2020-01-06 case comes out all blank

pytroll / fogpy

Satellite based fog and low stratus detection and nowcasting

http://fogpy.readthedocs.io/en/latest

GNU General Public License v3.0

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Closed gerritholl closed 4 years ago

gerritholl commented 4 years ago

On 2020-01-06, there was widespread valley fog in Germany, as confirmed by direct personal ground observation by myself.

tmpa489rof_

Unfortunately, fogpy fails to deliver any results and the resulting images are all black. The problem is exposed at least at the clustering step:

[DEBUG: 2020-01-08 11:00:04 : fogpy.algorithms] Number of spatial coherent fog cloud clusters: --

gerritholl commented 4 years ago

This happens because there are no results there for the NWCSAF product cmic_lwp. For the entire eurol area:

blended-202001061000-eurol cmic_lwp

When the entire LWP image consists of nans, this goes undetected by fogpy and it produces garbage.

gerritholl commented 4 years ago

Apparently, NWCSAF CPP-derived products including CMIC LWP are only produced up to 70° SZA.

This is a serious limitation for fogpy.