#
#   first dump the ship slope as xyz

rm -f ship_slope_world.xyz 
rm -f block_ship_slope_world.xyz block_ship_slope_world.grd

awk '{print $2, $3, sqrt($6*$6)'} slope1.dat  > ship_slope_world.xyz
awk '{print $2, $3, sqrt($6*$6)'} slope2.dat >> ship_slope_world.xyz
awk '{print $2, $3, sqrt($6*$6)'} slope3.dat >> ship_slope_world.xyz
awk '{print $2, $3, sqrt($6*$6)'} slope4.dat >> ship_slope_world.xyz

#  now blockmedian and grid

#blockmedian  ship_slope_world.xyz -R0/360/-72/72 -I.25/.2 > block_ship_slope_world.xyz
blockmean  ship_slope_world.xyz -R0/360/-72/72 -I.25/.2 > block_ship_slope_world.xyz
surface block_ship_slope_world.xyz  -R0/360/-72/72 -I.25/.2  -T.25 -L -Ll0.0 -Gjunk.grd -V
grdfilter junk.grd -Gblock_ship_slope_world.grd -D3 -Fm60 -R0./360./-72/72 -I.25/.2 -V