North Group Support Center > Help Desk > Knowledgebase

Example of PPK for photogrammetry in Croatia


This is a real example of PPK for photogrammetry in Croatia


The RTKite is used without RTK, only RAW data are used. So, there are not connections to Base or Cors. Only one RTKite unit with the PhotoKit.


The camera is a Sony A6000




1)      The RTKite was setup in Drone UHF mode (without UHF modem connected) because is the most quick mode to initialize.


2)      Pressed the Push-Button for start to log file RAW (you can also configure to Start Log Automatically)


3)      Flight with photos. 10 min flight on the 50m AGL with 4m/s speed.


4)      Landed and stopped to record file RAW by pressing again the button.


The files generated


1)      PPS_FILE_10052017_0826_0001.NOR

This is the RAW file. In this file are the RAW observations and events for each photo. This is the only file that will be post-processed.

2)      PPS_FILE_10052017_0826_0001.LOG

This file was created because the “Extra Log” setting was enabled in the App. This file is not used. But you can check that GPS is in SPP mode (not RTK), by watching field 4 (value 16)

3)      PPS_FILE_10052017_0826_0001.TXT

This file is also not used. Here are the coordinates of each photo in real-time, so, with SPP accuracy (not RTK). Field 2 (value 16)


The Work in desktop, the “post” side


In folder Rinex, these are the files generated from PPS_FILE_10052017_0826_0001.NOR using “RTKLIB 2.43 by NORTH”





Then, we need Rinex files from a near permanent station for our time interval. These files are:






The results



This file was created by the process of RTKLIB, here are the positions of drone during the flight. The field Q=1, so accuracy of each position is FIX.  In this file, you can see also the error (in meters) for each position. This file is not used. The coordinates of photos are in the "_events.pos" file



This file created by the process of RTKLIB is our end goal. It has the same format than above. In this file are the coordinates  of 159 photos taken from the camera. The field Q=1, so accuracy of each position is FIX and each error is computed.



In Red is the track of flight, in Green the coordinates of photos


Full files here


Related articles How to Post Processing Kinematic (PPK) for Photogrammetry
TXT File Format
LOG File Format
There are any API for access the content of SD Card by cable?
Article details
Article ID: 23
Category: RTKITE FAQ

« Go back

Powered by Help Desk Software HESK, in partnership with SysAid Technologies