Hi Simone:
I'm understanding that you're saying that my poor performance is because
I do:
coverage = (GridCoverage2D) reader.read(null);
before doing:
mapContext = new DefaultMapContext(crs);
mapContext.addLayer(reader, st);
renderer.setContext(mapContext);
even though I only use the coverage to get the CoordinateReferenceSystem
to create the DefaultMapContext?
On Tue, December 11, 2007 17:24, Simone Giannecchini wrote:
> 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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>
>
>
> --
> -------------------------------------------------------
> Eng. Simone Giannecchini
> President /CEO GeoSolutions S.A.S.
> Via Carignoni 51
> 55041 Camaiore (LU)
> Italy
>
> phone: +39 0584983027
> fax: +39 0584983027
> mob: +39 333 8128928
>
>
> http://www.geo-solutions.it
>
> -------------------------------------------------------
>
--
Diego Fdez. Durán <[EMAIL PROTECTED]> | http://www.goedi.net
GPG : 925C 9A21 7A11 3B13 6E43 50DB F579 D119 90D2 66BB
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