localosmfeature2geojson



#!/bin/sh
#
# Copyright © 2014 Jonas Smedegaard <dr@jones.dk>
# Description: resolve GeoJSON from OSM way or relation.
#
# 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 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be 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.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Depends: gdal-bin perl-modules

set -eu

# type must be either polygons or lines
type="$1"; shift

features=$*

onlineosmxml2geojson() {
    set -e
    echo '['
    first=yes
    for feature in "$@"; do
        url="http://www.openstreetmap.org/api/0.6/$feature/full"
        [ -n "$first" ] || echo ','
        case "$type" in
          polygons)
            ogr2ogr --config OSM_USE_CUSTOM_INDEXING NO -nlt PROMOTE_TO_MULTI -f GeoJSON /vsistdout/ /vsicurl_streaming/"$url" multipolygons
            ;;
          lines)
            ogr2ogr --config OSM_USE_CUSTOM_INDEXING NO -nlt PROMOTE_TO_MULTI -f GeoJSON /vsistdout/ /vsicurl_streaming/"$url" multilinestrings
            ;;
        esac
        first=
    done
    echo ']'
}

onlineosmxml2geojson $features \
    | json_pp -json_opt pretty,canonical \
    | perl -0 -pe 's/   /\t/g; s/},\s*{/}, {/g; s/\[\s*([\d.,]+)\s*([\d.]+)\s*\]/[$1 $2]/g'