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#!/bin/bash
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# Geotag images
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# Copyright (C) 2017 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 (better data)
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USERNAME=Fincer #For API (data request)
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############################
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INTERNET_TEST=$(ping -c 3 nominatim.openstreetmap.org 2>&1 | grep -c "unknown host") #Ping Github three times and look for string 'unknown host'
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if [[ ! $INTERNET_TEST -eq 0 ]]; then #If 'unknown host' string is found, then
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echo -e "\nCan't connect to geoservice provider (Nominatim). 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 $(echo "${@}"); 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 ]]; then
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echo -e "$IMAGE_BASENAME: Missing coordinates. Are you sure you have geotagged the photo?\n"
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exit
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else
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LATITUDE=$(exiftool -n -p '$GPSLatitude' "${IMAGE}")
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LONGITUDE=$(exiftool -n -p '$GPSLongitude' "${IMAGE}")
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# Clear previous geonames information
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exiftool -Location= -LocationShownCity= -LocationShownCountryName= -LocationShownProvinceState= -LocationShownSublocation= -Country-PrimaryLocationName= -Sub-location= -Country= -City= -State= -Province-State= -GPSAltitude= "${IMAGE}" -overwrite_original
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#if [[ $(exiftool -p '$Country-PrimaryLocationName' "${IMAGE}" | awk '{print NF}') != 1 ]]; then
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echo -e "$IMAGE_BASENAME: retrieving country information.\n"
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reversegeo "${IMAGE}"
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#fi
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# Reference: http://www.geonames.org/export/web-services.html
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# Get elevation by retrieving a ASTER DEM value from GeoNames API server, grid size 30x30m
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# There are several error factors:
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# DEM Grid size
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# General inaccurancies in DEM model
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# Geoid model & projection errors
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# Coordinate errors
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# Variations in (estimated) height values
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# So the retrieved elevation value is just a rough estimation here
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ALTITUDE=$(curl -s "http://api.geonames.org/astergdem?lat=$LATITUDE&lng=$LONGITUDE&username=$USERNAME")
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# IF successful answer, then
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if [[ $ALTITUDE =~ '^[0-9]+$' ]]; 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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done
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