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#!/bin/env bash
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# Geotag images
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# Copyright (C) 2017,2023 Pekka Helenius
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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###############################################
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# TODO Coordinate threshold = Grid size is 30x30m?
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# TODO Find API for ASTER DEM v2 (provides better data)
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# Username for REST API data request
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USERNAME=<PUT_YOUR_USERNAME_HERE>
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############################
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# Ping openstreetmap.org three times.
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PING_ADDRESS="nominatim.openstreetmap.org"
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INTERNET_TEST=$(ping -c 3 "${PING_ADDRESS}" 2>&1 | grep -c "unknown host")
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if [[ ! "${INTERNET_TEST}" -eq 0 ]]
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then
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echo -e "\nCan't connect to the Geo Service provider '${PING_ADDRESS}'. Please check your internet connection and try again.\n"
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exit 1
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fi
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############################
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for IMAGE in $(echo "${@}")
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do
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IMAGE_BASENAME=$(basename "${IMAGE}" | cut -f 1 -d '.')
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IMAGE_EXTENSION=$(echo $(basename "${IMAGE}" | cut -f 2 -d '.' | sed '/^\s*$/d'))
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if [[ $(exiftool -n -p '$GPSLatitude,$GPSLongitude' "${IMAGE}" | awk -F ',' '{print NF}') != 2 ]]
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then
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echo -e "$IMAGE_BASENAME: Missing coordinates. Are you sure you have geotagged the photo?\n"
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exit 0
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else
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LATITUDE=$(exiftool -n -p '$GPSLatitude' "${IMAGE}")
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LONGITUDE=$(exiftool -n -p '$GPSLongitude' "${IMAGE}")
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# Clear previous geonames information.
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exiftool \
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-Location= \
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-LocationShownCity= \
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-LocationShownCountryName= \
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-LocationShownProvinceState= \
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-LocationShownSublocation= \
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-Country-PrimaryLocationName= \
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-Sub-location= \
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-Country= \
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-City= \
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-State= \
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-Province-State= \
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-GPSAltitude= \
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"${IMAGE}" \
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-overwrite_original
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echo -e "$IMAGE_BASENAME: retrieving country information.\n"
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reversegeo "${IMAGE}"
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# Reference: http://www.geonames.org/export/web-services.html
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# Get elevation by retrieving a ASTER DEM value from GeoNames API server, grid size 30x30m
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# There are several error factors:
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# DEM Grid size
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# General inaccurancies in DEM model
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# Geoid model & projection errors
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# Coordinate errors
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# Variations in (estimated) height values
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# So the retrieved elevation value is just a rough estimation here.
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ALTITUDE=$(curl -s "http://api.geonames.org/astergdem?lat=$LATITUDE&lng=$LONGITUDE&username=$USERNAME")
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# If we have a successful answer, then
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if [[ "${ALTITUDE}" =~ '^[0-9]+$' ]]
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then
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exiftool -GPSAltitude="${ALTITUDE}" "${IMAGE}" -overwrite_original
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echo -e "${IMAGE_BASENAME}: Altitude value updated.\n"
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else
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# TODO: If not successful, try again for 2 times, then abort.
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echo -e "${IMAGE_BASENAME}: Couldn't retrieve altitude value.\n"
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fi
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fi
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done
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