
char rotated_pole ;
rotated_pole:grid_mapping_name = "rotated_latitude_longitude" ;
rotated_pole:grid_north_pole_latitude = 46.5 ;
rotated_pole:grid_north_pole_longitude = 12.5 ;
float rlat(rlat) ;
rlat:long_name = "latitude in rotated pole grid" ;
rlat:units = "degrees_north" ;
rlat:standard_name = "grid_latitude" ;
rlat:axis = "Y" ;
double time(time) ;
time:units = "hours since 1994-01-01 00:00:00" ;
time:calendar = "standard" ;
float glon(time, lat, lon) ;
glon:long_name = "longitude" ;
glon:standard_name = "longitude" ;
glon:units = "degrees_east" ;
glon:grid_mapping = "rotated_pole" ;
float glat(time, lat, lon) ;
glat:long_name = "latitude" ;
glat:standard_name = "latitude" ;
glat:units = "degrees_north" ;
glat:grid_mapping = "rotated_pole" ;
float NO2_tropospheric_column(time, rlat, lon) ;
NO2_tropospheric_column:units = "molecules / cm^2" ;
NO2_tropospheric_column:long_name = "Vertical tropospheric column NO2 (from surface to top of model)" ;
NO2_tropospheric_column:label = "VC_trop NO2 [molec/cm^2]" ;
// global attributes:
:description = "Vertical NO2 columns from Bolchem model." ;
:Conventions = "CF-1.4" ;
:title = "Vertical NO2 columns from Bolchem model." ;
:institution = "Institute of Environmental Physics, University of Bremen, Germany." ;
:source = "model" ;
:comment = "Model version Bolchem v1.\r\n",
"Model run performed by Alberto Maurizi <a.maurizi@isac.cnr.it>" ;
:contact = "Andreas Hilboll <hilboll@iup.physik.uni-bremen.de>" ;
}
However, the grid descriptions do not match:
$ cdo griddes /home/doas/hilboll/public_html/_cdogrid-original.nc # # gridID 2 # gridtype = lonlat gridsize = 1976 xname = lon xlongname = longitude in rotated pole grid xunits = degrees_east yname = lat ylongname = latitude in rotated pole grid yunits = degrees_north xsize = 52 ysize = 38 xnpole = 12.5 ynpole = 46.5 xfirst = -4.001 xinc = 0.1 yfirst = -3.284 yinc = 0.0999999 # # gridID 3 # gridtype = lonlat gridsize = 1976 xname = lon xlongname = longitude in rotated pole grid xunits = degrees_east yname = rlat ylongname = latitude in rotated pole grid yunits = degrees_north xsize = 52 ysize = 38 xnpole = 12.5 ynpole = 46.5 xfirst = -4.001 xinc = 0.1 yfirst = -3.284 yinc = 0.0999999 cdo griddes: Processed 7 variables ( 0.01s )
$ cdo griddes /home/doas/hilboll/public_html/_cdogrid-reproduced.nc # # gridID 25 # gridtype = lonlat gridsize = 1976 xname = lon xlongname = longitude in rotated pole grid xunits = degrees_east yname = lat ylongname = latitude in rotated pole grid yunits = degrees_north xsize = 52 ysize = 38 xnpole = 12.5 ynpole = 46.5 xfirst = -4.001 xinc = 0.1 yfirst = -3.284 yinc = 0.0999999 # # gridID 26 # gridtype = lonlat gridsize = 1976 xname = lon xlongname = longitude in rotated pole grid xunits = degrees_east yname = rlat ylongname = latitude in rotated pole grid yunits = degrees_north xsize = 52 ysize = 38 xfirst = -4.001 xinc = 0.1 yfirst = -3.284 yinc = 0.0999999 cdo griddes: Processed 3 variables ( 0.00s )
I'm at a loss here. The problem is that in a next step, i want to use remapcon2, and currently, this produces nan-filled files from my data:
$ cat IUP/data/bolchem/griddef_povalley.txt
gridtype = lonlat
xsize = 336
ysize = 64
xfirst = 6.03125
xinc = 0.0625
yfirst = 43.03125
yinc = 0.0625
$ cdo remapcon2,IUP/data/bolchem/griddef_povalley.txt /home/doas/hilboll/public_html/_cdogrid-reproduced.nc /home/doas/hilboll/public_html/_cdogrid-remapped.nc cdo remapcon2: Processed 183768 values from 3 variables over 31 timesteps ( 0.24s )
$ cdo info /home/doas/hilboll/public_html/_cdogrid-remapped.nc
-1 : Date Time Level Gridsize Miss : Minimum Mean Maximum : Parameter ID
1 : 2001-01-01 00:00:00 0 21504 21504 : nan : -1
2 : 2001-01-01 00:00:00 0 21504 21504 : nan : -2
3 : 2001-01-01 00:00:00 0 21504 21504 : nan : -3
4 : 2001-01-02 00:00:00 0 21504 21504 : nan : -1
5 : 2001-01-02 00:00:00 0 21504 21504 : nan : -2
6 : 2001-01-02 00:00:00 0 21504 21504 : nan : -3
7 : 2001-01-03 00:00:00 0 21504 21504 : nan : -1
8 : 2001-01-03 00:00:00 0 21504 21504 : nan : -2
9 : 2001-01-03 00:00:00 0 21504 21504 : nan : -3
10 : 2001-01-04 00:00:00 0 21504 21504 : nan : -1
11 : 2001-01-04 00:00:00 0 21504 21504 : nan : -2
12 : 2001-01-04 00:00:00 0 21504 21504 : nan : -3
13 : 2001-01-05 00:00:00 0 21504 21504 : nan : -1
14 : 2001-01-05 00:00:00 0 21504 21504 : nan : -2
15 : 2001-01-05 00:00:00 0 21504 21504 : nan : -3
16 : 2001-01-06 00:00:00 0 21504 21504 : nan : -1
17 : 2001-01-06 00:00:00 0 21504 21504 : nan : -2
18 : 2001-01-06 00:00:00 0 21504 21504 : nan : -3
19 : 2001-01-07 00:00:00 0 21504 21504 : nan : -1
20 : 2001-01-07 00:00:00 0 21504 21504 : nan : -2
21 : 2001-01-07 00:00:00 0 21504 21504 : nan : -3
22 : 2001-01-08 00:00:00 0 21504 21504 : nan : -1
23 : 2001-01-08 00:00:00 0 21504 21504 : nan : -2
24 : 2001-01-08 00:00:00 0 21504 21504 : nan : -3
25 : 2001-01-09 00:00:00 0 21504 21504 : nan : -1
26 : 2001-01-09 00:00:00 0 21504 21504 : nan : -2
27 : 2001-01-09 00:00:00 0 21504 21504 : nan : -3
28 : 2001-01-10 00:00:00 0 21504 21504 : nan : -1
29 : 2001-01-10 00:00:00 0 21504 21504 : nan : -2
30 : 2001-01-10 00:00:00 0 21504 21504 : nan : -3
31 : 2001-01-11 00:00:00 0 21504 21504 : nan : -1
32 : 2001-01-11 00:00:00 0 21504 21504 : nan : -2
33 : 2001-01-11 00:00:00 0 21504 21504 : nan : -3
34 : 2001-01-12 00:00:00 0 21504 21504 : nan : -1
35 : 2001-01-12 00:00:00 0 21504 21504 : nan : -2
36 : 2001-01-12 00:00:00 0 21504 21504 : nan : -3
37 : 2001-01-13 00:00:00 0 21504 21504 : nan : -1
38 : 2001-01-13 00:00:00 0 21504 21504 : nan : -2
39 : 2001-01-13 00:00:00 0 21504 21504 : nan : -3
40 : 2001-01-14 00:00:00 0 21504 21504 : nan : -1
41 : 2001-01-14 00:00:00 0 21504 21504 : nan : -2
42 : 2001-01-14 00:00:00 0 21504 21504 : nan : -3
43 : 2001-01-15 00:00:00 0 21504 21504 : nan : -1
44 : 2001-01-15 00:00:00 0 21504 21504 : nan : -2
45 : 2001-01-15 00:00:00 0 21504 21504 : nan : -3
46 : 2001-01-16 00:00:00 0 21504 21504 : nan : -1
47 : 2001-01-16 00:00:00 0 21504 21504 : nan : -2
48 : 2001-01-16 00:00:00 0 21504 21504 : nan : -3
49 : 2001-01-17 00:00:00 0 21504 21504 : nan : -1
50 : 2001-01-17 00:00:00 0 21504 21504 : nan : -2
51 : 2001-01-17 00:00:00 0 21504 21504 : nan : -3
52 : 2001-01-18 00:00:00 0 21504 21504 : nan : -1
53 : 2001-01-18 00:00:00 0 21504 21504 : nan : -2
54 : 2001-01-18 00:00:00 0 21504 21504 : nan : -3
55 : 2001-01-19 00:00:00 0 21504 21504 : nan : -1
56 : 2001-01-19 00:00:00 0 21504 21504 : nan : -2
57 : 2001-01-19 00:00:00 0 21504 21504 : nan : -3
58 : 2001-01-20 00:00:00 0 21504 21504 : nan : -1
59 : 2001-01-20 00:00:00 0 21504 21504 : nan : -2
60 : 2001-01-20 00:00:00 0 21504 21504 : nan : -3
61 : 2001-01-21 00:00:00 0 21504 21504 : nan : -1
62 : 2001-01-21 00:00:00 0 21504 21504 : nan : -2
63 : 2001-01-21 00:00:00 0 21504 21504 : nan : -3
64 : 2001-01-22 00:00:00 0 21504 21504 : nan : -1
65 : 2001-01-22 00:00:00 0 21504 21504 : nan : -2
66 : 2001-01-22 00:00:00 0 21504 21504 : nan : -3
67 : 2001-01-23 00:00:00 0 21504 21504 : nan : -1
68 : 2001-01-23 00:00:00 0 21504 21504 : nan : -2
69 : 2001-01-23 00:00:00 0 21504 21504 : nan : -3
70 : 2001-01-24 00:00:00 0 21504 21504 : nan : -1
71 : 2001-01-24 00:00:00 0 21504 21504 : nan : -2
72 : 2001-01-24 00:00:00 0 21504 21504 : nan : -3
73 : 2001-01-25 00:00:00 0 21504 21504 : nan : -1
74 : 2001-01-25 00:00:00 0 21504 21504 : nan : -2
75 : 2001-01-25 00:00:00 0 21504 21504 : nan : -3
76 : 2001-01-26 00:00:00 0 21504 21504 : nan : -1
77 : 2001-01-26 00:00:00 0 21504 21504 : nan : -2
78 : 2001-01-26 00:00:00 0 21504 21504 : nan : -3
79 : 2001-01-27 00:00:00 0 21504 21504 : nan : -1
80 : 2001-01-27 00:00:00 0 21504 21504 : nan : -2
81 : 2001-01-27 00:00:00 0 21504 21504 : nan : -3
82 : 2001-01-28 00:00:00 0 21504 21504 : nan : -1
83 : 2001-01-28 00:00:00 0 21504 21504 : nan : -2
84 : 2001-01-28 00:00:00 0 21504 21504 : nan : -3
85 : 2001-01-29 00:00:00 0 21504 21504 : nan : -1
86 : 2001-01-29 00:00:00 0 21504 21504 : nan : -2
87 : 2001-01-29 00:00:00 0 21504 21504 : nan : -3
88 : 2001-01-30 00:00:00 0 21504 21504 : nan : -1
89 : 2001-01-30 00:00:00 0 21504 21504 : nan : -2
90 : 2001-01-30 00:00:00 0 21504 21504 : nan : -3
91 : 2001-01-31 00:00:00 0 21504 21504 : nan : -1
92 : 2001-01-31 00:00:00 0 21504 21504 : nan : -2
93 : 2001-01-31 00:00:00 0 21504 21504 : nan : -3
cdo info: Processed 1999872 values from 3 variables over 31 timesteps ( 0.13s )
Any help resolving this issue would be greatly appreciated.
Cheers, Andreas.
Replies (1)
RE: reproduce griddescription / remapping issue - Added by Andreas Hilboll about 12 years ago
Sorry for the noise, but the problem is solved. The input files were corrupt in the sense that they contained wrong rotated-pole coordinates :-/
Cheers, Andreas.