Uploading a PPK Survey with Quantum Trinity F90+ Drone


If you plan missions and fly with a Quantum Trinity F90+ drone, you can access Propeller's high-accuracy survey processing workflow. This handles both the PPK correction of your drone's GPS observations and the processing of your images to create a 3D model of your site.

Note: If you want to process data with our standard dataset workflow, follow our How to Create a New Dataset article for instructions. 

This article describes how to upload data captured with the Quantum Trinity F90+. If you fly a WingtraOne, please review our step-by-step instructions on uploading a PPK survey for a WingtraOne dataset.  If you fly a DJI Phantom 4 RTK, please review the step-by-step instructions for uploading a PPK dataset.

Required Inputs 

1. One or more drone flights with at least 10 JPEG images each.

2. Two GPS observation data files from each drone flight: 

  • FlyLog_Number.ubx 
  • FlyLog_Number_PayloadTagging.prop

3. One AeroPoint flight that has not been submitted for processing. You will complete the processing step as part of your dataset upload.

If you already processed your AeroPoint flight, you need to duplicate it in your AeroPoints dashboard to produce an unprocessed copy.

Before you start

Geotagging with QBase 3D

In most cases, if you use the Trinity F90+ PPK drone with Propeller AeroPoints, you do not need to use QBase 3D to geotag your images before uploading. You could proceed with Propeller’s PPK workflow. 

However, there are some situations where you would geotag images using Qbase 3D, including: 

  • You do not use AeroPoints.
  • You have your own base station.
  • You have only AeroPoint 1s and are not within the Propeller Corrections Network (PCN). 
  • You have only AeroPoint 1s and are on a local grid site.

Please discuss other situations with your assigned customer success engineer or Quantum Support. 

Data Upload

Make sure you have created a new site or know which site to which you want to add your survey by choosing it in the dropdown menu.

Selecting photos for upload

Access the SD card to download the drone flight data. 

The Trinity F90+ saves flight information in a Fly_FlightNumber.bin file.  This file is used in Qbase 3D to generate the .prop and .ubx files needed for PPK processing in Propeller.  Connect the drone to your computer using QBase 3D and the provided USB cable to download these files.  

Images are saved on the payload’s SD card and can be downloaded directly from the card by plugging it into your computer.  It’s recommended that you save the images and flight information files in the same folder, as shown below.

Generating PPK Files in QBase 3D

If you have already geotagged in Qbase 3D, additional image files will be created and placed in the folder.  Please do NOT include these additional files when uploading using Propeller PPK. The only two files from the folder that should be uploaded with your images are Fly_FlightNumber.ubx and Flight_FlightNumber_PayloadTagging.prop.

The following video shows the steps to generate the .prop and .ubx files using QBase 3D.

 

Choose your drone flight data by dragging and dropping each flight onto your browser. 

Alternatively, you can select a folder containing all your flight folders by clicking “Choose a folder.”

Make sure to also upload the .prop and .ubx files generated in Qbase 3D.

Validation

Your photos are scanned and validated in the following four categories. Photos must pass these requirements to be properly processed.

Your file collection
Your drone
Individual images
PPK files
Minimum 10 images Drone camera is recommended Compatible geotag Files have the required metadata
Same aspect ratio PPK drone is registered Aspect ratio Files must be unique
Camera course alignment   Motion blur  
Single connected area   ISO  
    File name less than 255 characters  
    Minimum 8 megapixels  
    Files above size limit (75KB)  

 

Once the selected files have been validated, a map appears with the location of your photos and survey area. 


If any issues are detected with your submission, you will receive a warning with recommendations on how to proceed.


When all photos are displayed as expected, click NEXT to proceed.

Dataset details

Set the dataset name and capture date. Adding the capture date and time will place each survey chronologically on the Timeline View feature. Click NEXT.

The date and time will default to the timestamp on the first uploaded picture.

Adding AeroPoint survey data

Next, submit an AeroPoint survey. You can choose between two options:

  • AeroPoints, or

  • AeroPoints and a .csv file

To learn more about submitting ground control, check out our article “Submitting Ground Control/Checkpoints with Your Survey Dataset.”


If you add a survey to an existing site, the site’s coordinate reference system will be displayed here.


Choose the AeroPoint survey from the list of available AeroPoint captures.

In order to submit PPK data, you must select an unprocessed AeroPoint survey from your AeroPoint captures. 

Those outlined in red are already processed but can be duplicated if selected.

Select processing method

There are a few ways to process data.

1. Propeller Corrections Network

This method uses the Propeller Corrections Network to obtain globally accurate coordinates.

From the dropdown, assign each AeroPoint in your survey as a Ground control point or checkpoint. You can also exclude it from your survey. 

The number of AeroPoints you select as ground control points versus checkpoints depends on the area and undulations covered by the survey. Typically, three AeroPoints (preferably 5) as ground control points and the remainder as checkpoints are sufficient.

2. Global Survey Benchmark

You will select an AeroPoint with a known location and enter its coordinates here. If you used the known point benchmark method to process your AeroPoint survey, be sure it is selected as a ground control point unless it is not in the survey area.

3. RINEX Upload

This method uses RINEX GNSS observation data from a base station within 40 km that covers the time period of the survey.

Comments about your GCPs

This is an optional box where you can provide more information regarding your GCPs to our Data Team. For example, it’s helpful to know if anything unusual happened during your survey, such as the AeroPoint was accidentally moved or destroyed during capture.

Outputs 

Elevation model filter

Elevation model filters remove undesired artifacts such as trees, buildings, equipment, and vehicles from the digital elevation model output. 

You can select No filter or from the other available filter settings as part of the output configuration.

We recommend using either the No Filter or Equipment filter and combining this tool with Terrain Cleanups to ensure you only remove items that would affect your measurements.  

Configure outputs

This is a list of the output files that will be produced as part of the final dataset. Files can be found on the Platform and downloaded from the Viewer.

Summary & Upload Progress

Dataset details

Please review your dataset for accuracy before you click SUBMIT.

1. Dataset details

General information about the dataset you are submitting, including:

  • Site name
  • Date and time flown
  • Total gigapixels and photos
  • Type of upload

2. Ground control

  • Type and number of GCPs and checkpoints

3. Processing outputs

  • Files included in the platform
  • Downloadable files

4. Quality assurance settings

This guides how many QA checks are made on your survey. Generally, the stricter the chosen QA, the longer the turnaround time.

5. Dataset credits

  • Total number of credits used to process your data 


I still can't do it!

We wrote these articles to equip you with everything you need to get the job done on your own, but we understand that sometimes this isn't sufficient.

If you're stuck, you can connect with our support team by clicking the support button on the top right corner of your user portal.