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#!/bin/bash
# This shell script copies Xastir snapshots from the directory in which
# they are created ~/.xastir/temp to a directory where a web server can deliver
# them as a kml feed to overlay the current snapshot from on the terrain in a kml
# capable application that is subscribed to the feed.
#
# You will need to set two parameters for this script:
# 1. set DIR= to the directory into which you wish to copy the snapshot files.
# This can be a directory on a remote webserver mounted using sshfs.
# 2. change www.example.com to the address of your webserver. You will also
# need to change the link specified in kml_snapshot_feed.kml
#
# You can copy the kml_snapshot_feed.kml into the web folder, and load the
# http://www.example.com/tracks/kml_snapshot_feed.kml file into your KML
# application instead of http://www.example.com/tracks/snapshot.kml, and run
# this shell script with cron to periodically update the snapshot.kml file.
# This should enable your KML application to refresh the snapshots in sync
# with their creation by Xastir.
#
# Note: GE will load jpg files but not png files, so ImageMagick's
# convert is used here to convert the snapshot.png produced by Xastir to
# a snapshot.jpg file.
#
DIR=/var/www/htdocs/tracks
cd ~/.xastir/tmp
convert ./snapshot.png $DIR/snapshot.jpg
cat snapshot.kml | gawk -- ' { gsub(/<href>/,"&http://www.example.com/tracks/") } { gsub(/snapshot.png/,"snapshot.jpg") } { print } ' > $DIR/snapshot.kml
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