Programming Portfolio r01

7/31/2019 Programming Portfolio r01

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Michael

Fotiadis

Michael Fotiadis

MSc Geoinformatics

MEng Land Surveying

[email protected]

Maidenhead, United Kingdom

October 2012

Programming Portfolio
mailto:[email protected]:[email protected]


2/10

Android Coordinate Reader

2012

Programming Language: Java

Process built to originally use in my work as a

Land Surveyor for Tube Lines. The surveying teamwas receiving updated control coordinate files by

email frequently and I wanted a viewer built into

my phone to have on the field.

Key Points Created a process built for Android 2.1 and

higher.

Can read a file located in the SD card with 4

columns , preferably of the format [ID, X, Y, H].

Uses an on click event to access the file.

Creates a spinner widget and populates it with

the IDs of the control points.

Displays the coordinates of each selected

point on the screen.

Implemented clauses to check whether the

file exists and is not null.

Key Points Created a process built for Android 2.1 and

higher.

Can read a file located in the SD card with 4

columns , preferably of the format [ID, X, Y, H].

Uses an on click event to access the file.

Creates a spinner widget and populates it with

the IDs of the control points.

Displays the coordinates of each selected

point on the screen.

Implemented clauses to check whether the

file exists and is not null.


3/10

Transformation and Visualization

Program for Android Tablets

(Work in Progress)

2012

Programming Language: Java

The purpose of this program is to convert

coordinates from the London Survey Grid to the

British National Grid (OSGB36) and then to

WGS84 for dynamic display in Google Maps given

that an internet connection is available.

Key Points This process can help engineers locate London

Survey Control Points easily on site.

The first part of the transformation (LS Grid to

BN Grid) will use topology to locate the

position of the point on the transformation

block map and select the appropriate

transformation parameters.

The second part will introduce the datum shift

between OSGB36 and WGS84 so that the

coordinates can be transformed to , for

display in an online mapping service or for

typing them in a GPS.

Heights will not be used as the London Survey

Grid height datums accuracy is under dispute

by engineers.

Key Points This process can help engineers locate London

Survey Control Points easily on site.

The first part of the transformation (LS Grid to

BN Grid) will use topology to locate the

position of the point on the transformation

block map and select the appropriate

transformation parameters.

The second part will introduce the datum shift

between OSGB36 and WGS84 so that the

coordinates can be transformed to , for

display in an online mapping service or for

typing them in a GPS.

Heights will not be used as the London Survey

Grid height datums accuracy is under dispute

by engineers.

841

1

361

1

1

1

1

1

WGS

shift

OSGBBNGridLSGridy

x

y

x


4/10

Coordinate Converters Part 1

2005

Programming Language: Visual Basic

Set of processes built for my dissertation

Reverse Engineering of the GeometricCharacteristics of the Athens Tram Railway

Tracks Horizontal Alignment by Using the GPS

System.

Key Points The first process uses higher geodesy

calculations to convert data between the

Greek Geodetic Reference System 1987

(GGRS87) and its corresponding geoid

Geodetic Reference System 1980 (GRS80).

Reads ASCII files with planar coordinates [ID,

x, y, Geometric Height] and converts them to

geographic coordinate files of the format [ID,

Latitude , Longitude , Geometric Height]

and vice versa.

The second process converts GRS80 ellipsoid

coordinates to geocentric coordinates.

Reads ASCII files of the format [ID, Latitude

Longitude , Geometric Height and converts

them to geocentric coordinate files of the

format [ID, X, Y, Z] and vice versa.

Key Points The first process uses higher geodesy

calculations to convert data between the

Greek Geodetic Reference System 1987

(GGRS87) and its corresponding geoid

Geodetic Reference System 1980 (GRS80).

Reads ASCII files with planar coordinates [ID,

x, y, Geometric Height] and converts them to

geographic coordinate files of the format [ID,

Latitude , Longitude , Geometric Height]

and vice versa.

The second process converts GRS80 ellipsoid

coordinates to geocentric coordinates.

Reads ASCII files of the format [ID, Latitude

Longitude , Geometric Height and converts

them to geocentric coordinate files of the

format [ID, X, Y, Z] and vice versa.

87'1

1

1

80

87'1

1

1

87'1

1

1

GGRS

GRS

GGRSGGRShh

y

x


5/10

Coordinate Converters Part 2

2005


Set of processes built for my dissertation

Reverse Engineering of the GeometricCharacteristics of the Athens Tram Railway


System.

Key Points These processes are used to create a loca

topocentric system so that deformations can

be minimised when working over a small area.

The first process deducts the geocentric

vector [X,Y,Z] of the topocentric central point

from the rest of the coordinates.

Reads ASCII geocentric coordinate files of the

format [ID, X, Y, Z] and outputs files with

differences [ID, DX, DY, DZ] from the centra

point Xo, Yo, Zo.

The second process uses the output file from

process one and creates a topocentric

reference system on a central ,.

Outputs topocentric coordinates [ID, E, N, U]

and also supports the creation of an [E, N, U]

AutoCAD formatted point file for quickinsertion in a drawing.

Key Points These processes are used to create a loca

topocentric system so that deformations can

be minimised when working over a small area.

The first process deducts the geocentric

vector [X,Y,Z] of the topocentric central point

from the rest of the coordinates.

Reads ASCII geocentric coordinate files of the

format [ID, X, Y, Z] and outputs files with

differences [ID, DX, DY, DZ] from the centra

point Xo, Yo, Zo.

The second process uses the output file from

process one and creates a topocentric

reference system on a central ,.

Outputs topocentric coordinates [ID, E, N, U]

and also supports the creation of an [E, N, U]

AutoCAD formatted point file for quickinsertion in a drawing.


6/10

Clock Synchroniser and

GPS Inclinometer Data Merger

2005

Programming Language: Basic and Visual Basic

Set of processes built for my dissertationReverse Engineering of the Geometric

Characteristics of the Athens Tram Railway


System.

Key Points A Basic routine was constructed in order to

synchronise the internal clock of a laptop to

the time string sent directly to its COM port by

a geodetic GPS sensor.

This was done in order to synchronise the

GPS recorded position data with the data of

an inclinometer which had different recording

frequency. It also eliminates null entries.

A second Visual Basic process was created to

eliminate the asynchronous observations and

to append the inclinometer data to the GPS

data as 2 extra columns.

Inputs are a converted topocentric GPS file

[Time Stamp, x, y, h] and an inclinometer file

[Time Stamp, Inclination x, Inclination y]. A

merged file is given as output.

Key Points A Basic routine was constructed in order to

synchronise the internal clock of a laptop to

the time string sent directly to its COM port by

a geodetic GPS sensor.

This was done in order to synchronise the

GPS recorded position data with the data of

an inclinometer which had different recording

frequency. It also eliminates null entries.

A second Visual Basic process was created to

eliminate the asynchronous observations and

to append the inclinometer data to the GPS

data as 2 extra columns.

Inputs are a converted topocentric GPS file

[Time Stamp, x, y, h] and an inclinometer file

[Time Stamp, Inclination x, Inclination y]. A

merged file is given as output.

t (sec) x (m) y (m) h (m) t (sec) Ix (degrees) Iy (degrees)

431710.0 476704.327 4191036.714 0.995 431710.0 0.16 0.65431710.5 476704.334 4191036.687 1.003 431710.5 0.16 0.81

431711.0 476704.345 4191036.654 1.004 431711.0 - -

431711.5 476704.350 4191036.632 0.999 431711.5 0.17 0.90

t (sec) x (m) y (m) h (m) Ix (degrees) Iy (degrees)

431710.0 476704.327 4191036.714 0.995 0.16 0.65

431710.5 476704.334 4191036.687 1.003 0.16 0.81

431711.5 476704.350 4191036.632 0.999 0.17 0.90


7/10

Adjusted Axis Calculation

2005


Process built for my dissertation Reverse

Engineering of the Geometric Characteristics ofthe Athens Tram Railway Tracks Horizontal

Alignment by Using the GPS System.

Key Points My dissertation involved the calculation of the

design axis, which is the line drawn by the

designer prior to constructing the left and

right railway tracks and can be calculated by

measuring the tracks on site.

Having measured the tramway tracks and

processed the positioning data, a routine was

coded in order to reverse engineer the axis.

This process calculates the adjusted position

of each track by combining the inclinometer

data with the positioning data.

It then goes on to calculate the axis between

the two tracks by moving on the right track

and finding the minimum distance to the left

track from each observed point.

Key Points My dissertation involved the calculation of the

design axis, which is the line drawn by the

designer prior to constructing the left and

right railway tracks and can be calculated by

measuring the tracks on site.

Having measured the tramway tracks and

processed the positioning data, a routine was

coded in order to reverse engineer the axis.

This process calculates the adjusted position

of each track by combining the inclinometer

data with the positioning data.

It then goes on to calculate the axis between

the two tracks by moving on the right track

and finding the minimum distance to the left

track from each observed point.


8/10

Moving Average Filter

2005





Key Points This process was created for the smoothing of

the bearing diagram of the calculated axis. The

smoothing was crucial for the next step of

reverse engineering its geometric

characteristics because it would make more

accurate the locating of positions of curvature

changes.

A moving average window was used with

parameters of size in points (N) and number of

points it would move by after each repetition

(Step).

Two extra parameters were introduced: the

deviation of a point from the window average

axis and the acceptable gap between two

points that would have to be filled in if no

point was found.

Key Points This process was created for the smoothing of

the bearing diagram of the calculated axis. The

smoothing was crucial for the next step of

reverse engineering its geometric

characteristics because it would make more

accurate the locating of positions of curvature

changes.

A moving average window was used with

parameters of size in points (N) and number of

points it would move by after each repetition

(Step).

Two extra parameters were introduced: the

deviation of a point from the window average

axis and the acceptable gap between two

points that would have to be filled in if no

point was found.


9/10

Least Squares Curve Fitting

2005





Key Points This was the main process of the dissertation.

It used user input to reverse engineer the

geometric design characteristics of the railway

axis.

Input file used was the adjusted axis

positioning file which contained [Kilometric

position, E, N, U, Track Width, Pitch, Roll

Superelevation, Bearing Azimuth].

The process used ActiveX components to draw

results in AutoCAD 2004 in real time and give

the user dynamic control over the results and

required adjustments.

Initial parameters were inferred from the axis

bearing diagram and were corrected by the

user.

Circular and spiral curves were reverse

engineered through the use of Jacobi Matricesand errors were calculated from the least

square adjustment of the estimated curves.

Key Points This was the main process of the dissertation.

It used user input to reverse engineer the

geometric design characteristics of the railway

axis.

Input file used was the adjusted axis

positioning file which contained [Kilometric

position, E, N, U, Track Width, Pitch, Roll

Superelevation, Bearing Azimuth].

The process used ActiveX components to draw

results in AutoCAD 2004 in real time and give

the user dynamic control over the results and

required adjustments.

Initial parameters were inferred from the axis

bearing diagram and were corrected by the

user.

Circular and spiral curves were reverse

engineered through the use of Jacobi Matricesand errors were calculated from the least

square adjustment of the estimated curves.


10/10

Miscellaneous Programs

2012


Programs built to experiment with different

functions of Visual Studio 11.

Key Points Experimented with a picture browser / viewer

and how it can be implemented in a working

program.

Created a graphic program that could create a

random X by Y hexagonal grid, color the

shapes randomly and allocate user selected

labels to the shapes. The purpose of the

process was to be used to complement

tabletop strategy board games which require

the creation of random hex playing boards.

Key Points Experimented with a picture browser / viewer

and how it can be implemented in a working

program.

Created a graphic program that could create a

random X by Y hexagonal grid, color the

shapes randomly and allocate user selected

labels to the shapes. The purpose of the

process was to be used to complement

tabletop strategy board games which require

the creation of random hex playing boards.

Programming Portfolio r01

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