Ciao Diego,
quick explanation given:
If you give the reader to the renderer the latter tries to load a
suitable coverage each time yu zoom and/or pan in order to make things
much faster. Before you were requesting the whole coverage at its
maximum res and you were zooming/panning using that all the time. This
would have meant resampleing/translating the highest res coverage all
the time, which is a amemory consuming task if the coverage is pretty
big as yours is.
Ciao,
Simone.
On Dec 11, 2007 6:16 PM, Diego Fdez. Durán <[EMAIL PROTECTED]> wrote:
> I need a little explanation :)
>
> When you say:
>
> > 2>
> > In your code you are providing the traight coverage to the map pane.
> > To gain access to decimation on reading and/or overviews you need to
> > provide the map pane with the reader directly not with the coverage.
> > The renderer wil then ask the reader to supply the best resolutio
> > navailable exploiting overviews/decimation
>
> Now I'm doing this:
>
> [...]
> AbstractGridCoverage2DReader reader;
> try {
> reader = new ImageMosaicReader(file, new
> Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
> } catch (IOException ex) {
> ex.printStackTrace();
> return;
> }
>
> crs = coverage.getCoordinateReferenceSystem();
>
> StyleBuilder styleBuilder = new StyleBuilder();
>
> ColorMap cm = styleBuilder.createColorMap(
> new String[]{"0", "255"},
> new double[]{0, 255},
> new Color[]{ new Color(0, 0, 0),
> new Color(255, 255, 255)},
> ColorMap.TYPE_RAMP); // XXX: ?
>
>
> RasterSymbolizer rs = styleBuilder.createRasterSymbolizer(cm, 1);
> Style st = styleBuilder.createStyle(rs);
>
> mapContext = new DefaultMapContext(crs);
> mapContext.addLayer(reader, st);
> renderer.setContext(mapContext);
> [...]
>
> I don't understand when you say:
>
> > To gain access to decimation on reading and/or overviews you need to
> > provide the map pane with the reader directly not with the coverage.
>
> I thought than I was doing it already.
>
> Thanks!
>
> --
> Diego Fdez. Durán <[EMAIL PROTECTED]> | http://www.goedi.net
> GPG : 925C 9A21 7A11 3B13 6E43 50DB F579 D119 90D2 66BB
>
>
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