CDO

I dont think so. For example remapdis uses a search radius of 180 degrees. Hence, if you only have regional data, the rest of the globe will look awkward. If you want something more realistic, use remapcon.

cheers
ralf

Thank you Ralf.

How about remapnn and remaplaf?

remapnn works in the same way, you will get "artefacts" from the the other side of the globe. remaplaf creates artefacts in N-S-direction. For avoiding this, you should use remapcon.

hth
ralf

You can switch off the extrapolation by setting the environment variable

REMAP_EXTRAPOLATE=off

The values outside the initial region created with remaplaf are wrong. This bug will be fixed in the next CDO release. Thanks for the report!

Uwe Schulzweida wrote:

You can switch off the extrapolation by setting the environment variable
[...]

..... I should have know that ;-)

Thank you Uwe.

Hi Uwe and Ralf,

I tried

export REMAP_EXTRAPOLATE=off

then run the cdo code. But I did not see the change. Could you tell me what to do next?

Thanks,
Jay

Are you still using 1.6.9?

Yes.

It takes long time for my IT dept to update the server.

With Anaconda, you can do it yourself without bothering your admins.

REMAP_EXTRAPOLATE=off does not work with 1.6.9?

No write permissions with conda ...

Jay Su wrote:

REMAP_EXTRAPOLATE=off does not work with 1.6.9?

Could be that it was introduced in a later version

No write permissions with conda ...

default is to install it into your home directory - so you should not have permission problems.