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https://issues.apache.org/jira/browse/SIS-593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux reassigned SIS-593:
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> Resolve auxiliary files relatively to GML or WKT file providing parameter
> values
> --------------------------------------------------------------------------------
>
> Key: SIS-593
> URL: https://issues.apache.org/jira/browse/SIS-593
> Project: Spatial Information Systems
> Issue Type: Improvement
> Components: Referencing
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Major
> Fix For: 1.5
>
>
> In the ISO 19111 {{ParameterValue}} class, values that are too complex for
> being expressed as an {{int[]}}, {{double[]}} or {{String}} type may be
> encoded in auxiliary files. It is the case, for example, of gridded data such
> as datum shift grids. The name of an auxiliary file is given by
> {{ParameterValue.valueFile}}, but often as a _relative_ path. The directory
> where that file is located is unspecified by ISO 19111 and depends on the
> operation using the parameter. For example, datum shift grids used by
> coordinate transformations are searched by Apache SIS in the
> {{$SIS_DATA/DatumChanges}} directory, where {{$SIS_DATA}} is the value of the
> environment variable. However, the latest approach requires that all
> potentially used auxiliary files are preexisting on the local machine. This
> assumption may be applicable for parameters coming from a well-known registry
> such as EPSG, but cannot work with arbitrary operations where the auxiliary
> files need to be transferred together with the parameter values. For the
> latter case, an alternative is to consider the auxiliary files as relative to
> the GML document or WKT file that provides the parameter values. For allowing
> users to resolve or download auxiliary files in that way, a
> {{getSourceFile()}} method needs to be added to Apache SIS
> {{DefaultParameterValue}} class. Operations can then use {{URI.resolve(URI)}}
> for getting the absolute path of an auxiliary file from the same server or
> directory than the GML or WKT file of parameter values.
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