[Qgis-user] R: Android Camera App with compass bearing

Wed Nov 5 07:47:41 PST 2014

Hi

As I have both sw installed in my phone, i shot a pic and I tested these 2
sw, reading the exif data with an online reader:

Geopaparazzi:

GPS

GPS Latitude Ref North

GPS Latitude 45.543404 degrees

GPS Longitude Ref East

GPS Longitude 8.072008 degrees

GPS Altitude 419 m

GPS Time Stamp 15:13:20

GPS Img Direction 187.56

GPS Date Stamp 2014:11:05

GPS Essentials:

GPS

GPS Latitude Ref North

GPS Latitude 45.543367 degrees

GPS Longitude Ref East

GPS Longitude 8.072114 degrees

GPS Altitude Ref Above Sea Level

GPS Altitude 368.3999938 m

GPS Speed Ref km/h

GPS Speed 0.071999998

GPS Date Stamp 2014:11:05

The only problem is where to find images in the phone directories

Ciao

Emanuele

Da: qgis-user-bounces at lists.osgeo.org
[mailto:qgis-user-bounces at lists.osgeo.org] Per conto di Randal Hale
Inviato: mercoledì 5 novembre 2014 14:57
A: qgis-user at lists.osgeo.org; zoltans at geograph.co.za
Oggetto: Re: [Qgis-user] Android Camera App with compass bearing

Hopefully this isn't going too off topic - so last year found me in the
Caribbean working on an addressing project. 

I ended up using the Fulcrum app (not free) but it's really really good. I
used it in conjunction with QGIS and PostGIS. Everything is stored in the
"cloud" and you can download it in just about any format. 

Take a look at this: http://fulcrumapp.com/blog/viewing-photo-metadata/ it
seems as though it now is collecting direction (I need to go test this). 

Randy

On 11/05/2014 08:39 AM, Zoltan Szecsei wrote:

Hi,
Thanks for the thought - but see orange text below: Does not write bearing
into EXIF fields.
Regards,
Zoltan

On 2014/11/05 12:17, Lene Fischer wrote:

GPS Essentials - App

Regards
Lene

-----Oprindelig meddelelse-----
Fra: qgis-user-bounces at lists.osgeo.org
[mailto:qgis-user-bounces at lists.osgeo.org] På vegne af Zoltan Szecsei
Sendt: 5. november 2014 07:02
Til: tech at wildintellect.com; qgis-user at lists.osgeo.org
Emne: Re: [Qgis-user] Android Camera App with compass bearing

Hi Alex/All,
Thanks for the thoughts - my comments interspersed with your.

Kind regards,
Zoltan

On 2014/11/04 23:17, Alex Mandel wrote:

On 11/04/2014 04:55 AM, Zoltan Szecsei wrote:

Hi,
I need to do a field trip and take some photos.
I've been googling around, but cannot find an app that will burn both 
GPS position _and compass bearing_ into either the image, or just the 
exif data for that image.

Anyone got any experience in this need?

Thanks & regards,
Zoltan

Maybe, http://geopaparazzi.github.io/geopaparazzi/
"georeferenced and orientated pictures"

And now my long rant before I remembered the above link...

I manually downloaded the latest version (newer than that on Play Store) and
it still does not record bearing - even though the app does have a bearing
tool.
I checked the website and recording bearing into EXIF is not even on the
developer's long wish-list I have emailed the developer, with a hope to at
least get it onto the wish-list.

GPS data is an on/off toggle on most Android devices. Bearing does 
appear possible according to the exif specs, but in practice is rare.
http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GPS.html
<http://www.sno.phy.queensu.ca/%7Ephil/exiftool/TagNames/GPS.html> 

Yes, I checked that last night too - TAGs 0x0017 and 0x0018 relate to
bearing info.

However I don't see any obvious apps for telling the phone you want to 
capture that. I'm also not sure all phones are capable of calculating 
bearing when not moving.

So my suggested work around would be a GPS Logging application of 
which there are several. Then you can pull the bearing calculation out 
after the fact, if it was while moving.

Sigh, nope.
(In my kind of) Field trip data collection (& photography) often involves
driving to a feature, leaning out the car window and taking a snap-shot, so
recording moving direction will not help at all.
Note that bearing accuracy is NOT that critical, it needs only to be
reasonably indicative.

If stationary, you might need to write your own app which lets users 
indicate which way they were facing when taking a picture. For someone 
who's made an Android application I don't think this is hard.
http://developer.android.com/guide/topics/sensors/sensors_overview.htm
l Indicates all version of Android support the Magentic sensor.

This example shows how to get the bearing from the API 
https://www.codeofaninja.com/2013/08/android-compass-code-example.html
So GPS+Orientation+Camera should be all required.

Yep, true, but the purpose of this thread is to see if this wheel has
already been invented :-)

Kinda busts my GPS logging idea, since the bearing information comes 
from a different sensor than the GPS it won't be in the NMEA strings 
even if you captured them.

What? You not 'hard core' enough to intercept the NMEA stream and insert
"bearing-on-the-fly" by back-calculating the incoming coords?
(Just pulling your leg - thanks for your interest in this topic :-) )

Thanks,
Alex

-- 

===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
GIS and Photogrammetric Services

P.O. Box 7, Muizenberg 7950, South Africa.

Mobile: +27-83-6004028
Fax:    +27-86-6115323     www.geograph.co.za
===========================================

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-- 
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
twitter:rjhale     http://about.me/rjhale
http://www.northrivergeographic.com/spatial-connect
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