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  #11  
Old November 6th 17, 01:41 PM posted to rec.photo.digital
Mayayana
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Posts: 1,505
Default Geotagging app

"PeterN" wrote

| I do it the easy way. I take a snap of the location with my iPhone. All
| relevant information is recorded.
|

For what it's worth, I got curious and looked at
some photos a friend took at Mt Desert Island last
year, on an iPhone 6. The lat/long seems to be
very close, within yards. The altitude, however,
is not so accurate. A photo of me looking at a rock
on the beach recorded altitude 4.53 meters
(14.8 feet). Another shot taken in the same
spot (within a few feet on a nearly flat beach)
shows 6.6 meters (21.6 feet).
This photo...

http://www.jsware.net/Files2/cliff1.jpg

....shows 58.84 meters (193 feet). We were probably
30-40 feet above the water. There may be variation,
accounting for tides, but it still seems to be inflated
by about 500% and/or to some extent arbitrary. How
can it vary by 50% in the same spot with pictures
taken a few minutes apart? I don't know. Perhaps
different info sources? Maybe a change in cell towers
that caused variations in location?

It might be worthwhile to check some known altitudes
and maybe check those against Google before depending
on the stats. (Though I don't know what one depends on
them for. Why does anyone care about altitude stats
except, maybe, when mountain climbing?)


  #12  
Old November 6th 17, 03:14 PM posted to rec.photo.digital
Tim Watts
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Posts: 52
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On 06/11/17 13:35, Joe Makowiec wrote:
On 03 Nov 2017 in rec.photo.digital, Alfred Molon wrote:

Caan anybody recommend an Android app which records position and
altitude, and later you can add that data to the exif of JPEGs and
RAWs?

I'm using O.I.Share for the E-M1 II but it doesn't record the
altitude.


GPS Essentials:

http://www.gpsessentials.com/

I still haven't figured out everything it does - which is a lot - but it
will record a track (with altitudes) which you can export as a .gpx file.
You can also save waypoints. I use it with GeoSetter (Win only) to geotag
images.

http://www.geosetter.de/en

In spite of what it looks like, geosetter is still in development. Get
the beta, as it has some recent developments which make it more useful:

www.geosetter.de/geosetter_beta.exe


Thank you - I'll be trying those out
  #13  
Old November 6th 17, 03:51 PM posted to rec.photo.digital
android
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Posts: 3,852
Default Geotagging app

In article ,
"Mayayana" wrote:

"PeterN" wrote

| I do it the easy way. I take a snap of the location with my iPhone. All
| relevant information is recorded.
|

For what it's worth, I got curious and looked at
some photos a friend took at Mt Desert Island last
year, on an iPhone 6. The lat/long seems to be
very close, within yards. The altitude, however,
is not so accurate. A photo of me looking at a rock
on the beach recorded altitude 4.53 meters
(14.8 feet). Another shot taken in the same
spot (within a few feet on a nearly flat beach)
shows 6.6 meters (21.6 feet).
This photo...

http://www.jsware.net/Files2/cliff1.jpg

...shows 58.84 meters (193 feet). We were probably
30-40 feet above the water. There may be variation,
accounting for tides, but it still seems to be inflated
by about 500% and/or to some extent arbitrary. How
can it vary by 50% in the same spot with pictures
taken a few minutes apart? I don't know. Perhaps
different info sources? Maybe a change in cell towers
that caused variations in location?

It might be worthwhile to check some known altitudes
and maybe check those against Google before depending
on the stats. (Though I don't know what one depends on
them for. Why does anyone care about altitude stats
except, maybe, when mountain climbing?)


Do your iPhone have a gyroscope? If not then it's obsolete for pinpoint
accuracy navigation!
--
teleportation kills
  #14  
Old November 6th 17, 04:09 PM posted to rec.photo.digital
Mayayana
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Posts: 1,505
Default Geotagging app


"android" wrote

| Do your iPhone have a gyroscope? If not then it's obsolete for pinpoint
| accuracy navigation!

Don't allow cellphones have a gyroscope if they allow
for changing orientation? And why is that needed
for altitude? I assumed the iPhone was calling some
service that uses the cell towers (or satellite?) for
the data.

But you know more than I do. I don't use an iPhone
and can't imagine caring about altitude data for photos.
As I said, this was not my phone. It was a friend taking
pictures with an iPhone 6. Have you tested with your
own phone for altitude accuracy?


  #15  
Old November 6th 17, 04:17 PM posted to rec.photo.digital
nospam
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Posts: 21,703
Default Geotagging app

In article , Mayayana
wrote:


| Do your iPhone have a gyroscope? If not then it's obsolete for pinpoint
| accuracy navigation!

Don't allow cellphones have a gyroscope if they allow
for changing orientation? And why is that needed
for altitude? I assumed the iPhone was calling some
service that uses the cell towers (or satellite?) for
the data.


as usual, you assume wrong.

iphones have a gps, which can show altitude if it's tracking 4 or more
gps satellites, just as any gps would.

a gyro is not relevant.

But you know more than I do.


many people do.

I don't use an iPhone
and can't imagine caring about altitude data for photos.
As I said, this was not my phone. It was a friend taking
pictures with an iPhone 6. Have you tested with your
own phone for altitude accuracy?


it depends on gps reception.
  #16  
Old November 6th 17, 04:33 PM posted to rec.photo.digital
PeterN[_7_]
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Posts: 1,013
Default Geotagging app

On 11/4/2017 5:17 PM, Alan Browne wrote:
On 2017-11-04 10:55, PeterN wrote:
On 11/3/2017 7:00 PM, Alan Browne wrote:
On 2017-11-03 17:39, Alfred Molon wrote:
Caan anybody recommend an Android app which records position and
altitude, and later you can add that data to the exif of JPEGs and
RAWs?

Any trail logger that saves (or exports) date in .kml, .kmz, .gpx,
.log (NMEA sentences) should do the trick.* But do check that it
supports altitude, esp. NMEA files as many do not record altitude.

Google Play is the source.
This looks promising:
https://play.google.com/store/apps/d...otracker&hl=en


I use a German product called "Trails" on my iPhone - alas not
available for Android.






I'm using O.I.Share for the E-M1 II but it doesn't record the
altitude.

As a stopgap you could snap a photo with the Android camera and (if
properly set) that data would be saved in the snap for later transfer
to the other photos. (tedious).

Pretty much any "trail logger" can be used for what you want to do
and usually the "tagging" can be made automated in post process.* You
do need to know the offset from "real time" to your camera's time in
order to do that - no big deal using exiftool.* (ie: your time zone
and the difference between "correct" time and the camera's time
(unless you sync'd it all before going out).

Important note: GPS altitude * altitude above sea level of where you
are as the GPS ellipsoid is not referenced to sea level.



I do it the easy way. I take a snap of the location with my iPhone.
All relevant information is recorded.


That sounds like the hard way given what the OP wants to do.


That well may be. For a lot of images it would be a PITA. I do
geotagging primarily so I can come back to the location, and/or let my
friends know the location. I started doing that after I saw some great
potential shots, but was unable to stop. I have been unable to locate
that area on Google, and I was unable to transfer the locations from my
car's GPS.
A few weeks ago we were just going for a ride, looking for possible fall
foliage shots. I quickly realized that I was a few days early, so I took
some iPhone shots, for general location purposes only.

https://www.dropbox.com/s/awo5errl9x8hojw/Photo%20Oct%2021%2C%201%2051%2038%20PM.jpg?dl=0

https://www.dropbox.com/s/11bsk8ervy7nofb/Photo%20Oct%2021%2C%204%2000%2024%20PM.jpg?dl=0

Unfortunately we had a Nor'easter, that blew away the leaves. But at
lease I can look in that area next year.



The OP's issue is automated tagging his Oly phots.* Similar to me
tagging my SLR phots.* (Though I usually use an independent GPS recorder
I can also use my iPhone for that).

If you record GPS continuously then tagging any number of photos after
the fact takes a minute to set up and a few seconds to execute using a
tool like exiftool or any one of a variety of GUI based tools.

exiftool -geotag=GPS_20171103_162238.log -overwrite_original_in_place
-geosync=-4:00:00 *.dng

(Just need to navigate to the folder containing the dng's before
executing the command.* I keep a "template" of the command in a text
file so I just need to paste that into terminal, modify the gps file
name and let 'er rip).

Recording the position in a single shot is a fine backup, but pretty
tedious if you have 50 - 100 photos to tag afterwards.


Agreed. If geotagging all of my images was important to me, I would
attach a GPS gadget to my camera.

--
PeterN
  #17  
Old November 6th 17, 04:36 PM posted to rec.photo.digital
Mayayana
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Posts: 1,505
Default Geotagging app

"nospam" wrote

| iphones have a gps, which can show altitude if it's tracking 4 or more
| gps satellites, just as any gps would.
|

A quick look around seems to indicate that the GPS
altitude used in cellphones is not very accurate. I
found this, that shows reasonably good results:

https://www.singletracks.com/blog/gp...dedicated-gps/

But those results are better than what I saw,
with a report varying by 50% in the same spot at
almost the same time.

Google Maps seems to be accurate, to the
extent I've used it, but I've only done limited
testing. I guess it depends on how much accuracy
matters to people. I wouldn't want a photo to tell
me I was on a 200' cliff when it was really 30', but
if one only cares in the 1000' range that won't be
a problem.


  #18  
Old November 6th 17, 04:48 PM posted to rec.photo.digital
nospam
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Posts: 21,703
Default Geotagging app

In article , Mayayana
wrote:


| iphones have a gps, which can show altitude if it's tracking 4 or more
| gps satellites, just as any gps would.
|

A quick look around seems to indicate that the GPS
altitude used in cellphones is not very accurate.


it can be very accurate, depending on how many gps satellites are being
tracked.

recent iphones also have a barometer, as do many other smartphones,
wearables and of course, dedicated gps devices (e.g, garmin), which
increases accuracy, particularly indoors.

however, nothing is perfect. my garmin dedicated gps in my car once
told me i was 200 feet below sea level, despite being on a bridge over
a river and with at least 8 sats being tracked. it was wrong. it did
have the correct road, though.
  #19  
Old November 6th 17, 04:57 PM posted to rec.photo.digital
android
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Posts: 3,852
Default Geotagging app

In article ,
nospam wrote:

In article , Mayayana
wrote:


| Do your iPhone have a gyroscope? If not then it's obsolete for pinpoint
| accuracy navigation!

Don't allow cellphones have a gyroscope if they allow
for changing orientation? And why is that needed
for altitude? I assumed the iPhone was calling some
service that uses the cell towers (or satellite?) for
the data.


as usual, you assume wrong.

iphones have a gps, which can show altitude if it's tracking 4 or more
gps satellites, just as any gps would.

a gyro is not relevant.


It sure is! But it could be broken or other factors of this obsolete
design called iPhone 6 could have come into play...

But you know more than I do.


many people do.

I don't use an iPhone
and can't imagine caring about altitude data for photos.
As I said, this was not my phone. It was a friend taking
pictures with an iPhone 6. Have you tested with your
own phone for altitude accuracy?


My phone, an Xperia M4 don't have a gyroscope. It's about the only thing
of substance that it miss, and RAM...

it depends on gps reception.


Youpp, and on the 58th parallel we do have another tilt on most
satellites. They are closer to the horizon, unless they are in closer to
polar orbit. The ESA Galileo system is probably more tailored to our
needs with more satellites higher on the horizon further north:

https://en.wikipedia.org/wiki/File:Galileo_sat_constallation.gif

Navstar:

https://en.wikipedia.org/wiki/File:GPS24goldenSML.gif

The Russian Glosnav is another good complement to Navstar and Galileo.
Android phones uses all three systems simultaneously but dedicated
system based on TomTom and Garmin seem to use Navstar exclusively and
have therefore a longer standalone startup time...

All together he

https://en.wikipedia.org/wiki/Galile...ion%29#/media/
File:Comparison_satellite_navigation_orbits.svg
--
teleportation kills
  #20  
Old November 6th 17, 06:12 PM posted to rec.photo.digital
PeterN[_7_]
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Posts: 1,013
Default Geotagging app

On 11/6/2017 8:41 AM, Mayayana wrote:
"PeterN" wrote

| I do it the easy way. I take a snap of the location with my iPhone. All
| relevant information is recorded.
|

For what it's worth, I got curious and looked at
some photos a friend took at Mt Desert Island last
year, on an iPhone 6. The lat/long seems to be
very close, within yards. The altitude, however,
is not so accurate. A photo of me looking at a rock
on the beach recorded altitude 4.53 meters
(14.8 feet). Another shot taken in the same
spot (within a few feet on a nearly flat beach)
shows 6.6 meters (21.6 feet).
This photo...

http://www.jsware.net/Files2/cliff1.jpg


I remember that area well. I like the fog you caught. Was the camera
level when you took that shot?


...shows 58.84 meters (193 feet). We were probably
30-40 feet above the water. There may be variation,
accounting for tides, but it still seems to be inflated
by about 500% and/or to some extent arbitrary. How
can it vary by 50% in the same spot with pictures
taken a few minutes apart? I don't know. Perhaps
different info sources? Maybe a change in cell towers
that caused variations in location?

It might be worthwhile to check some known altitudes
and maybe check those against Google before depending
on the stats. (Though I don't know what one depends on
them for. Why does anyone care about altitude stats
except, maybe, when mountain climbing?)



On my last trip there, several years ago, I was climbing down Cadillac
Mountain to catch the sunrise. My leg collapsed, I sat down and skidded,
using my tripod to give me more friction. Luckily I stopped a few yards
from the drop-off.

After I found I wasn't broken, I took this to see if the camera worked.
https://www.dropbox.com/s/pxd5l6bb13low74/Sunrise%20in%20Acadia.jpg?dl=0

--
PeterN
 




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