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Photogrammetry on commercial flights (2021)

leifgehrmann.com

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11–20 of 41 posts

Re: Photogrammetry on commercial flights (2021)

#11

Post by vhcr »

Toutouxc wrote: post #8

> But other than taking a few photos of holiday mementos and lens-flaring sunsets, what’s the point? OT, but for me the point is not having my body absolutely panic from experiencing all kinds of rotation and sudden lateral displacement without anything happening visually. Honestly, I have no idea how people fly anywhere else, I wouldn’t be able to. The speeds and forces experienced even on a calm commercial flight a…

Same way I have no idea how people get dizzy so easily, do you get dizzy when on a boat, or when using a VR headset?

Re: Photogrammetry on commercial flights (2021)

#12

Post by cscheid »

prashp wrote: post #5

This is very cool! How feasible would it be to take a video instead of a photo, then using landmark detection and a stitching algorithm such as SIFT to cover a larger surveying area?

I didn’t use sift, but instead a very dumb old trick of slit screen photo: http://cscheid.net/static/windowseat/

This is 5h of a single video from EWR to SFO by a former colleague. Turns out even a dumb trick like this still is enough to pick out a bunch of geographical features!

Re: Photogrammetry on commercial flights (2021)

#14

Post by atourgates »

Despite the author's criticisms, it seems like there's lots of opportunity for UAV-generated open source imagery, but I can't really find an active community for sharing it.

Open Aerial Mapp[1] seems like a good start, but doesn't seem to be particularly active.

Seems like we could use a "Mapillary[2] but from Above" type of project - only one that doesn't end up getting acquired by Facebook.

[1] https://openaerialmap.org/

[2] https://www.mapillary.com/

Re: Photogrammetry on commercial flights (2021)

#15

Post by [deleted] »

crazygringo wrote: post #3

This is not photogrammetry as the word is usually understood these days. Photogrammetry usually means constructing a 3D model out of a number of 2D photos from lots of different angles, although there are broader definitions as well [1]. This is just skewing a photo you took out the window to overlay it on a map. From the title, I was expecting this to be something about constant super-hi-res photography attached to…

[deleted]

Re: Photogrammetry on commercial flights (2021)

#16

Post by ajsnigrutin »

atourgates wrote: post #14

Despite the author's criticisms, it seems like there's lots of opportunity for UAV-generated open source imagery, but I can't really find an active community for sharing it. Open Aerial Mapp[1] seems like a good start, but doesn't seem to be particularly active. Seems like we could use a "Mapillary[2] but from Above" type of project - only one that doesn't end up getting acquired by Facebook. [1] https://openaerialma…

https://github.com/OpenDroneMap/ODM

You take a drone, point the camera mostly down (a narrow angle, not straight down), take photos of land, with some overlap, preferably from different angles, load the software, and it creates an ortophoto, 3d model, height map, all georeferenced

Re: Photogrammetry on commercial flights (2021)

#17

Post by sorenjan »

prashp wrote: post #5

This is very cool! How feasible would it be to take a video instead of a photo, then using landmark detection and a stitching algorithm such as SIFT to cover a larger surveying area?

A better solution would be to use a program that does what most people think of when they hear the word photogrammetry these days, 3D reconstruction from multiple images, and then make an orthorectified image from that.

OpenDroneMap can do that for example.

https://www.opendronemap.org/webodm/

Re: Photogrammetry on commercial flights (2021)

#19

Post by JoeAltmaier »

sorenjan wrote: post #18

Check the laws in your country before doing this, in Sweden you need permission to distribute aerial photos.

The internet makes that problematical. Does 'distribution' include 'share on facebook'?

I've been wondering for some time, how far do national laws about data sharing matter any more?

Re: Photogrammetry on commercial flights (2021)

#20

Post by sorenjan »

JoeAltmaier wrote: post #19
sorenjan wrote: post #18

Check the laws in your country before doing this, in Sweden you need permission to distribute aerial photos.

The internet makes that problematical. Does 'distribution' include 'share on facebook'? I've been wondering for some time, how far do national laws about data sharing matter any more?

Yes, any distribution including online. Personally I think it's a bit anachronistic to ban distribution of photos now when it's so easy to take and distribute them, not to mention all kinds of commercial services with free aerial and street view photos. People do get prosecuted for it still, so it very much matters.

https://www.lantmateriet.se/en/dissemination-permit/

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