#!/bin/bash
#
# Simple shell script for building SDF files from SRTM files
# downloaded to the same directory from ftp://e0srp01u.ecs.nasa.gov:21/srtm/version2/
# Inputs the terrain files such as "N42W082.hgt"
# outputs SPLAT-compatible files such as "42:43:82:83.sdf"
# See the official SPLAT documentation for setup details
#
# Written by Austin Wright, VE3NCQ January 29, 2009
#
#******************************************************************************
#                                                                            *
#  This program is free software; you can redistribute it and/or modify it   *
#  under the terms of the GNU General Public License as published by the     *
#  Free Software Foundation; either version 2 of the License or any later    *
#  version.								     *
# 									     *
#  This program is distributed in the hope that it will useful, but WITHOUT  *
#  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or     *
#  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License     *
#  for more details.							     *
#									     *
#*****************************************************************************

# This script converted the series from N40W074.hgt to N45W090.hgt
# Change the "n" and "w" variables below to your own starting file
# change the "for a" count to match the number of different lattitudes in .hgt files
# change the "for b" count to match the number of different longitudes in .hgt files
# don't miss any sections
#\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

# place this script in the same directory as the srtm2sdf program included with SPLAT
# make this script executable with chmod (chmod 777 makeSDF.sh)
# the .hgt files should be in the same directory
# don't run as root or the created files won't be accessible
# move the files to the SPLAT working directory, or use the -d switch



n=40 # the starting lattitude > change to the first lattitude in your .hgt sequence

for a in 1 2 3 4 5 6 # the loop count, one for each lattitude in the .hgt files
do
	w=74 # the starting longitude > change to the first longitude in your .hgt sequence
	for b in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 # the loop count, one for each longitude in the .hgt file series
	do
	echo "N"$n"W0"$w".hgt"
	srtm2sdf "N"$n"W0"$w".hgt"
	let "w+=1"
	done
let "n+=1"
done

exit 0

# hopefully this script will save somebody a few minutes of console time