Tutorial

Create Pix4D Project

  1. Before flight set the camera to shoot images in Tiff mode.
  2. Fly over the target area ensuring a high amount of overlap between images. Pix4D recommends 90% overlap in both forward and side directions
  3. Create a Pix4d project with the acquired images making sure that the correct lens for the camera you are using is selected, Pix4D can get this wrong.
  4. Set desired output options and begin processing

image1a 

Generate actual RBFO values

  1. Set camera to Radiometric JPEG mode and take an image.
  2. Download ExifTool http://www.sno.phy.queensu.ca/~phil/exiftool/
  3. Extract ExifTool.exe and drag and drop jpeg onto executable. ExifTool will display all exif data for that image. Record “Planck R1”, “Planck B”, “Planck F” and “Planck O” values
  4. Use the calculator below (RBFO From Exiftool) to generate actual R, B, F, O, K1 and K2 values

 

 

RBFO From Exiftool (Not Camera)

Environmental Data

Test Area

Please enter a raw value and then run the test to see if the correct outputs are produced.

Generate Thermal Mosaic

  1. Make sure the Pix4d project created earlier is closed and open its project file (.p4d) in notepad
  2. Do a find for <radiometricNormalization>true</radiometricNormalization> and replace with <radiometricNormalization>false</radiometricNormalization> Do this for all occurrences within the file
  3. Save and close the .p4d file and double click on it to open the pix4d project again
  4. Click on “Index Calculator” on the left navigation bar
  5. Generate the Reflectance Map (even if already generated)
  6. Click the Indices button
  7. Click “Add” to add a new index calculation
  8. Copy the formula provided previously in the section Generating RBFO values into the formula input area making sure to replace “RawValue” with the Reflectance band name provided
    image1
  9. Click ok twice to close both dialog windows and select your new Index map from the dropdown.
  10. Generate the Index Map.
  11. In the “Color Map and Prescription” section of the sidebar set the Number of Classes to 32 and select “Equal Spacing” from the dropdown list

 image2

You will be able to hover the mouse over the reflectance map and read off a temperature at any position.

Note: this temperature will be based on the Environmental Data entered in at the Generate RBFO Values stage and may not be absolutely accurate for all objects within the map.

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