How to Export Images from SlantView for Pix4D

SlantRange images can be exported for processing in Pix4D using the export tools in SlantView

Keep in mind, the industry standard to generate native resolution stitched mosaics of agricultural image data, which is very prone to aliasing due to the repeating features in the images, is typically 80% overlap, resulting in 4x the flight time and 16x the raw data when compared to the flight parameters used for processing in SlantView.

The export tools referenced in this article are available in the free version of SlantView, known as SlantView Lite.

Step 1: Access SlantView

Log in into your SlantView account to begin the data export.


login

Step 2: Pix4D Export Option

Click Settings > Export options.

To export the images for multispectral processing:

  • In the Targeted section, check Pix4D.

To export the images for RGB processing:

  • In the Targeted section, check Pix4D.
  • Uncheck Convert pixel values to reflectance.
  • In the Export color bands dropdown, select Separately.
  • Check Keep RGB planes together.

Click OK.


Screen Shot 2020-04-24 at 6.04.59 PM


Step 3: Process the Dataset

Select Data > Process dataset then select the desired dataset folder. It may take a few minutes to scan the folder. Enter the GrowerField name, and Crop type. Select the Process pull down menu, choose Export images, and click OK. When finished, SlantView will create a new subfolder named Pix4D.

export_process

For RGB processing, copy or move all of the RGB images from the new Pix4D folder into a new folder to be used in the steps below. Note that the RGB images all have RGB in the file name.

Step 4: Open Pix4D

Open Pix4D and create a new project. Select Add Directories and navigate to the Pix4D folder created in Step 3 above. Click Next to begin importing the data. 

pix4d_open_folder

Step 5: Confirm Image Properties in Pix4D

After the import is complete, confirm the camera and image metadata is correct.

pix4d_image_import


Click Next for the next prompts to accept the defaults. Before finishing, unselect Start Processing Now to enter additional processing options.


Step 6: Set Processing Options for Sensors with or without a SlantRange Precision Navigation Module

Select Open Process > Processing Options. Next, enable Advanced in the bottom left and select Initial Processing > Calibration.

A) Without a SlantRange Precision Navigation Module

Calibration Method: Alternative

Camera Optimization

Internal Parameters Option: All Prior

External Parameters Optimization: All

pix4d_calibration_option_allprior

B) With a SlantRange Precision Navigation Module

Calibration Method: Accurate Geolocation and Orientation

Camera Optimization 

Internal Parameters Optimization: All Prior

External Parameters Optimization: Orientation

pix4d_calibration_option_alternative

Next, navigate to 3. DSM, Orthomosaic and Index > Index Calculator.

For multispectral processing, SlantView images are exported as reflectance and are already corrected so ensure each option for Radiometric Processing and Calibration is set to No Correction.


pix4d_index_options


Adjust other parameters and processing outputs as needed then process the data set. Please contact Pix4D for further assistance.