How to process thermal datasets in Pix4Dmapper

Because of the sensor's low resolution, we recommend a high overlap (90%) with all thermal dataset. For more information on the optimal flight plan to capture thermal images: 202755349.

Create a thermal project
Visualize your thermal outputs
Process dataset with both thermal and RGB imagery

Create a thermal project

1. Create a new project. For more information: 115002472026,
For nadir dataset with accurate image geolocation, select the processing template Thermal Camera.

Note: For projects created using the senseFly ThermoMAP camera, the processing template ThermoMAP Camera should be used.
For oblique dataset or nadir dataset without image geolocation, it is recommended to use the 3D Models processing template.

2. Ensure that the Pixel Size and the Focal Length values are correctly set: in the Main Menu, click Project > Image Properties Editor... and on the section Selected Camera Model, click Edit... For more information: 210140783.
For step by step instructions about how to modify the camera model: 202560169.

3. On the Processing bar, click Start to start the processing. The thermal index map will be generated during Step 3. DSM, Orthomosaic and Index.

Visualize your thermal outputs

To visualize the thermal Index Map in the Index Calculator:

1. Click View > Index Calculator to open the Index Calculator 

2. In the section Index Map of the sidebar, select the band containing the thermal data.

Note: For projects created using the senseFly ThermoMAP camera, the temperature [°C or °F] index should be used to obtain absolute temperature index maps.
For projects created with Zenmuse XTR or FLIR Vue Pro R radiometric cameras and if RJPG (radiometric .jpg) imagery is used, the absolute temperature is obtained directly from the band.

3. (optional) In the section Color Map and Prescription of the sidebar, increase the number of classes to 32 and from the drop-down list choose Equal Spacing204631495.

To visualize the 3D Textured Mesh in the rayCloud:

1. If you use the Thermal Camera processing template and that the 3D Textured Mesh output is desired, in the Menu bar click Process > Generate 3D Textured Mesh. For more information: 202557899.

2. Click View > rayCloud, to open the rayCloud and load the 3D Textured Mesh by ticking the Triangle Mesh box in the Layers section of the left sidebar. For more information: 202558079.

2. (optional) In the Triangle Meshes layer of the left sidebar, select Display Properties and change the Shader to Thermal.

Process dataset with both thermal and RGB imagery

1. Process Step 1. Initial Processing for the thermal dataset following the instructions above.

2. Process Step 1. Initial Processing for the RGB dataset in another project. 

4. Merge the RGB and the thermal projects. For more information about merging project: 202558529.

5. Click Process > Processing Options. In 2. Point Cloud and Mesh, under the tab Advanced, make sure that for the Point Cloud and Mesh Geometry image groups, Thermal IR is unchecked and that group1 is checked. Ensure that for the Mesh Texture image group, Thermal IR is checked and group1 is unchecked. For more information: 204644369.

Information: This last step ensures that the Point Cloud will be generated from the RGB images, the Mesh Geometry will be created from this RGB point cloud and that the texturing will be done using the thermal imagery.


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