Awk not ouputting results via echo

[Lester Anderson]

Hello,

Having sorted how to access a separate drive location, I have expanded
the script to include an awk section which processes new coordinate
limits which should pass to img2grd to extract the data grids.
However, the awk scripting does not seem to generate any data - is
there something I am missing? Modified from a published script

#!/bin/bash
ruta_elev="Q:/geophys/Potential-field datasets/Topography/topo_17.1.img"
ruta_grav="Q:/geophys/Potential-field datasets/Gravity/grav.img.23.1"
lon_min=-12
lon_max=0
lat_min=28
lat_max=39
R_d=167
R_i=20

echo $lon_min $lon_max $lat_min $lat_max $R_d $R_i |
awk "{R_t=6370;
      pi=3.14159;
      lat_av=(($lat_max+$lat_min)/2)*(pi/180.);
      lon_av=(($lon_min+$lon_max)/2);
      d_lat_e=($R_d/R_t)*180./pi;
      d_lon_e=($R_d/(R_t*cos(lat_av)))*180./pi;
      d_lat_i=($R_i/R_t)*180./pi;
      d_lon_i=($R_i/(R_t*cos(lat_av)))*180./pi;
      lon_e_min=$lon_min-d_lon_e;
      lon_e_max=$lon_max+d_lon_e;
      lat_e_min=$lat_min-d_lat_e;
      lat_e_max=$lat_max+d_lat_e;
      lon_i_min=$lon_min-d_lon_i;
      lon_i_max=$lon_max+d_lon_i;
      lat_i_min=$lat_min-d_lat_i;
      lat_i_max=$lat_max+d_lat_i;
      print lon_e_min,lon_e_max,lat_e_min,lat_e_max,lon_i_min,lon_i_max,lat_i_min,lat_i_max,lat_av*180./pi,lon_av;
}" | read lon_e_min lon_e_max lat_e_min lat_e_max lon_i_min lon_i_max
lat_i_min lat_i_max lat_av lon_av
proj='m'$lon_av'/'$lat_av'/16'
echo $lon_e_min $lon_e_max $lat_e_min $lat_e_max $lon_i_min $lon_i_max
$lat_i_min $lat_i_max $lat_av $lon_av
#
img2grd "$ruta_elev"  -V -T1
-R$lon_e_min/$lon_e_max/$lat_e_min/$lat_e_max -S1 -Gelev.grd -I1m -D
img2grd "$ruta_grav" -T1 -V
-R$lon_e_min/$lon_e_max/$lat_e_min/$lat_e_max -S0.1 -GFA.grd -I1m -D
#

Any pointers on this, thanks

Lester

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