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What does step 2. Point Cloud and Mesh do? and What does step 3. DSM Orthomosaic and Index do?

Hi, guys. I knew pix4d mapper have been image processed automatically by step and step. 

But I still want to learn more about What does step 2. Point Cloud and Mesh do? and What does step 3. DSM Orthomosaic and Index do?

What Photogrammetry principles do Step 2 and Step 3 separately use?

 

Thanks very much.

Best wishes.

Hi Guan,

In step 2 the automatic tie points created from step 1 are used for point cloud densification. The dense point Cloud is then used to generate a surface composed of triangles which is the mesh.

Step 3 creates a DSM based on the densified point cloud. The orthomosaic is also generated in this step taking the DSM and point cloud as input. The creation of the Orthomosaic is based on orthorectification. This method removes the perspective distortions from the images. You can have a look at this link: https://support.pix4d.com/hc/en-us/articles/115002495706-Processing-steps

Regards,

Momtanu