Mapping and GIS Solutions Community

I'm a new Trimble Catalyst user, so this may well be something I am doing wrong.

I'm based in the UK using Catalyst DA1 with UAV Ground Control to collect GCP's.

I have been testing out the DA1, in free mode.

Regardless of GNSS configuration in TMM, when points are collected in UAV GC, the export file does not have a value in the 'EPSG Code' field.

AntennaHeight(m), MSLHeight(m) and MSLHeightAtGround(m) are also empty.

I have tried GNSS correction set to Auto and also set a specific frame (ETRF2000 R05), with the same result.

Is this correct?

In was expecting an EPSG code to be output, from the information given in this article:

Defining a reference datum 

Thanks

Jason

EDIT: I tried again today using the precision subscription and EPSG code is output to the file, so I guess it was due to using the 'Catalyst Free' subscription.

Hi Jason,

the scenario you describe sounds correct - so as designed.

A Free Catalyst subscription results in a raw (uncorrected) GNSS position. 

Any other subscription will apply correction data which results in a corrected position.

For TMM/ UAV etc correction data also contains datum transformations, geoid handling etc. So all this 'position enhancements' come under the umbrella of corrections.

While you are running in free mode those corrections don't get applied.

To verify this feel free to reach out tpsdk-catalyst-ug@trimble.com">to us; we can provide a temporal subscription so you can check what works best for you.

Regards
Nico

Thanks Nico, makes sense.

Could something be added to the documentation to explain this?

https://help.trimblegeospatial.com/TMM/Home.htm

https://help.trimblegeospatial.com/UAVGC/Home.htm

Hi Jason,

Thanks for the suggestion to update the documentation, I can confirm that this has now been done.

Regards,

Mark.