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Date: Sun, 13 Mar 2016 01:26:33 +0000 (UTC)
From: "ndangoh joseph suh (JIRA)" <jira@apache.org>
To: sis-commits@incubator.apache.org
Message-ID: <JIRA.12844135.1436527498000.588.1457832393752@Atlassian.JIRA>
In-Reply-To: <JIRA.12844135.1436527498000@Atlassian.JIRA>
References: <JIRA.12844135.1436527498000@Atlassian.JIRA>
 <JIRA.12844135.1436527498307@arcas>
Subject: [jira] [Commented] (SIS-212) Coordinate operation methods to
 implement
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    [ https://issues.apache.org/jira/browse/SIS-212?page=3Dcom.atlassian.ji=
ra.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D1519206=
1#comment-15192061 ]=20

ndangoh joseph suh commented on SIS-212:
----------------------------------------

Hi Martin,

        My name is Ndangoh Joseph S, a third year undergraduate in the univ=
ersity of Buea Cameroon, studying computer software engineering. I found th=
is project interesting and i will like to participate in gsoc 2016 to contr=
ibute to this project.

I have good programming skills in java, java spring framework, javascript a=
nd c. I am currently working in an emerging startup, Skylabase Enterprize(h=
ttp://www.skylabase.com), as a software developer.

I have read the project idea and have seen the open issues and also the app=
reciable work you have done. I am going through the documentation here http=
://www.epsg.org/GuidanceNotes, inorder to understand the project better.

Please guide me on what to do next.

Thanks
Ndangoh Joseph.

> Coordinate operation methods to implement
> -----------------------------------------
>
>                 Key: SIS-212
>                 URL: https://issues.apache.org/jira/browse/SIS-212
>             Project: Spatial Information Systems
>          Issue Type: Task
>          Components: Referencing
>    Affects Versions: 0.6
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>              Labels: gsoc2016, java, mentor
>             Fix For: 0.6, 0.7
>
>
> This is an umbrella task for some coordinate operation methods not yet su=
pported in Apache SIS. Coordinate operations include _map projections_ (e.g=
. Transverse Mercator, Lambert Conic Conformal, _etc._), _datum shifts_ (e.=
g. transformations from NAD27 to NAD83 in United States), transformation of=
 vertical coordinates, _etc_. We can of course not list all possible formul=
as that we do not support, but this JIRA task lists at least some of the op=
erations listed in the EPSG guidance notes.
> The main material for this work is the EPSG guidance notes, which can be =
downloaded freely from the following site:
> {panel}
> IOGP Publication 373-7-2 =E2=80=93 Geomatics Guidance Note number 7, part=
 2
> Coordinate Conversions and Transformations including Formulas
> http://www.epsg.org/GuidanceNotes
> {panel}
> Google summer of code students interested in this work would need to be r=
easonably comfortable with the Java language (but not necessarily with the =
JDK library at large, since this work uses relatively few JDK classes outsi=
de {{Math}}), and in mathematic. In particular, this work requires a good u=
nderstanding of _affine transforms_: their representation as a matrix, and =
how to map a term in a formula to a coefficient in the affine transform mat=
rix.
> Apache SIS has one advanced feature which is not easily found in popular =
geospatial software or text books: the capability to compute the _derivativ=
e_ (or more precisely, the _Jacobian_) of a transformation at a given point=
. Implementation of this feature requires the capability to find the analyt=
ic derivative of a non-linear formula and to simplify it.
> Implementations of those formulas take place in one of the {{org.apache.s=
is.referencing.operation}} sub-packages ({{projection}} or {{transform}}). =
Implementations of JUnit test happen partially in Apache SIS, and partially=
 in the ["conformance module" of the GeoAPI project|http://www.geoapi.org/g=
eoapi-conformance/index.html], if possible through the Geospatial Integrity=
 of Geoscience Software (GIGS) tests.


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