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The Satellite Application Facility on Climate Monitoring
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The Satellite Application Facility on Climate Monitoring provides satellite-derived products and services for climate monitoring.

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No. 139: Bug in longitude information in CLARA-A2, CLARA-A2.1 and AVHRR ICDR products for Southern Polar Region products

A bug in the longitude information in CLARA-A2, CLARA-A2.1 and AVHRR ICDR products for the Southern Polar region has been identified (area identifier “SP” in filename). The longitude information is erroneously flipped relative to the data fields of cloud properties and surface albedo. The following products are affected:

Product nameTemporal resolutionCM-identifierProduct family
CFC – Fractional cloud coverdaily and monthly meanCM-11011
CM-11015
CM-6010
CLARA-A ed. 2
CLARA-A ed. 2.1
ICDR AVHRR
CPH – Cloud phasedaily and monthly meanCM-11041
CM-11045
CLARA-A ed. 2
CLARA-A ed. 2.1
CTO – Cloud top parameters CTT, CTP
and CTH
daily and monthly meanCM-11031
CM-11035
CM-6030
CLARA-A ed. 2
CLARA-A ed. 2.1
ICDR AVHRR
IWP – Ice water pathdaily and monthly meanCM-11061
CM-11065
CLARA-A ed. 2
CLARA-A ed. 2.1
LWP – Liquid water pathdaily and monthly meanCM-11051
CM-11055
CLARA-A ed. 2
CLARA-A ed. 2.1
SAL – Surface albedopentad and monthly meanCM-11221
CM-11225
CM-6220
CLARA-A ed. 2
CLARA-A ed. 2.1
ICDR AVHRR

The longitude information can easily be corrected by flipping the longitude fields, e.g. in PYTHON syntax for a file with filename <filename.nc>:
import numpy
import xarray

file = xarray.open_dataset('<filename.nc>’)
lon = file['lon']
lon_corrected = numpy.flip(lon, axis=1) # flip the X-axis

Only the products for the area “Southern Polar Region” (identifier “SP” in filename) are affected. The longitude information for the global coverage (“GL”) as well as for the Northern Polar areas (“NP”) is correct.

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