Request #1:
DJI Terra, when processing the L2 Lidar sensor data, there are times that it produces noisey data in localized areas. It can be delt with, but the software really needs a noise reduction filter. General premise of the filter is to search for neighouring points within a distance, if little to no points are found, those said point is removed. This should get rid of about 90% of bad data.  
The fact that these nosiy areas exist, messes with the ground classification. So the noise reduction filter needs to be processed BEFORE any ground classification takes place!

Before anyone asks. YES! the sensor is calibrated and the IMU calibration is enabled for each flight.



Request #2:

Terra needs option to process a orthomosiac image when using the L2 Sensor and processing a colourized LiDAR flight. It has all the necessary tools and information to do it, but its not an option. If you got a DEM, and Images, its pretty easy to create an Orthomosaic

For the noise the feature name is optimize point cloud accuracy. It works pretty well.
Do not use the smooth point cloud feature, it is for other purposes.

The calibration is meant for colorizing the point cloud from RGB camera data, kind of alignment. Nothing to do with the noise.

For the orthomosaic, having a colorized point cloud or not won't change anything.
It won't bring depth map and geo referencing for each picture.
At best there could be an option to use the L2 point cloud, for the mesh/DEM step, but why ? It works already in visible reconstruction from point cloud generated from pictures.

DJI must better spend time on solving custom geoid, which is an available function since the beginning of L1 but still not working as it should.

LV_Forestry Posted at 10-23 13:24
For the noise the feature name is optimize point cloud accuracy. It works pretty well.
Do not use the smooth point cloud feature, it is for other purposes.

Your wrong on the calibration. It does help with "layering" effect of the point cloud. Which is somewhat the issue I have having.

It does need an option to create an orthomosaic. You can't create a Dem without a point cloud, and you can't create an orthomosaic without a DEM. You can Trust me, I've been doing this for years.

But I do agree it needs a option to enter custom Geoids.

F055y Posted at 10-23 15:08
Your wrong on the calibration. It does help with "layering" effect of the point cloud. Which is somewhat the issue I have having.

It does need an option to create an orthomosaic. You can't create a Dem without a point cloud, and you can't create an orthomosaic without a DEM. You can Trust me, I've been doing this for years.

This is what is implied in the manual but it is just another marketing argument. Calibrating the IMU in flight is helping with this.

For the point cloud yes that is what I wrote in last reply, we could have the option of using it to generate a DEM. Terra is quite good for 2D stitching the picture. If the software was fully functional we could expect them to work on this kind of additional feature. But that is far from being the case.

Metashape offers this function, and i agree that it is very useful when the photogrammetry point cloud is too sparse. But it is professional software. Terra is for now just a toy, an interface to generate LAS before sending it to more advanced application.

LV_Forestry Posted at 10-23 20:34
This is what is implied in the manual but it is just another marketing argument. Calibrating the IMU in flight is helping with this.

For the point cloud yes that is what I wrote in last reply, we could have the option of using it to generate a DEM. Terra is quite good for 2D stitching the picture. If the software was fully functional we could expect them to work on this kind of additional feature. But that is far from being the case.

I use Metashape almost Daily. Great Software! I would like to avoid the step of having to bring in the Terra DEM, and images in Metashape to create the Orthomosaic, when Terra has the capability to do it.

I do agree that Terra is much like a "toy". Its in its infancy, but it has potential if DJI Engineers take it more seriously, and consult with actual surveyors.