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Opening netcdf - Only displays one cell

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Grant
Grant 2013-4-30
关闭： MATLAB Answer Bot 2021-8-20
I've downloaded this file:
http://websrv.cs.umt.edu/isis/images/a/a5/Greenland_5km_v1.1.nc
from NASA's SEARISE website - Greenland standard data set at (11mb): http://websrv.cs.umt.edu/isis/index.php/Present_Day_Greenland
When I open it with (or other modes I've tried):
ncid = netcdf.open ('Greenland_5km_dev1.0.nc', 'WRITE');
It doesn't give me an error, but all I get is a variable with one cell, 1,1 with 212 written in it. It should be a grid of data on Greenland, though I'm not exactly sure how it would be displayed since I haven't been able to open it.
Thanks

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Ashish Uthama
Ashish Uthama 2013-4-30
Grant,
To read data, your best bet is to use ncread.
>> landcover = ncread('Greenland_5km_v1.1.nc','landcover');
>> whos
Name Size Bytes Class Attributes
landcover 301x561 675444 int32
If your version of MATLAB does not have this function, you could look at using the low-level library APIs like netcdf.getvar (see example).
  2 个评论
Grant
Grant 2013-5-1
Thanks. I don't have ncread but I used netcdf.getvar.
data = netcdf.getVar (ncid, 'Greenland_5km_v1.1 (1).nc') ??? Error using ==> getVar at 87 Greenland_5km_v1.1 (1).nc is not allowed as an output netCDF datatype
Do you know why this may be the case?
Ashish Uthama
Ashish Uthama 2013-5-1
Grant, please do have a look at the example in the link above. Using the low-level library API is a bit more complex (which is why ncread was added in later releases). The API requires a user to know/find the variable index and then use that as a second argument.
If, after you try the example, you need more help, post back.
If you find this interface too complex, you could also consider using snctools.

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