CDO

I am converting 1km Bedmap2 Antarctic ice geometry data (2GB) to a 15km grid. Conservative mapping works for coarse resolution (20, 30, 50km) but not for the finer ones (15,12,10,7,...km)...

cdo gencon,targetgrid_15km.nc bedmap2_1km_input.nc bedmap_15km_weights.nc

_cdo gencon: SCRIP first order conservative weights from curvilinear (6667x6667) to curvilinear (400x400) grid
_cdo gencon: 6%
_cdo gencon (Abort): Integration stalled: num_subseg exceeded limit (grid1^6136960: lon1=3.14677 lon2=3.14677 lat1=-1.18782 lat2=-1.18767)!

What could be the reason?
Thanks,
Torsten

cdo sinfo:

targetgrid_15km.nc
1 : curvilinear : points=160000 (400x400)
lon : -179.898 to 179.795 degrees_east
lat : -89.9349 to -50.1077 degrees_north
available : cellbounds
data:
x = -2795000, -2780000, -2765000 .... 3160000, 3175000, 3190000 ;
y = -2795000, -2780000, -2765000, .... 3160000, 3175000, 3190000 ;

bedmap_1km.nc
Grid coordinates :
1 : curvilinear : points=44448889 (6667x6667)
lon : -179.983 to 180 degrees_east
lat : -90 to -48.4644 degrees_north
available : cellbounds
data:
x = -3333000, -3332000 .... 3332000, 3333000 ;
y = -3333000, -3332000 .... 3332000, 3333000 ;