How to process Sequoia imagery

Imagery captured with Parrot Sequoia camera is automatically recognized by the software since the camera is in Pix4Dmapper camera database. Multispectral and RGB images of Sequoia should be processed in two different projects on Pix4D Desktop as detailed in the following sections:

   

Processing Sequoia multispectral imagery

 
Important: Multispectral and RGB images of Sequoia should be processed in two different projects on Pix4D Desktop.

1. Create a new project: 202557369.
2. Import all discrete band imagery (green, red, rededge and NIR imagery) from the flight. This includes the images of the calibration target.
3. In the Edit Camera Model window, ensure the Global Shutter model is selected: 202560169.
4. Choose the Ag Multispectral processing template: 204619819.
5. The radiometric calibration target data will be used automatically if the following conditions are all satisfied:

    • Version 2.2 or newer of the Pix4D desktop software is used.
    • Firmware version 1.1 or newer of Sequoia is used.
    • The calibration images were taken by using the Calibrate button in the settings of Sequoia. This can be done either by connecting to Sequoia via wifi to change the settings (see the Sequoia user manual) or via the eMotion software if the Sequoia is used with a senseFly drone. 

6. If the radiometric calibration target data is not detected automatically, this process can still be done manually: 203891879. In this case, it is possible to disable the images of the calibration target in the Image Properties Editor in order to remove them from the reconstruction.
7. In both cases, if a radiometric calibration target is used, it is recommended to make sure that the radiometric target data is taken into account by ensuring the symbol in the Processing Options is a green checkmark: 203891879.
8. Start processing.

Processing Sequoia RGB images

 
Important: RGB and Multispectral images of Sequoia should be processed in two different projects on Pix4D Desktop.

1. Create a new project: 202557369.
2. Import all the RGB images in the same project.
3. If the flight plan is linear, ensure the Linear Rolling Shutter model is selected: 208460436.
4. Choose the Ag RGB processing template: 204619819.
5. Start processing.

Processing Sequoia+ with its targetless radiometric calibration

 
Note: Targetless calibration with Parrot Sequoia+ is now available, starting with Pix4D Desktop 4.2.25.

The usage of a radiometric calibration target is not necessary with the targetless radiometric calibration of Parrot's Sequoia+. However, in order to use the targetless radiometric calibration of Sequoia+, the file sequoia_therm.dat is required. This file is generated automatically for each flight, is unique to each Sequoia+ and can be found for each set of images in the folder where the images are stored during the acquisition mission.

 
Important: The file sequoia_therm.dat, is generated by Sequoia+ and must be stored in the same folder as the original images.

To process a project with Sequoia+:

1. Create a new Pix4D Desktop project: 202557369.
2. Import your multispectral images, i.e. Green, Red, Red Edge, and NIR.
3. Click Next.
4. Select the Ag Multispectral processing template: 204619819.
5. Select the radiometric correction according to the lighting conditions when the images were captured: 203891879.

5.1. Camera, Sun Irradiance and Sun angle for clear skies
5.2. Camera and Sun Irradiance for overcast skies.

6. Start processing.

 
Information: Pix4D Cloud does not support targetless radiometric calibration at this time.
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