PPP Kinematic & Geotagging

Hi folks,

We recently conducted some aerial surveys using a single Reach M2. The collection of data went smoothly, as did the timestamps written directly to the RINEX files. We’re now looking to post-process the data using NRCan’s CSRS-PPP tool in kinematic mode, as there were no nearby base stations or CACS stations.

We would like to geotag our photos so that they can be used in photogrammetry, however, I’m at a loss as to how to geotag photos with data that has been post-processed using PPP kinematic. AFAIK, the PPP data products returned by NRCan will not preserve the timestamp information.

We appreciate any advice!

Cheers,
Adam

Hi Adam,

If you did the drone mapping with Reach M2, you need to post-process data in Emlid Studio. It will calculate precise coordinates for each image and geotag them. Here’s the workflow description.

NRCAN can be used to obtain precise base coordinates before post-processing the drone data. For this, you need to submit the log from the base to NRCAN static. Obtained coordinates should be used as base coordinates in Emlid Studio.

Hi Svetlana,

Thanks for your reply. In case you missed it, there were no base stations operating at the time of the survey. We only have the data from a single Emlid Reach M2 receiver.

This scenario does not appear to be covered in Emlid’s workflow.

Cheers,
Adam

Hi Adam,

Oh, I see. But the base data is necessary for drone data processing. CSRS-PPP tool supports kinematic mode, but timestamps can’t be processed there.

You can try to search for NTRIP services nearby. Many of them allow downloading raw data logs from their stations. They can take a fee, though. But then, you can use it as a base log and process your drone data in Emlid Studio.

Thanks Svetlana,

Unfortunately, this survey was done in the Canadian Arctic and the nearest base station was several hundred kilometres away.

To confirm, there is no way to geotag photos when using only a single Emlid Reach M2?

Regards,
Adam

Hi Adam,

Yes, you always need a base for it.