# grav_down.com
# Makes bandpass filtered and draped gravity.
# Expects a topo_lowpass.img in this directory.
#
# Version 23 February 2009
#
# First high-pass the gravity: 
#
#./src/img_filter -V -Fh $GMT_IMGDIR/grav.img.18.1 -Ograv_high.img
#
# Next, attenuate 2 mGal noise:
#
#./src/img_erf -V -S20 grav_high.img -Ograv_down_input.img
cp $GMT_IMGDIR/grav.img.18.1 grav_down_input.img
#
# Now filter the inputs to go down.
#
./src/img_filter -V -W -D0 grav_down_input.img -Odown0.img
./src/img_filter -V -W -D1 grav_down_input.img -Odown1.img
./src/img_filter -V -W -D2 grav_down_input.img -Odown2.img
./src/img_filter -V -W -D3 grav_down_input.img -Odown3.img
./src/img_filter -V -W -D4 grav_down_input.img -Odown4.img
./src/img_filter -V -W -D5 grav_down_input.img -Odown5.img
./src/img_filter -V -W -D6 grav_down_input.img -Odown6.img
#
./src/img_drape -V topo_lowpass.img -Ograv_drape.img -V
/bin/rm -f down?.img