we want to feature the following report made by Francesca Sileci (Politecnico of Torino) and describing an approach to Aerial Photogrammetry via 3DF Zephyr Aerial. The outcomes will be joined her master’s degree thesis entitled “From Geomatics to BIM: the case of the amphitheatre of Pollenzo”.

The amphitheatre of Pollenzo

In order to arrange a master’s degree thesis focused on the amphitheatre, I have exploited 3DF Zephyr Aerial as photogrammetric software to process data acquired by means of aerial photogrammetry, after performing more than one survey carried out along with a team of Geomatics at the Politecnico of Torino.

The very first test run with 3DF Zephyr Aerial had given a Final Mean Residual error of 1.42 m. As the expected error on this kind of elaborations has ranged from 2 to 4 cm I have then carried on performing some other tests so as to produce a better result.

I have started my work loading cameras positions coordinates within the software application. Then I have worked with a manual calibration I have created beforehand, although 3DF Zephyr does not need that since it is able to automatically determine the camera calibration. As a Canon Power Shot ELPH 110 HS has been used to collect the pictures I have chosen the “Adjust tangential distorsion” parameter before running the Structure from Motion process.

After generating a sparse point cloud and before starting the dense one I have placed 44 control points directly on the images, matching each one of them on at least three pictures. That has been a crucial phase to produce an accurate result; I have noticed some wrong coordinates taken in field and thus removed certain control points, especially those carrying the higher residual error value.

In the end, I started by having 44 control points which were then reduced to 17 on each control point removal iteration (namely: 36, 26, 21 and finally 17)

I have succeeded in gaining a final residual error of 0.029 m by computing bundle adjustment once again. That error value is even more remarkable considering the height of photographic acquisition (127 meters).

Topographic survey has been carried out with GNSS system in RTK modality so as to get orthometric heights and to load them within the software.

Francesca Sileci

francesca.sileci@hotmail.it

https://it.linkedin.com/in/francesca-sileci-2b011094

The post A case of Aerial Photogrammetry appeared first on 3Dflow.

3D ArcheoLab takes advantage of 3D technologies to improve musems accesibility and it is focused on tactile paths creation for blind people. SPQwoRk Factory is both a coworking space and a fab lab, and it has been one of the Fab Academy italian venues since 2015.

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Further information about conference program can be find at the following link: http://www.iciap2015.eu/program.html

The 3Dflow Team

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In order to use 3DF Sunny you need to register a 3Dflow account on https://www.3dflow.net/register/ with the same email bound to your 3DF Zephyr Pro license. You can either access 3DF Sunny from Tools -> Cloud Computing -> Open Sunny or directly from your desktop browser at http://sunny.3dflow.net

Need help? Feel free to contact us!

3Dflow Team

The post Have a Sunny day! appeared first on 3Dflow.

These allow us figuring out the approaches to perform a tool as handy as functional. Listening to the struggles that pros live every day is the only chance to help the latter overcome them.

Our aim is their outcome and the way they get it.

–

That’s what happens in Zephyr development.

Microgeo, one of the most remarkable italian firm in surveying world, has noticed it, so it has picked to pull our software solution alongside its own systems.

http://microgeo.it/Droni/software.php

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The Lion of Mosul – 3D model made with 3DF Zephyr

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3Dflow has recently released the long‐awaited Lite version of Zephyr. It keeps its well‐known 3D reconstruction workflow, from Structure from Motion step up to the texture generation.

The only change is in the GUI renovated design (chill out, Masquerade didn’t leave you), as well as an ideal shift: a tailored tool for digital sculpting, body scanning and 3D printing worlds, as well also artists, freelance, starter users and many more!

In a nutshell it aims to satisfy all the fields that don’t ask for geographic data handling.

Here are some brand‐new highlights about 3DF Zephyr Lite:

Texture generation tool

Now textures get their own room inside the 3D
reconstruction workflow. After you choose its size,
you just need to set the amount of vertices to be
used as well as how many cameras you want to
exploit for texturing.

Human body preset

If you’re about to scan a whole human body or a
close‐up, you don’t need to tinker with advanced
settings. Just pick the Body preset and let Zephyr do
the work!

Upload to YouTube

We took a further step forward in order to be more
social than ever! Direct upload to YouTube has been
introduced so as to foster 3D model sharing and to
make user free of performing stuff for their own
purposes.

One more thing: we are talking about a low‐cost solution!

For further details check the features comparison between Pro and Lite version by clicking here!

Sound off your sensations on our Facebook page!

The post A quick overview on Zephyr Lite appeared first on 3Dflow.

Masquerade, our recently added masking tool is so damned cool that there’s no need to further explain it!

Anyway, you can find out a new videotutorial available here.

Enjoy the Silhoutter and draw your red and blue strokes! Pictures masking has never been so easy and cutting-edge!

Hurry up and check it out!

Many more free tutorials on our dedicated section

3Dflow Team

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