I spoke to someone from OpenMMS. The total cost of an OpenMMS system with the Livox MID40 LIDAR is around $23,500 USD, where 80-90% of the cost of the system is the APX-18 sensor and antennas.
I had hoped it would be a most a couple grand for the APX-18. I am told it is a “very good” sensor, but I don’t think we need the kind of accuracy that achieves.
If the APX-18 sensor could be replaced with a different GNSS+Inertial sensor, the system cost could be much less. They suggested I look in to this company and it seems like this product may offer promise there:
I haven’t found a price for that yet, but it seems like it will be much cheaper than the APX-18. Of course, someone would have to integrate it with the OpenMMS too.
Our big drone arrives next week and we will use it for photogrammetry, but I may see what we can get with the OpenRTK330 if its reasonably priced.