#
# prepare the bird strain map
#
#dos2unix ../bird/exx.dat
#dos2unix ../bird/exy.dat
#dos2unix ../bird/eyy.dat
awk '{print $3}' <  ../bird/eyy.dat > eyy 
awk '{print $3}' <  ../bird/exy.dat > exy 
paste ../bird/exx.dat eyy exy > all.dat
awk '{print $1,$2,sqrt($3*$3+$4*$4+2*$5*$5)*3.1557e16 }' < all.dat > secinv.gmt
xyz2grd secinv.gmt -Gjunk.grd -I0.2 `minmax secinv.gmt -I.2` -NNaN
grdsample junk.grd  -I.02 `minmax secinv.gmt -I.2` -Gmask.grd
surface secinv.gmt -I.02 `minmax secinv.gmt -I.2` -T.5 -Li0. -Gsurf.grd -V
grdmath surf.grd mask.grd OR = secinv.grd
grdsample secinv.grd `grdinfo grad.grd -I0.1/0.1` -I0.00833333/0.00833333 -F -V -Gbird_strain.grd
#
#  clean up
#
rm eyy exy all.dat secinv.gmt secinv.grd  surf.grd mask.grd junk.grd