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Photogrammetry Options

The platform integrates two industry-leading photogrammetry processing engines :

  • Pix4D
  • Agisoft Metashape

These engines are built in the processing workflow and leverage the cloud-computing capacity.

1. What kind of dataset can I process with each of these engines ?

Currently :

  • Select Pix4D for  RGB, Multispectral, and Thermal datasets
  • Select Agisoft for RGB datasets only

You can browse the supported sensors here.

2. What happens if I upload a dataset that is not compatible ?

You may need to use occasionally other categories of datasets than your usual one. The category of data is detected during the upload process. In case that you upload a data set that is not compatible with the default photogrammetry engine, the user interface will prompt you for overriding this default setting to the appropriate alternative.

3. Preferred photogrammetry engine options

According to your business, you may require only one engine.  It is possible to define the preferred Photogrammetry Engine as a preset for the Company (with all its Sites) or within a certain Site

4. How do I create photogrammetry presets ?

4.1 For an existing Site only

Open an existing Site and the press the Information button in top bar so as to open the right panel displaying the site general information. Scroll down to the Photogrammetry Presets section and unfold it:

Select what shall be the default setting for the next processing (additional surveys) within this Site. Press Create button to save presets :

This will result in a confirmation message displayed :

4.2 For an entire Company

Managers have administration rights allowing to define the settings that will apply across all managed Sites, per Company. From the left panel, press Administration button :

Press Companies management button and then select the company in the list for which you want to adjust the photogrammetry default settings.

Click then on Photogrammetry presets tab. Adjust the settings (description given at section 5.1.1) and then Create preset.

5. What are the different photogrammetry services and options ?

5.1 Pix4D Options

5.1.1 Execution mode : Self-service or Advanced

  • Self-service option shall be used to get automated results from the engine without the assistance of a Delair production member.
  • Advanced option will notify the Delair production staff and photogrammetry will be handled then delivered in the platform with their assistance and quality control.

5.1.2 Custom Settings

Selecting both Pix4D and Custom allows to set below parameters :

  • Generate Light Reflectance Map : for Agriculture & Forestry projects.
  • Keypoints image scale : this changes the scale of the image used to find matching features. Lower (1/2, 1/4) scales will allow projects to map faster, but with lower accuracy.
  • Calibration method : this allows for the user to declare the usage of a highly accurate geolocation and orientation system (E.g. flying with RTK). Do not select this if you are unsure, as the resultant models are likely to fail.
  • Point cloud image scale : This defines the scale of the images at which additional 3D points are computed. Lower (1/8, 1/4) scales produce faster, less dense clouds.
  • Point cloud density : This parameter defines the density of the point cloud vs. the pixel density of the original images. The low settings produces faster, less dense clouds.
  • Point cloud minimum matches : The minimum number of matches per 3D point represents the minimum number of valid re-projections of this 3D point to the images.
  • DSM method : This defines the method that is used for the Raster DSM generation. The method will affect the processing time and the quality of the results.
  • Orthomosaic resolution : This allows for the selection of a custom resolution in terms of GSD.
  • Mesh resolution : This allows for the selection of a mesh resolution.

5.2 Agisoft Metashape Options

  • Self-Service and Advanced photogrammetry options are both available as with Pix4D.
  • Custom Settings are currently not available with Agisoft Metashape option.

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