One of our first attempts on using BR2 for photogrammetry. Here we are in Santorini trying to scan a small sandy beach
10 Likes
@Othonas - Very nice! What software did you use to process the imagery?
Very Nice. Same as Rusty, I am curious of the software too. Do you have any control of where the photo is taken. Like geomarking?
Thanks Rusty and Oystein! We use Agisoft PhotoScan for generating the model. This was our first try and we didn’t use any geomarking. However we are working on a new project near Athens where we will use control points. The problem that we are trying to work around for now (as I mention in another post) is how we will get the gps position underwater.
4 Likes
I use https://www.pix4d.com/
What is nice about it is you can license it for a month only and compile all your 3d projects.
You will need a super computer though because it takes days to compile.
I cannot share results here because of NDA clauses…
That said results are comparable to the above.
1 Like
I am working on a similar projects.
I have a method for time tagging the images and then preprocessing the images to insert a georef in the exif header.
Can share if you are interested
2 Likes
There is a really good c++ library for exif in github:
1 Like
Alan,
I am working on a similar project for underwater mapping.
can you share the method you guys used to georef your images? I am using a surface GPS (lowrance) with a Gopro underwater.
regards
Luis
What’s your email address.
I can send you some details
Please send to luis.chavez@24marine.com
Hi BigAl
Can you share your method with me please? My email is john.fisher@cabezon.io I would greatly appreciate it. I did speak to the folks at pix4d and they recommended imaging with (2) GoPro 5 Black units for maximum overlap but nothing for GeoRef.
Thank you
John
Alan,
email receiver.
I have been struggling with exif installation, it need many extras to make it work.
I have found an alternative, exiftool
-
here a link for installation is a simple excecutable. and read the GPS log files straight from the GPS, I will see how is it go.
-
One more detail, the EXIFTOOL also has a GUI for the users like me who love User Grafics Interfaces.
As my action camera can not do timelipase photos, I have used this video FFMPEG tool to take frames out of the video, then I will change the timetag of them in order to match the GPS timetag.
I will launch the ROV with the camera soom at the marina, to see what do we get.
regards
Luis
Ok good luck
@luis.chavez, You can use the waterlinked or other acoustic positioning system to get the position data in the qgc/telemetry logs: GPS Positioning · GitBook
It’s even possible to set up lawnmower transects over polygons drawn on the map in QGC, and to trigger cameras at regular distance or time intervals, these features are not yet stable or supported though.
2 Likes
Thanks for the detailed explanation.
regards
Please send me some details to wwx2002@gmail.com.
Thank you
HRM
Hey there , this is Amit can you send me the details in my mail id
dashamit165@gmail.com