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Applanix cloud-based global GNSS correction service in UltraNav

Case Studies
23 May 2024
UltraNav direct georeferencing solution

Applanix recently released a case study comparing the quality of its cloud-based global GNSS correction service, Applanix POSPac™ Post-Processed Trimble CenterPoint RTX® (PP-RTX), to traditional methods that use a base station for Single Base or SmartBase processing.

The study used data from a flight with the UltraCam Eagle 4.1 f120 digital aerial camera. It aimed to determine the absolute 3D accuracy of stereo image point measurements. This was accomplished using the IN-Fusion PP-RTX processing mode within Applanix POSPac MMS, the software used for GNSS/INS post-processing in our UltraNav flight management and direct georeferencing solution.

The findings indicate that the PP-RTX results are slightly superior and present a strong alternative to the traditional reliance on dedicated base stations or SmartBase solutions. This method has also been adopted in our own test flights due to its effectiveness.

The foundation on which these impressive results could be achieved is always a rock-solid camera geometry and high-quality camera calibration. Interested in how the geometric calibration of our UltraCam systems works? Michael Gruber, Vexcel Chief Scientist in Photogrammetry, explains in a short video here.

Key Advantages of the cloud-based GNSS correction services


  • Minimized administrative overhead and enhanced data consistency are achieved through the global coverage of PP-RTX, diminishing the need for reliance on traditional base stations
  • Prompt data processing: RTX correction data can be logged in real-time or acquired via an internet connection in Applanix POSPac shortly after the completion of a mission
  • No frame/datum doubts – PP-RTX utilizes latest ITRF frame
  • CM level accuracy
  • No baseline restriction; or size of AOI
  • Correction data logged in real time during the flight – no trajectory upload or internet connection required (only available for UltraNav v7)
PP-RTX is available through a subscription license, which can be purchased annually or at a discount for multi-year commitments.

Read the case study

FAQs about PP-RTX
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