I am working on my 1st Pix4d project. I am using a firefly 6 RTK drone with a Sony RX1 42mp camera. Our drone works in WGS 84 coordinates, and the vertical datum is WGS Ellipsoid in meters. I am working in in the USA in Wisconsin State Plane, Central Zone NAD83, US Survey feet. We are not using GCP’s because we have an RTK/PPK equipped drone. We currently use some bare earth LIDAR that our local government(s) have generated as our base topography. That data has a vertical datum of NAVD 88. When I run steps 1 and 2 and spot check the mesh generated, the elevation of the mesh seems to be roughly 100 feet lower than the LIDAR data. I have spoken to the drone folks to make sure I understood the output datum from the drone for the geo tags and I am pretty sure that I have that setup correctly. When I look at the elevation of the base station and the drone when it is sitting on the ground the elevation is about where I would expect it to be in comparison to the LIDAR data. When I generate the DSM/DTM will the data be at the same elevation as the mesh generated in step 2? I am hoping someone could help me with some trouble shooting steps as I am on my third try and I am not looking forward to all the point cloud editing I need to do to get the DSM/DTM to generate cleanly (only to find that the surface is off again).