aeroval's time colocation is strange when colocate_time=True is set

[jgriesfeller]

dataset is missing years 2014 to 2016:

aerocom3_ADV_LTS_v1_od550aer_Column_1995_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_1996_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_1997_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_1998_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_1999_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2000_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2001_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2002_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2003_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2004_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2005_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2006_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2007_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2008_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2009_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2010_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2011_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2012_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2017_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2018_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2019_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2020_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2021_daily.nc
aerocom3_ADV_LTS_v1_od550aer_Column_2022_daily.nc

but with colocate_time=True there's values during the missing time frame anyway:

with colocate_time=False the gap is there as expected:

I wonder if the time colocation just uses the nearest neighbour regardless how "near" that neighbour is.

[lewisblake]

Similar related issues: #736, #755, #762

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