Hi.

I was looking at this post http://diydrones.com/profiles/blogs/maps-made-easy and am looking to get into mapping with an Iris and currently have a GoPro Hero3+ Silver camera.

I am thinking of either changing the lens to remove the fisheye or distortion, or buying a Cannon camera to use CHDK.

Here is a blog post about about changing your GoPro lens .

I am leaning towards buying a Cannon camera because I think you have better control over the images with CHDK and no distortion.  This Cannon SX 230 HD has built in GPS.

Anyone have any tips on mapping?

How do you get your pictures to overlap?

What is the best height to fly at?

Can anyone point me to a "mapping 101 for drones" webpage ?

Thanks :)

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Hi,

I had same dilemma like you and decided to go for GoPro and new lens. Main reason was weight, you are comparing 75g of GoPro vs. cca 220g with Canon. I think weight is IRIS's weak spot.

Also I don't think build-in GPS is big advantage, I am planning to use flight log for georefferencing photos, I found really useful guide on conservation drones.

BR, Tomas

Thanks Tomas.  How are you controlling the GoPro?  Right now I have mine set to take a photo every 1 second.

I don't think this is very accurate in terms of overlapping or setting a starting point.  What lens did you get for the GoPro?

Hi, sorry for delay.

First of all, I didn't try it yet. This weekend I hope to install gimbal. Than I will try to take photos every 1s, like you. My idea is, that if the camera is pointing directly to ground, geo-reference is related to middle of photo. In theory it seems alright, I will tell you about reality on Monday.

Lens is on the way. After while I decided to go for this one from Ragecams - http://ragecams.com/shop/54mm-rectilinear-flat-lens-gopro-hero3sony...

Add to in-build GPS, when you will place camera under copter, I think there will be lots of interference from electronics on top of it...

Thanks.  Let me know how it goes and how you like that lens.

You and I are working on the same project.
I went with the S100 over the 260XS due to weight.
The mount is a custom 3D printed design I had commissioned
that fits the same mounting holes as gimbal and uses one of
the front mounting screws of the stationary gopro mount. I should
have everything up and running for test flights by the end of Oct.

BTW, Although the GoPro can take still images, you would be better off
with a Canon camera running CHDK because of the manual control
over aperture and shutter settings. This alone will pay dividends in 
your post production workflow because exposure will be consistent.

Thanks Oscar.  Eventually I will get a Canon.  Let us now how it goes.

Time lapse value depends on percentage of forward overlap and the speed of your drone. Mission Planner will help you calculating that value. Just set your camera time lapse value under the calculated. If you choose to use CHDK, there are some scripts allowing you to specify the delay value before camera start to shoot. You should estimate it by your self.

If you're worrying the weight of Canon camera, you may consider the Ixus 220 or 255 of Canon. They are lighter. SenseFly Swinglet, as well as some other commercial drones, uses it.

There's a 3D mapping wiki page here.  I imagine you've already seen it but just in case.

Glorious. Thank you Randy. I actually hadn't seen it.

Hi,

Any recommended gimbal for aerial mapping with Iris ? Planned camera is Canon sx 260

Thanks

 

Morning Pascal.

I'm no expert on this, but I skipped the SX260 because Iris'
total payload of 400g. The SX260 comes in at 261g.
That's why I went with  the fixed mount design. If everything
goes according to plan, total payload for me should be just above
300g.

If you hear of anything though I'd love to know.
There was someone who managed to put a front
mounted gimbal on Iris, but I think that was for a
gopro.

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