1/ go to geojson.io draw bounding box, save as bbox.geojson 2/ cut.sh big.pbf bbox.geojson small.pbf

cut.sh

#!/usr/bin/env bash

set -o errexit
set -o pipefail
set -o nounset


if [ $# -ne 3 ]; then
    echo "Usage: cut.sh planet.pbf bbox.geojson outfile"
    exit 1
fi

readonly bbox=$(jq --raw-output '.features[0].geometry.coordinates[0] | "top=" + ( .[1][1] | tostring) + " left=" + ( .[0][0] | tostring ) + " bottom=" + ( .[0][1] | tostring ) + " right=" + ( .[2][0] | tostring )' "${2}")

osmosis \
  --read-pbf "${1}" \
  --bounding-box ${bbox} \
  --write-pbf "${3}"