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Data Processing Workflow

General description

The standard processing workflow is the same for GCP, RTK and PPK drone data processing.

It utilizes high quality processing methods that are specific to each vertical and includes automated GCP tagging, full quality check & the option of adding advanced analytics to your survey.

While not recommended, users may also process data without control, however, as GPS is typically limited to accuracy no better than ~1-5m, producing results substantially shifted from reality which will not align with any past or future surveys.

Processing GCP, PPK or RTK data requires the following steps:

  1. Image Import
  2. Add Ground Control Points
  3. Select “Standard”
  4. Assign Horizontal and Vertical Coordinate Reference System (CRS)
  5. Upload images
  6. Request for Analytics (if desired)

Note: for processing without control skip step 2

Step1 - Image Import

Login to your account.

Select the desired project.

On the bottom left, press on.

Upload, and click on New then Upload a new image dataset.

Press on browse files to locate the images saved on your computer and press Open, or drag the files into the upload area and then click Next.

Select Flight Date - The system will automatically read the exif data, geo-locate the files and select the appropriate project and flight date.

Flight Name can be used to identify the survey by something other than the flight date, such as a particular AOI (stockpile area, west pit, etc.)

If you have more flight images from the same survey, press on + Add more to add the remaining images.

Select WGS84 ellipsoid if you do not know what vertical datum your drone uses and if your are doing a PPK or RTK drone data processing. 

Select GM96 geoid if you do not know what vertical datum your drone uses and if your are not doing a PPK or RTK drone data processing.

The polygon boundary surrounding the image markers may be adjusted in order to exclude certain images from processing.

Note: The green polygon represents the existing project area to ensure your images are in the project zone boundary.

Once finished with defining what images should be processed click Next.

Ground Control Points

In order to ensure the highest accuracy processing possible, even in RTK/PPK situations, one or more GCPs is recommended as it can greatly increase accuracy

For this reason, during Standard Processing, the system will expect a GCP file even in RTK/PPK situations.

While we recommend that this protocol be followed, if no GCPs are available, you may upload our GCP template file.

Select both the “Advanced photogrammetry”&“Add ground control points” if the user does not wish to click their own GCPs and wants Delair to ensure it.

Add the GCP file dragging and dropping the file in the upload area, or press browse in order to select the file via the browser.

The file should be in .CSV or .TXT format, no header row and only delimited with a comma. The file must be in the following format:

  1. Name/reference of the GCP
  2. X coordinate
  3. Y coordinate
  4. Z value
  5. X/Y accuracy (optional)
  6. Z accuracy (optional)

Once the GCP file has been uploaded, verify that the x/y/z columns appear in the correct order.

Press on Edit CRS to select the projection of the GCPs.

*The GCP CRS will take into consideration the CRS selected at the project creation. It must be selected. If it is not the same, reconvert the GCP file to the same Project CRS and then follow step 2.

If the selected CRS and the GCP file coordinate system match, the GCPs should appear on the map as orange dots within the survey boundary.

If nothing appears, then it may be possible that the CRS is incorrect or the X and Y coordinates are reversed. 

To retry, deselect Add ground control points (GCP), fix the file, and then select Add ground control points (GCP) and try again.

Click on Launch Upload on the bottom right of the screen, then click finish. 

You will be taken to the homepage where the project has been created and the images will be uploaded to. Plug in your computer; Do not refresh, close the page until the upload has completely finished. 

If necessary the upload can be temporarily paused and resumed by utilizing the Pause button on the Projects page.

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