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https://issues.apache.org/jira/browse/SIS-212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux updated SIS-212:
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Labels: gsoc2016 gsoc2017 java mentor (was: gsoc2016 java mentor)
> 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, 0.7, 0.8
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Labels: gsoc2016, gsoc2017, java, mentor
> Fix For: 0.6, 0.7, 0.8
>
>
> This is an umbrella task for some coordinate operation methods not yet
> supported 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
> formulas that we do not support, but this JIRA task lists at least some of
> the operations 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 – 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
> reasonably comfortable with the Java language (but not necessarily with the
> JDK library at large, since this work uses relatively few JDK classes outside
> {{Math}}), and in mathematic. In particular, this work requires a good
> understanding of _affine transforms_: their representation as a matrix, and
> how to map a term in a formula to a coefficient in the affine transform
> matrix.
> Apache SIS has one advanced feature which is not easily found in popular
> geospatial software or text books: the capability to compute the _derivative_
> (or more precisely, the _Jacobian_) of a transformation at a given point.
> Implementation of this feature requires the capability to find the analytic
> derivative of a non-linear formula and to simplify it.
> Implementations of those formulas take place in one of the
> {{org.apache.sis.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/geoapi-conformance/index.html], if possible
> through the Geospatial Integrity of Geoscience Software (GIGS) tests.
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