#! /bin/csh -fe
if ($#argv < 2)then
  echo "ERS_ESA_SLC: read an ERS SLC Exabyte processed at ESRIN or DPAF 06-Sep-2005"
  echo "usage: ERS_ESA_SLC <orbit> <device> " 
  echo "       <orbit>   orbit identifier (example: orbit number)"
  echo "       <device>  EXABYTE tape device (no rewind); example: /dev/rmt/0mn"
  exit
endif

set EXABYTE = $2
rm -f $1.par.out

echo "Reading ESA ERS SLC tape..."

echo "reading CEOS volume directory file: $1.vdf"
dd bs=360 if=$EXABYTE of=$1.vdf

echo "reading CEOS SAR leader file: $1.ldr"
dd bs=16384 if=$EXABYTE of=$1.ldr

echo "reading single look complex (SLC) image file: $1.esa_slc" 
dd bs=19612 if=$EXABYTE of=$1.esa_slc

echo "reading CEOS null volume directory file: $1.nvdf"
dd bs=360 if=$EXABYTE of=$1.nvdf

echo "creating ISP SLC parameter file: $1.slc.par"
echo "orbit $1 "| par_ESA_ERS $1.ldr $1.par > $1.par.out

set w1 = `awk '$1 == "range_samples:" {print $2}' `
echo number of range samples/line: $w1

echo "calculating 20-look SUN rasterfile image from the SLC image: $1.slc.ras"
echo "rasERS_SLC $1.esa_slc $w1 1 0 2 10 1.0 .35 1"
rasERS_SLC $1.esa_slc $w1 1 0 2 10 1.0 .35 1

echo "computing doppler centroid from SLC data..."
echo "az_spec_ESA $1.esa_slc $1.par $1.azspec > $1.azspec.out "
echo "y" | az_spec_ESA $1.esa_slc $1.par $1.azspec > $1.azspec.out
echo "  "

echo "ERS_ESA_SLC completed"