Hi List,
I would like to simplify the GridCoverage machinery by deprecating concepts
of Coverage's ViewType and related classes such as ViewsManager,
SampleToGeophysics math transformation,....
Most parts of the code related to these concepts are indeed only useful
when you deal with a coverage which contains packed data whilst in the vast
majority of cases we always deal with unpacked datasets. Moreover,
geophysics data can be properly rendered through SLD (by means of colormaps
and rendering transformations) as preferred by the data user.
Beside of that, these classes are sometime subject of unneeded processing
steps (as the one performed by the ViewsManager to create the different
views Native/Packed/Geophysic/Photographic of a coverage) as well as
unexpected behaviours in some cases. As an instance, the inner scan of all
the data values performed to determine the categories range to find the
inverse transformation (and inverse range) when some parameters are
missing. This resulted in performance loss on big datasets. Finally, there
is some other auto-magic logic happening there which led to hard debugging
times in the past. It tooks a while to figure out what was going wrong with
some components of the coverage (sample and color model) complaining
against some underlying view's assumptions.
Therefore, I would like to deprecate their usage in the code (after the
freeze) on 14.x (removing them on 15.x) from the GridCoverage
loading/processing machinery by making sure that things still continue
working as before.
This will result, as an instance, in stop asking for geophysic view of a
dataset (with respect to its native one, or the packed one) and just get
the data as is. The reader will make sure to deal with corner cases if
there are. Parts of code which was eventually dealing with different views,
will be updated accordingly.
Does anyone has any objection on this? (I will obviously create a JIRA and
wait for the freeze)
Please, let me know.
Cheers,
Daniele
==
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Ing. Daniele Romagnoli
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