N=1
/home/softs/tools/objects/topo_merge -o base-$N -b base.grd /home/softs/data/topography/regional/celtic/1kmdep.spherical.nc
N=$(( $N+1 ))
/home/softs/tools/objects/topo_merge -o base-$N -b base-$(( $N-1 )).grd -p baltic.plg /home/softs/data/topography/regional/baltic/iowtopo2_rev03.grd
N=$(( $N+1 ))
/home/softs/tools/objects/topo_merge -o base-$N -b base-$(( $N-1 )).grd -p gascogne.plg /home/softs/data/topography/regional/nea/gascogne/gascogne.grd
N=$(( $N+1 ))
/home/softs/tools/objects/topo_merge -o base-$N -b base-$(( $N-1 )).grd /home/softs/data/topography/regional/finistere/finistere_3s.spherical.nc
N=$(( $N+1 ))

N=5
/home/softs/tools/objects/topo_merge -o base-$N -b base-$(( $N-1 )).grd -p asturia.plg /home/softs/data/topography/regional/ifremer/atlantic/drogm-Carto-atlanNE-web.spherical.nc  
N=$(( $N+1 ))
/home/softs/tools/objects/topo_merge -o base-$N -b base-$(( $N-1 )).grd -p lusitania.plg /home/softs/data/topography/regional/portugal/XYZWIBM.spherical.nc   
N=$(( $N+1 ))
/home/softs/tools/objects/topo_merge -o base-$N -b base-$(( $N-1 )).grd /home/softs/data/topography/regional/ifremer/medsea/medimap2007-bathy-1km.spherical.nc  

N=8
/home/softs/tools/objects/topo_merge -o base-$N -b base-$(( $N-1 )).grd -p mont-st-michel.plg /home/softs/data/topography/regional/nea/SHOM/bathy_BaieduMont_finale.grd