Part 2 ~ Matrice 600 vs Inspire 2 vs Mavic 2 Pro

Continuing the two part series on Survey Mapping with various drones and cameras.

If you missed Part 1 of the first drone comparison of the Mavic 2 Pro and Inspire 2 you can read it here: https://conta.cc/2Y6fgxh

The Project Site (13.5 acres)

I had the opportunity this past week to utilize three of my favorite drones on the same project site for a side by side comparison in a real world scenario.

Nine (9) GCPs were set using GPS methods. GPS methods were used because this is what most GCPs are set with by the surveying community primarily due to budget and time constraints.

Time is money!

Five (5) of the nine were used to constrain the survey model to with Metashape Pro as shown by the red triangles. Four (4) were used as checkpoints to check the Root Mean Square Errors (RMSE) to the standards set by the American Society for Photogrammetry and Remote Sensing (ASPRS).

The results of the test below verify that the Matrice 600 meets the ASPRS at 95% Confidence Level Horizontal class of 0.63cm and the Vertical class of 1-cm and the 1.25cm H / 2.5cm V classes for the Inspire 2 and Mavic 2 Pro based upon the number of GCPs set for this project.
This project site was flown with the Matrice 600, Inspire 2 and Mavic 2 Pro.
´╗┐The side by side results are shown below as processed through Metashape Pro.
Matrice 600 ~ Phaseone Camera
(55mm) 50mp
8280 x 6208 (px)
Sensor 44.0mm x 33.0mm
AGL 350'
FOV: (w) 279', (h) 210'
Neat area: (w) 195', (h) 84'
Speed: 10.7 mph
Capture rate 4 sec.
GSD: 1.03 cm
Flight time: 5 min
Flight app: GSP
# of images: 70
40% side, 70% front






Second image is with all control points as GCPs. Not much difference than using 5 GCPs above which means that the Phaseone Camera captures awesome images for survey mapping.

Mavic 2 Pro

(10.26mm) 20mp
5472 x 3648 (px)
Sensor 13.2mm x 8.8mm
AGL 150'
FOV: (w) 193', (h) 129'
Neat area: (w) 77', (h) 39'
Speed: 8.8 mph
Capture rate 3 sec.
GSD: 1.08 cm
Flight time: 11 min
Flight app: Litchi
# of images: 220
60% side, 70% front
Below are all control points turned on for GCPs.
Inspire 2 ~ x5s

(15mm) 20mp
5280 x 3956 (px)
Sensor 17.3mm x 13.0 mm
AGL 200'
FOV: (w) 231', (h) 173'
Neat area: (w) 92'), (h) 52'
Speed 11.8 mph
Capture rate 3 sec.
GSD 1.33 cm
Flight time: 8 min
Flight app: Litchi
# of images: 147
60% side, 70% front
Below are all control points turned on for GCPs.
From the above results, the Matrice 600 with the Phaseone $30k medium format camera does produce awesome results. I use the M600 for survey mapping that will be processed through Summit Evolution software which is a high dollar application as well. EPS Group has a full scale photogrammetry department that is run by Richard a certified photogrammetrist. I am fortunate to be able to work closely with Richard who has taught me a lot about photogrammetry. Not everyone gets these opportunities which is why I share what I have learned in these email posts and books I have written.

Metashape Pro is used to process the Inspire 2 and Mavic 2 Pro imagery.

The Mavic 2 Pro list for about $2000 and the Inspire 2 list for $5000 and up.

I really like my Inspire 2. It does really well in windy conditions and is a workhorse.

The Mavic 2 Pro is a really good option for starting out with survey mapping that will produce survey grade mapping if done right. The right number of GCPs in the right location is the trick.
Conclusion

For larger sites and fewer GCPs, the Matrice 600 with the Phaseone camera is the way to go if you can afford it. Drone, gimbal and camera are around $50k. For this project site all 9 GCPs were utilized for control. The 3D survey mapping was completed by the EPS Group photogrammetry department for the final deliverable.

The Inspire 2 does really well and is capable of producing survey mapping to acceptable accuracies. SMMS Inspire 2 was used for the above flight. The cost of this drone setup was $7,500.

The Mavic 2 Pro holds its own however it needs more GCPs to improve on the accuracies for the project site above.

"Not all drones/cameras are the same nor do they produce the same results."

First determine what your deliverables need to be, then select a camera that will meet the accuracy needed for the deliverables and finally select a drone that will carry the required camera.

The costs of the drone, camera, time and GPS equipment needed to set the required number of GCPs all factor into the cost/benefit ratio for just which drone system will benefit your survey mapping operation.

As nice as the Matrice 600 with Phaseone camera is for survey mapping, it doesn't have video capabilities. The Inspire 2, Mavic 2 Pro and Zoom drones are perfect for capturing videos and oblique imagery.

Every survey operation at a minimum needs two drones. A high end one for survey mapping and one for videos.
If you like the information provided above and would like to see more in future email posts, then consider purchasing some of my books to help support the effort. As all of you know, computer hardware, software and drones costs money. I put 100% of my book sales back into the business to write more books, buy drones to test and so forth.

Thank you all that have supported this effort. It is greatly appreciated.
Unique Surveying Math and Mapping Book Series,
Training and Reference Material Study Guides.

Open Survey Mapping Study Guide here .

Open Surveying Mathematics Study Guide here .
Surveying Mathematics Made Simple Book Series.

One of the biggest hurdles to get through on the FS and PS exams is the surveying mathematics. It takes dedication to study and practice to master the math needed for the exam and throughout your surveying career. 

This series of books will provide the necessary tools and step-by-step processes to bring it all together.

Each book in this series will build upon the last one to help you to become a true surveying professional. 
Survey Mapping Made Simple Book Series.

Almost anyone can learn to fly a drone. Not everyone can truly master the skills that are required to use a drone for aerial survey mapping and get professional results. 

This series of books will provide the necessary tools and step-by-step processes to bring it all together.

Each book in this series will build upon the last one to help you to become a true professional remote pilot. 
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