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Orthophotos with Inspire 1

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Apr 1, 2015
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Hi all, im opening this thread just couse we started debating orthophotos in another thread and i dont want to go offtopic there

so a few weeks ago i took this pics of my cousin heliport/hangar and made an orthophoto with Pix4D (9 photos)

and today i will be doing more testing with this, couse i got a call from a town goberment, who wants to use some drone to do this year cataster and i need to check if i can do it with I1 or i will need to buy another drone, for example, a X8-M from 3DR
 

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for ortho work its all about the camera and how you reference the shots to the IMU
 
At present I do many orthos using a Phantom 2, GoPro with a 5.4mm lens and DJI Ground Station. I do have flytrex Core 2 for the GPS data but I tend to use the georeferencer plugin in QGIS to tag the mossaic out of Photoscan Pro. I get amazing results. Not very exciting images to most so I don't post them. This is mainly for archaeological work.

I will be moving to an Inspire shortly with the anticipation of waypoints coming soon. In Ireland here I need something to fly in stronger winds. I plan to strap my RX100 to it belly to get the 20 megapixel images. The Inspire suits me as it's RTF, I am not an RC or modeller guy.

Anyway, great discussion topic.
 
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well first test with 9 picture with everything in default settings looks good enought

now i did a first flight at 70mts heigh taking 109 images with 5 sec time lapse, flying at 5m/s - 7m/s trying to have 50% overlaping
and a second flight at 120mts heigh taking 135 images, same time lapse, same speed
 
Excellent steady grid there man! We'll done. I get lazy with waypoints! It's nice that the Inspire geotags the images too. Although for real accuracy I use ground control points of known long/lat.
thanks

i have the 4 corners location(lat/long) of the terrain just below my pictures, taken by proffesional GPS, to check my resutls precisition
 
Nice. Did you just have the camera pointed directly down, and set to timelapse, and then fly a steady grid route?
exactly, camera pointed 90° (down), time lapse 5 secs and first flight testing the speed(5-7 m/s) and altittude (70mts), changed to map view and tried to make a grid

now im going to make 2nd flight mosaic
 
yes, i did with pix4d using the 1 week free pro license

but that was just 28 hectares

if i get the contract for the town goberment, i will need something more practical, it might be 5k hectares, and im really thinking about buying a X8+ + camera and renting pix4d monthly
 

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