September 24, 2019

3D Point Clouds and Drone Photogrammetry

"3D Point Clouds and Drone Photogrammetry"

3D Point Clouds

photogrammetry project drones London, photographic and video surveys for building & roof inspections,

We were ask a local history group to document and map an area of a Brockley and Ladywell cemetery in Brockley South East London .  See about 3D Point Clouds and Drone Photogrammetry from here.

3D Point Clouds

Drones used for surveying.

As this is a conservation and nature reserve area as well as being a historical site. We needed permission from the landowner to fly here. Luckily we had connections with the Friends of Brockley and Ladywell Cemeteries group. who introduced us to Lewisham Council who in turn generously. Gave us permission to fly from the site.

3D Point Clouds and Drone Photogrammetry

Our aim was to produce an example of 3D Photogrammetry.

3D Point Clouds

We decided on a location that was the old chapel on the grounds.

3D Point Clouds photogrammetry and drone work

Using drones for photogrammetry.

The methodology behind 3D Photogrammetryis obtaining still images at various points around an object (the chapel). Luckily for us, we had a decent space (a few close trees. But the generally open area to encircle the chapel.

Once we had set up an orbit flight path around the chapel. We then proceeded to take regular photos every 1 or 2 seconds. Whilst the drone took a pre-determined path. This would enable us using the software to compute what’s called a point cloud (a set of data points in space)

Please take a look at the video below of the process:

Using the software a point cloud would be generated. Which would, in turn, create a 3D model of the chapel from the 2D stills images of the camera of the drone.

Building a  3D model is a good historical record of any subject (a face, sculpture, art) or building.

3D Point Clouds drone surveys

3d Photogrammetry with drones

Depending on photographic resolution (the camera's specification with regard to resolution) determines the amount of detail. You can achieve this in the final model.

Once the data has been interpreted and a model generated. It can export from the software in various 3D formats (files) that can use. For example to create a 3D model using a 3D printer.

Alternatively, the model could be transcoded into a video editing package for use in a film or perhaps other media projects.

Many cameras on drones also collect the GPS data for each still frame. So there is a possibility of integrating the model using google maps.

Another example of 3D integration from Central London:

3D Point Clouds photogrammetry and drone work

this example shows the front elevation of a London Townhouse again. This is a good historical record of any location note that. We did not require a full 360 of the subject as this would have been a very awkward location to photograph all around.

But it shows the compliance of a drone at any location.

Further reference see integrating 3D models with Google Earth:

3D Point Clouds

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