Alexey Dobrovolskiy
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  • Riga
  • Latvia
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Alexey Dobrovolskiy's Groups

Alexey Dobrovolskiy's Discussions

WiFi 5Ghz telemetry module for Pixhawk

Started this discussion. Last reply by Alexey Dobrovolskiy Apr 22, 2018. 8 Replies

Hi,Anybody knows WiFi modules similar to very popular esp-07 or XBee WiFi, but for 5GHz? I mean modules compatible with Pixhawk, ie with UART port and necessary software support.Continue

Tags: 5Ghz, WiFi

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

d j commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"highly complicated and making no sense"
Sep 20
Alexey Dobrovolskiy commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"This URl is not for direct use in internet browser. It is programmatic API end point. Please use it as described in the post."
Sep 19
d j commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"BTW "Enter something (ArcticDEM for example) in the Name field, select External in the Type field, paste http://terrain.ugcs.com/arctic_dem_32m to Remote Source, then click Create http://terrain.ugcs.com/arctic_dem_32m 404 Not Found Code:…"
Sep 19
d j commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"If you publish low quality, blurred imaginery by Google and high resolution by others you get many supporters claiming Google maps are not fit for any navigation. You are right. Local communities must pay for high resolution updates in local maps…"
Sep 18
Alexey Dobrovolskiy commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"UgCS doesn't have "own" maps, we provide possibility to use different map sources - Google, Bing, OSM, corporate GIS systems etc. In all these screenshots you see Google imagery actually."
Sep 16
d j commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"follow-up "Hello, this post was about elevation data only. Not about map imagery.  Now sure how high resolution, highly reliable elevation data can be extracted if resource maps are of poor quality"
Sep 15
d j commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"ok, but some reasons you have mixed poor quality, low resolution  imaginery by Google Earth with better quality, higher resolution imaginery by UgCS. Could you rededit your post and insert the same quality, resolution imaginery for the same…"
Sep 15
Alexey Dobrovolskiy commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"Hello, this post was about elevation data only. Not about map imagery. "
Sep 15
d j commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"BTW In your presentation of elevation study you play with image resolutions. Could you set the same resolution for all images to let us verify the quality of input photogrammetry for the discussed region ?"
Sep 15
d j commented on Alexey Dobrovolskiy's blog post An easy way to use ArcticDEM data in UgCS
"Thank you Could you explain me why there is no snow at the North Pole, no snow in the Arctic Ocean vs. snowy South Pole I would like to study North Pole vs. South Pole vs. #climatechanges"
Sep 15
Alexey Dobrovolskiy replied to Harish's discussion Obstacle Avoidance sensor
"We tested different laser altimeters in different conditions - from desert to Greenland. Most reliable small altimeter what we found is WASP-200 LRF. But not only sun is problem for altimeters, they don't work reliable even in light fog. Now we…"
Sep 13
Alexey Dobrovolskiy posted a blog post

An easy way to use ArcticDEM data in UgCS

(image taken from https://www.pgc.umn.edu/data/arcticdem/)I would like to say a big thanks again to ArcticDEM project (https://www.pgc.umn.edu/data/arcticdem/). Using their elevation data it is possible to fly drones safely in parts of the globe not covered by…See More
Sep 12
Alexey Dobrovolskiy replied to Rotem Shfaim's discussion DJI A3 without Lightbridge in the group UgCS
"Hello Rotem, from on-board computer connected to the API port of DJI A3 it should be possible. It will be required development of custom ground station software to communicate with A3 via custom on-board computer, or in case of UgCS it is necessary…"
Aug 28
Alexey Dobrovolskiy replied to Rotem Shfaim's discussion DJI A3 without Lightbridge in the group UgCS
"Hello, no way. UgCS supports A3 with Lightbridge only."
Aug 27
Alexey Dobrovolskiy replied to Colin Murray's discussion Waypoint distance too close. Photometery Mission Error in the group UgCS
"Pedro, could you export and post here your mission? Or send it to our support. I found commend from some DJI guy here - https://github.com/dji-sdk/Mobile-SDK-iOS/issues/195 The two adjacent waypoints distance must be larger than the 0.5 meter…"
Aug 21
Alexey Dobrovolskiy commented on Kristaps Brass's blog post How We Flew A Winter Drone Show
"Hello, there is no mistake. All drones and ground station are in single WiFi network. Technically drones can communicate to each other, but they communicate with ground station only - to receive routes, commands and RTK corrections and to send…"
Jun 24

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

An easy way to use ArcticDEM data in UgCS

Posted on September 12, 2019 at 2:00pm 9 Comments

(image taken from https://www.pgc.umn.edu/data/arcticdem/)

I would like to say a big thanks again to ArcticDEM project (https://www.pgc.umn.edu/data/arcticdem/). Using their elevation data it is possible to fly drones…

Continue

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 (7 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

At 4:22pm on April 25, 2018, John Brady said…

Alexey, I do not have any trust worthy data for Greenland. My translation for my data in Alaska is off, it should put me in Alaska, but is putting me in Greenland, Africa, or the middle of the Pacific depending on which projection of WGS84 I use. I am trying to figure out the proper projection that UgCS is using so my data from Alaska is where it belongs, in Alaska. Thanks!

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