'cdo showlevel' shows latitudes rather than LEVELs
Hi,I have a file named temp.nc, and I want to extract the SST from it.
Firstly, I checked the dimension of the temp variable:
***********************************************ncdump -c temp.nc
dimensions:
lon = 360 ;
lat = 180 ;
depth = 60 ;
time = 12 ;
time_yr = 12 ;
...
...
lat = -89.5, -88.5,..., 88.5, 89.5 ;
depth = 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 115, 130, 150, 180, 220,
270, 330, 400, 480, 570, 670, 780, 900, 1030, 1160, 1300, 1450, 1600,
1750, 1900, 2050, 2200, 2350, 2500, 2650, 2800, 2950, 3100, 3250, 3400,
3550, 3700, 3850, 4000, 4150, 4300, 4450, 4600, 4750, 4900, 5050, 5200,
5350, 5500, 5650, 5800, 5950, 6100, 6250 ;
***********************************************
Then I know the depth of vertical levels (i.e.,from 0 to 6250).
Then I use 'cdo sellevel' to extract SST data:
***********************************************cdo sellevel,0 temp.nc sst.nc
cdo sellevel (Warning): Level 0 not found! cdo sellevel (Abort): No variables selected!***********************************************
I don't know why this happened. But to find out why, I rechecked the vertical levels:
***********************************************cdo showlevel temp.nc
-89.5 -88.5 -87.5 ... 86.5 87.5 88.5 89.5
***********************************************
It seems 'cdo showlevel' didn't show the vertical levels; instead, it showed the latitudes.
I don't know why this happened. Any suggestions are appreciated 
Best,
Shizhu