[talk-ph] video mapping

[Ervin Malicdem]

I personally use a GPS - enabled camera in video mode to which it syncs via
GPS time. While the GPX trace generated by the GPS device is on of course
on GPS time as well making them synchronized.

Ervin Malicdem
Schadow1 Expeditions - A Filipino must not be a stranger to his own
motherland.
http://www.s1expeditions.com
On Sep 27, 2013 11:05 AM, "Mark Cupitt" <markcupitt at gmail.com> wrote:

> when i was flying aerials using a video, we used to sync on the ground by
> letting the gps stabilize then marking an event that saved the exact time
> and we also flashed a strobe at the camera so that "start" point could be
> determined. the camera time and time in the file could be  compared at
> those two events and a difference established.
>
> given the relatively slow speeds of a vehicle, you could probably get
> quite close by covering the lens of the camera, then saving a way piont,
> assuming the timestamp is saved as well, then just remove the lens cover at
> the same and get going.
>
> of course, you have to adjust for the time differences manually or post
> process the gox file. we had some sppcialized software to do that, but i do
> not have it any more, unfortunately. maybe there is something in one of the
> newer apps that can do that.
>
> setting the time on the camera and comparing the difference to the gps
> time would also work, slightly lower tech option.
>
> neither of these are "precision" options, but would give a little better
> accuracy, if you had trouble syncing the camera time with the gps time.
>
> of course if you want to get really high tech, stick a camera out each
> side of the car, sync both cameras to the gps and just drive slowly. kind
> of like google philippines style.
>
> i do recall doimg some research on video cameras where they could actually
> sync by an infrared signal or connector  but i never followed through
> On Sep 27, 2013 10:23 AM, "Leonard Soriano" <banito_pinoy at yahoo.com>
> wrote:
>
>> In synchronizing a GPS and digital camera before going out to the field,
>>  I do this manually. I set the time of the camera as sync as possible with
>> the GPS.
>>
>> Probably it might be the same process for video cameras. Video mapping
>> might require a more perfect timing because since you are moving relatively
>> fast, a difference in time between the two hardware could result to a
>> mismatch of GPS coordinate and the captured video.
>>
>> --bunny
>>
>>
>>   ------------------------------
>>  *From:* Jim Morgan <jim at datalude.com>
>> *To:* talk-ph at openstreetmap.org
>> *Sent:* Thursday, 26 September 2013 10:49 AM
>> *Subject:* Re: [talk-ph] video mapping
>>
>> maning sambale wrote, On Wednesday, 25 September, 2013 11:02 PM:
>> > Nice article by Ervin on video mapping.
>> > http://www.s1expeditions.com/2013/09/102-videomapping.html?m=1
>> > I didnt know its possible to add gps coordinates as subtitles in a
>> video.
>>
>> That is interesting. I'd probably seen that GPSbabel could export in SRT
>> format, but it didn't occur to me that this was subtitles as it was out of
>> context. Question: how do you get the timing of the video and GPX to
>> sychronise? For a start you'd have to make sure the video recording device
>> and the gpx recording device had their time set the same. Do you sync them
>> up just by switching them on at the same time, or is there a way to embed
>> the time in the video? GPX has time information included of course.
>>
>> Jim
>>
>> --
>>
>>     datalude: information security
>>     e: jim at datalude.com
>>     Philippines: +63 2 403 1311 / mob: +63 917 849 3939
>>     Hong Kong: +852 5125 3392
>>     w: http://www.datalude.com/
>>
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