Okay, I took my advice and created reset_GPS.lua. It works with my camera,
but I'm not sure if it works with others, so I've commented out all the
action lines and put in print lines to say what it would do. Run darktable
from a console with -d lua then select an image and click the "reset GPS
info" button in the selected images module. You can test it against images
with good GPS data and see if the answers match.
Bill
On Mon, Jun 15, 2020 at 2:54 PM William Ferguson <[email protected]>
wrote:
> The low tech way would be go to the map view and drag them back where they
> belong (if you know where that is).
>
> The higher tech way would be to copy clear_GPS_info.lua and rename it to
> reset_GPS_info.lua, then change the inner loop to run exiv2 against the
> file, retrieve the gps info, and set it.
>
> Another way would be to do a feature request for an option to not
> overwrite existing GPS data when doing a geotag.
>
> Bill
>
> On Mon, Jun 15, 2020 at 1:51 PM August Schwerdfeger <
> [email protected]> wrote:
>
>> When applying a geotag to an image from a GPX file, it automatically
>> clobbers any geotag that had been obtained from the file itself on import.
>> At this point, the only way I have found to get the in-file geotag back is
>> to remove the image from the database, delete the XMP sidecar, then
>> re-import.
>>
>> Is there any nicer way of doing this (other than remembering to add a
>> collect-by-geotag rule to exclude already-geotagged images before applying)?
>>
>> --
>> August Schwerdfeger
>> [email protected]
>>
>>
>> ____________________________________________________________________________
>> darktable user mailing list to unsubscribe send a mail to
>> [email protected]
>>
>
____________________________________________________________________________
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--[[
reset_GPS.lua - export and edit with GIMP
Copyright (C) 2016 Bill Ferguson <[email protected]>.
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 of the License, 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/>.
]]
--[[
reset_GPS - clear GPS data from selected image(s)
This shortcut removes the GPS coordinate data from the selected images.
ADDITIONAL SOFTWARE NEEDED FOR THIS SCRIPT
* None
USAGE
* require this script from your main lua file
* select an image or images
* click the shortcut, clear GPS data
BUGS, COMMENTS, SUGGESTIONS
* Send to Bill Ferguson, [email protected]
CHANGES
]]
local dt = require "darktable"
local du = require "lib/dtutils"
local df = require "lib/dtutils.file"
du.check_min_api_version("3.0.0", "reset_GPS")
local PS = dt.configuration.running_os == windows and '\\' or '/'
local gettext = dt.gettext
-- not a number
local NaN = 0/0
local exiv2 = df.check_if_bin_exists("exiv2")
if exiv2 then
-- Tell gettext where to find the .mo file translating messages for a particular domain
gettext.bindtextdomain("reset_GPS",dt.configuration.config_dir.."/lua/locale/")
local function _(msgid)
return gettext.dgettext("reset_GPS", msgid)
end
local function extract_altitude(dat)
return string.match(dat, "(%d-.?%d?) m$")
end
local function extract_degrees(dat)
dt.print_log("dat is " .. dat)
local deg = nil
local min = nil
deg, min = string.match(dat, "(%d-)deg (%d+.?%d+)")
if deg then
dt.print_log("deg is " .. deg)
end
if mins then
dt.print_log("min is " .. min)
end
if deg then
if min then
deg = deg + min / 60.
dt.print_log("deg is " .. deg)
end
end
if deg then
dt.print_log("deg is " .. deg)
else
dt.print_log("returning nil for dat " .. dat)
end
return deg
end
local function process_data(ref, dat)
-- dt.print_log("ref is " .. ref)
-- dt.print_log("dat is " .. dat)
local sign = 1
local result = nil
if string.match(ref, "Above") then
sign = 1
result = extract_altitude(dat) * sign
elseif string.match(ref, "Below") then
sign = -1
result = extract_altitude(dat) * sign
elseif string.match(ref, "South") or string.match(ref, "West") then
sign = -1
result = extract_degrees(dat) * sign
elseif string.match(ref, "North") or string.match(ref, "East") then
sign = 1
result = extract_degrees(dat) * sign
else
result = nil
end
return result
end
local function reset_GPS(images)
local exiv2_args = " -g GPSInfo "
for _, image in ipairs(images) do
-- set the location information to Not a Number (NaN) so it displays correctly
dt.print_log("processing " .. image.filename)
local p = io.popen(exiv2 .. exiv2_args .. image.path .. PS .. image.filename)
if p then
local altitude = nil
local latitude = nil
local longitude = nil
local GPSLatitudeRef = nil
local GPSLatitude = nil
local GPSLongitudeRef = nil
local GPSLongitude = nil
local GPSAltitudeRef = nil
local GPSAltitude = nil
for line in p:lines() do
if string.match(line, "GPSLatitudeRef") then
GPSLatitudeRef = line
elseif string.match(line, "GPSLatitude") then
GPSLatitude = line
elseif string.match(line, "GPSLongitudeRef") then
GPSLongitudeRef = line
elseif string.match(line, "GPSLongitude") then
GPSLongitude = line
elseif string.match(line, "GPSAltitudeRef") then
GPSAltitudeRef = line
elseif string.match(line, "GPSAltitude") then
GPSAltitude = line
end
end
p:close()
if GPSAltitudeRef and GPSAltitude then
altitude = process_data(GPSAltitudeRef, GPSAltitude)
end
if GPSLatitudeRef and GPSLatitude then
latitude = process_data(GPSLatitudeRef, GPSLatitude)
end
if GPSLongitudeRef and GPSLongitude then
longitude = process_data(GPSLongitudeRef, GPSLongitude)
end
if latitude and longitude then
if altitude then
--image.elevation = alititude
dt.print_log("altitude detected, would set elevation to " .. altitude)
end
--image.latitude = latitude
dt.print_log("latitude detected, would set latitude to " .. latitude)
--image.longitude = longitude
dt.print_log("longitude detected, would set longitude to " .. longitude)
else -- no gps info in image, so just clear it
dt.print_log("no gps data detected, resetting to NaN")
--image.elevation = NaN
--image.latitude = NaN
--image.longitude = NaN
end
else
dt.print("Unable to read GPSInfo from image")
dt.print_error("Unable to read GPSInfo from image")
end
end
end
dt.gui.libs.image.register_action(
_("reset GPS data"),
function(event, images) reset_GPS(images) end,
"reset GPS data"
)
dt.register_event(
"shortcut",
function(event, shortcut) reset_GPS(dt.gui.action_images) end,
"reset GPS data"
)
else
dt.print("Unable to locate exiv2. Please ensure it is installed and in the path,\nor specifiy it's location using executable manager.")
end
