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Survey 11 – OrthoPhoto ?

Written By: Jean-Paul Cipria - Mar• 14•18

Photo with simple device with some deformations

Photo with simple device with some deformations – No similitude with real view …

Ortho Photo after scan, dense cloud, 3D model.

Ortho Photo after scan, Dense Cloud, Mesh 3D model. Like prependicular Architect Plan … as you can see almost with your eyes. But some deformations are there.

How do we correct photography to delete perspective point seen from an unique point of view ?

Created :2018-03-14 21:48:32. – Modified : 2018-03-25 18:31:55.

Complicated but Not Difficult - Bachelord Level

Bachelord Level

Complicated \wedge \overline{Difficult} Niveau BTS.

Expériences En Construction

Experiment is being drawn up

 

First Step with User Manual

Perspective view with a photography device

Photo with simple device with some deformations

Photo with simple device with some deformations

Picture analysis

We can see at the right side the top frame is too larger than reality. At the left side we can read « Mécanique quantique » at the right side of the book. If we are face of bibliotheque we could’nt read the book title because book is perpendicular to the point of view.

How does Professional Surveyor take photographies ?

Ortho Photo after scan, dense cloud, 3D model.

Ortho Photo after scan, Dense Cloud, 3D model. But some defaults are appeared by a first step explained by … professional manual !!!

Picture analysis

We can’t see the title « mécanique quantique » at the left boookside. I is not readable. It is as we are face of it and perpendicular to this book.

How does we do ?

We take photos from left to right by 50 cm displacement at the same high.

We get photo to Agisoft PhotoScan.

Conclusions

We use user manuel with all important informations located … at the end of document.

! Orthophoto have some important defaults.

Time of calculation is prohibitive (4 to 8 hours to calculate).

PC reseted by 5 mn calculation ==> Mandatory to execute on only one processor of four possible.

This software is boring for us !

How does we do with bad professionnal informations but with amator tutorials ?

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Jean-Paul Cipria
Senior Engineer

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