In Belgium everybody uses Belge 72 coordinate system. How can we properly import the RTK drone photos in 3Dsurvey, so that we will be able to take best advantage of drone's RTK gps?

Because a special grid transformation must be used between WGS84 and Belge 72 coordinate system, we must use this workflow:

Prerequisite steps - install additional free softwares:
a) Install cConvert tool for conversion between ETRS89 and Belgian Lambert 72:
https://common.ngi.be/static/cConvert.exe
b) Install Matlab MCR:
https://drive.google.com/file/d/0By8mtXeuby0wODVuRUpPMDQtZUU/view?usp=sharing
c) Download ExifExtractor_WGS.exe:
https://drive.google.com/file/d/1doJeP4T67YCeerw8EshG0C8o6iAsPfap/view?usp=sharing

Workflow for setting up the project:
1.) Load in the images and set up the project like this:

2.) Run Exif_Extractor_WGS84.exe click on Load RTK from Photos, and then save the txt file with ETRS Positions:

3.) Run cConvert app, and use the file exported from previous step as input, and use these settings:

4.) In 3Dsurvey click on Reimport in telemetry view:
(To get the telemetry window, click on Data/Telemetry in menu bar)

5) Select Other as data type, then click on Browse to load in the Belge 72 coordinates from cConvert, and set everything up lik this, and finally click on Reimport:

This will overwrite the XYZ values for telemetry and move the camera postition accordingly. Then just process the project normally.

2.) Run Exif_Extractor_WGS84.exe click on Load RTK from Photos, and then save the txt file with ETRS Positions:

Hi, I tried to import the images in the exttactor, but they do not appear there. It's written 0 images, so I could not proceed to extraction. Any clue why!
I want to replace the wgs coordinates with local coordinate systema coordinates!

Hi,

There is a new thing for shift grid in 2.18, Vid showed me once how to use it, once set to the right parameters you don't have to change it again. But I had to reinstall so i lost the settings. It is in a beta version for Belgium. I had help from Vid, he sure can help you also.

Thank you, Sofie! The thing is that in some part of the country we use a local coordinate system and we convert the wgs84 coordinates to it with a official  software from the government. I just need to find a way to export the exif data, replace the coordinates with the local and reimport into 3dsurvey.
Greetings!

Hi Ivan,

For your application I recommend you use BR's exif extractor. It is free and you can downlaod it here:
https://www.br-software.com/extracter.html