OML way to latitude/longitude pair conversion.

omlway2ll.sh

#! /bin/sh

# Convert an OSM way to a set of latitude/longitude pairs. Assumes only one way
# in input.

NODE_PATTERN='<nd ref="\([0-9]\+\)"\/>'
COORD_PATTERN='\-\?[0-9.]\+'
LAT_PATTERN='lat="'"$COORD_PATTERN"'"'
LON_PATTERN='lon="'"$COORD_PATTERN"'"'

if [ $# -eq 0 ]
then
    echo "Usage: $0 http://www.openstreetmap.org/api/0.6/way/<way>" 1>&2
    exit 1
fi

wget -q "$1" -O - | while read line
do
    if echo "$line" | grep -q "$NODE_PATTERN"
    then
        node_id=`echo "$line" | sed -e 's/'"$NODE_PATTERN"'/\1/'`
        node=`wget -q "http://www.openstreetmap.org/api/0.6/node/$node_id" -O -`
        lat=`echo "$node" | grep -o "$LAT_PATTERN" | grep -o "$COORD_PATTERN"`
        lon=`echo "$node" | grep -o "$LON_PATTERN" | grep -o "$COORD_PATTERN"`
        echo "$lat $lon"
    fi
done