Alexey Dobrovolskiy
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  • Riga
  • Latvia
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Alexey Dobrovolskiy's Groups

Alexey Dobrovolskiy's Discussions

Droneshare support

Started this discussion. Last reply by Alexey Dobrovolskiy Sep 14, 2015. 1 Reply

Hi,how to reach Droneshare support? support@droneshare.com it seems not working.My problem:I have uploaded my mission to Droneshare…Continue

UAV regulations in international waters

Started Aug 31, 2015 0 Replies

Hi,Anybody has understanding how regulated drones usage in international waters (high seas)?Continue

 

Alexey Dobrovolskiy's Page

Latest Activity

Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI Phantom 3
"Will decide tomorrow :)"
Monday
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI Phantom 4
"Hi Mark, you can use overshot parameter in Photogrammetry tool. In our test we used 20m overshot but it seems that 10m will be enough. Regarding frame rate - it's not SDK or UgCS limitation. It's camera's own limit. It needs time to…"
Apr 12
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI A2
"yes, we loaded PX4 stack on to Iris."
Apr 12
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI A2
"There is a mistake in text, right link to data for A2 is http://ugcs.com/files/autopilot_precision/DJI-A2_test-flight.zip"
Apr 12
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI A2
"Regarding interpretation of our data. It's not a scientific work and we are not pretend to be absolutely true. We would like to give common picture of different autopilots behavior in automatic missions. We don't use any means to track…"
Apr 12
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI A2
"Results for 3DR Iris with PX4 firmware will be published tomorrow."
Apr 12
Alexey Dobrovolskiy replied to Curtis's discussion kml2ugcs in the group UgCS
"Hi Curtis, I can confirm that converter published on github was compatible with UgCS 2.10. But using your KML file I have found 2 bugs in converter. So please get latest version and enjoy."
Apr 10
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI Phantom 4
"Hi Mark, according specs Phantom 4 Pro can make still photos with 2s interval (http://www.dji.com/phantom-4-pro/info#specs). Inspire supports adaptive bank turns but it will miss part of waypoints and camera actions in these waypoints will not be…"
Apr 7
Alexey Dobrovolskiy replied to mark bellncula's discussion Pixhawk DJI ESC Issue
"Hi, here you can see our drones with Pixhawk + ArduCopter + DJI propulsion systems: https://youtu.be/zcUMGAYHno4 - DJI E1200 https://youtu.be/BJZMZL490Dg - DJI E310 All flights are fully automatics."
Apr 6
Alexey Dobrovolskiy replied to mark bellncula's discussion Pixhawk DJI ESC Issue
"Please check also MOT_SPIN_MIN value. By default it should be 0.15, you can increase it up to 0.30. I hope that your bird will not take-off with 30% of maximum thrust..."
Apr 5
Alexey Dobrovolskiy replied to mark bellncula's discussion Pixhawk DJI ESC Issue
"Hi, we have quite good experience with DJI propulsion systems with Pixhawk autopilot + ArduCopter firmware. ~25 copters and we are building 20 more for drone dances. Modern DJ ESC's don't support calibration, they have fixed working PWM…"
Apr 4
Alexey Dobrovolskiy replied to Curtis's discussion kml2ugcs in the group UgCS
"Hi, kml2ugcs converter (https://github.com/ugcs/converters/tree/master/kml2ugcs) was updated for 2.10. Please download latest version. Could you send me your sample of KML file with multiple polygons? Converter should create separate UgCS route for…"
Apr 4
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - MikroKopter Quad XL
"On this week we will publish results for A2, next will be 3DR Iris + PX4. Also we plan to test Iris + ArduCopter and quad with Dropix (pixhawk-compatible controller) + ArduCopter."
Apr 3
Alexey Dobrovolskiy replied to Nathan Harpster's discussion DJI PC Ground Station Seems to have stolen a figure right out of the UgCS manual? (3 Waypoint Mode Options) in the group UgCS
"Hmmm... I don't sure... It seems that our technical writer decided to make his life little bit easier..."
Mar 23
Alexey Dobrovolskiy replied to Jay Lewis's discussion Picture Overlap Percentage vs. Picture by Distance or Time interval in the group UgCS
"Nathan,with all "modern" DJI drones triggering by distance is emulated by ground station and requires constant and good link between ground station and drone. We decided to remove this function (camera trigger by distance) for all drones…"
Mar 23
Alexey Dobrovolskiy commented on Kristaps Brass's blog post Comparing Precision of Autopilots for Survey Missions - DJI Phantom 4
"Phantom 4 is much better than Naza. We already did that test and were surprised by results... We will test almost all our fleet, we have in operational condition at the moment: - Mikrokopter Quadro XL- Microdrones MD4-200- Kestrel Indago  - 3DR…"
Mar 19

Profile Information

Please tell us a bit about your UAV interest
I'm working for SPH Engineering - developer of UgCS - ground control software in Latvia.
Hometown:
Riga

Alexey Dobrovolskiy's Blog

Multiple drones and multiple operator support in U[g]CS

Posted on December 26, 2013 at 12:03am 2 Comments

 

Here is footage from software showing our software capability to simultaneously plan and execute mission with 3 different drones. Arducopter, Microdrone MD4-200 and Mikrokopter were used.

As we support at this moment Arducopter, Mikrocopter, ArDrone, Microdrone this demo can be interesting at least for professional users of…

Continue

Comment Wall (6 comments)

At 11:11am on April 17, 2015, Mike Governale said…

Thanks Alexey...  and good luck with your latvian farmers.

We carry a modified Canon PowerShot A810 (with standard lens) for the NDVI imagery.  We fly the same mission with another "unmodified" A810 to capture the 16 mp images.

We use Kolor's AutoPano Giga for stitching the images and process the NDVI with a plugin on ImageJ software.

For small crop acreage using our Y6 frames, we have found that 170feet altitude and 17mph speed provides the best stitching image resolutions desired while still leaving plenty of battery life for a safe return to home.  Our flight program triggers image captures by distance covered (and not triggered by way points) and we have flown this configuration in varying direction 20mph winds without loosing images because we exceeded the PowerShot A810 2.5 second refresh rate.

At some point, we hope to be able to afford using (and risking, if you know what I mean) modified cameras with a much larger sensor area (like a Sony Nex 6).  This would allow us to fly lower and/or faster with the same resolution.

We will stay with the cheaper cameras for now because satisfy requirements.  We are starting to test using our Skywalker's (1900 mm motorized gliders) for larger acreage surveys.  With these we have greater flight times, but the challenge is how to fly slow enough and low enough.

As you must know....   it is a continuous learning experience while trying to balance the costs, etc.

I hope this was somewhat helpful.

Mike G.

At 3:34pm on April 24, 2015, Alexey Dobrovolskiy said…

Thanks Mike,

could you tell also is GSD important for NDVI calculation? 

At 1:01pm on December 10, 2015, Ali said…

hi, there, I have seen a picture from power line inspection.

that was very clear and low noisy.

I want to know about your flight plan. the height, ortho imaging or oblique,

the distance from power line axis and the coverage of images(side coverage and along coverage). i tried that and have processed my data with pix4d but the result was not as the same as your pictures.

At 1:35pm on December 10, 2015, Alexey Dobrovolskiy said…

Hi,

as I remember it was ortho, altitude over line about 10 meters, distance from power line axis about 10 meters too.

And we make too much photos, processing time was about full day and night, but quality was perfect.

At 8:05am on December 11, 2015, Ali said…

thank you so much, by the way, can i ask you about your camera type.?

At 8:19am on December 11, 2015, Ali said…

sorry one more question.

i want to know about number of flight path in direction of power line.

i guess it must be two. with 10 meters distance from both sides of power line.

if its more please tell me.  

yours truly

Ali

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