## Engineer's Book

————— PHYSICS – SPACE – ALGORITHMICS ——-

## Survey 04 – What about a Job in Abu-Dhabi in 2017?

Written By: Jean-Paul Cipria

Architecture – Model – Ref. [CIPRIA-Dubaï Creek Buliding-2017]

Have you got difficulties to find job in France ?

Land Surveyor, United Arab Emirates – Abu Dhabi

Contents

# Job Summary

….. is seeking an experienced Land Surveyor major project located in Abu Dhabi. Plans, organizes, and directs work of one or more survey parties engaged in surveying earth’s surface to determine precise location and measurements of points, elevations, lines, areas, and contours for construction, map-making, land division, titles, mining or other purposes: Researches previous survey evidence, maps, deeds, physical evidence, and other records to obtain data needed for surveys.

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## Survey 03 – Sketch Plan

Written By: Jean-Paul Cipria

How do we Draw a Sketch Plan ?

Sketch Plan – Croquis de Repérages – RN219 – Draveil

We use to implant Survey Nails when we Localize Object with a Millimeter Accuracy.

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Created :2017-09-27 17:56:21. – Modified : 2018-12-01 18:00:37.

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Bachelord Level – Not Difficult

Done … Un Café ?

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## Survey 02 – Optical Square – How do We Project Perpendicularly on a Predefine Axes ?

Written By: Jean-Paul Cipria

Optical Square Measurement on Autocad – Perpendicular Measurements to an X axe

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Optical Square

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Created :2017-09-25 18:54:41. – Modified : 2018-12-01 18:00:48.

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Bachelord Level – Not Difficult

Experiment is being drawn up

## Survey 01 – Survey and Topography

Written By: Jean-Paul Cipria

Topographical Survey by a Theodolite

How Do we Measure Position, Altitude, Range or Distance, Angle, Surface with the Right Accuracy ? How do we Plot it on Earth Plan ? How do we represent object situation on 3D Earth ?

It is Topography !

Complicated but Not Difficult – Bachelord Level

Expériences En Construction

Created :2017-09-06 18:32:12. – Modified : 2018-12-01 18:00:57.

First we have made remarks on Earth form. It is around an ellipsoid. Then we remarked also that Earth have oceans with some ellipsoid form but it exists also mountains.

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## Navigation 13 – Spherical Position and Local Plan – Spherical Trajectories ?

Written By: Jean-Paul Cipria

Spherical Trajectory – Matlab Personal Algorithms – ©Jean-Paul Cipria 2017

How do we set a Position on Earth and how we determine Local Coordinates and Perpendicular Plan ?

And then how do we find trajectories point by point on Earth ? With and … without Latitude and Longitude, only with an Absolute Rotation Angle ?

Done … Un Café ?

Complicated but Not Difficult – Bachelord Level

Created :2017-08-11 16:09:53. – Modified : 2018-04-01 17:35:45.

We want to « navigate » on earth with direct trajectory from P point to B point but merely (simplement ?) use latitude and longitude ? When we are in local coordinates we use for a small instant an absolute directionnal vector. When all coordinates are aligned on a known axes meridian for exemple we can « trace » trajectory easily but … if we turn our spherical earth or our route as we can see on following pictures then problems begin.

Some web sites and bachelord courses describe local plan as we do on the first paragraph but how do we navigate without use $d\varphi$ and $d\theta$ like changes of tack on sailboat (virements de bord d’un voilier) ?

The same applies for telescopes, radars, robotic arms [CIPRIA-Robotics-2015], or satellites trajectories. We can’t do some thousands small iterations on elevation and azimut motors ! Did you see the NASA trajectories panels at TV when they launched spatial engines ? Here are the beginning of understanding how to … think and, as an arrow indicate direction and sens, how to do …