Re: [Geotools-gt2-users] generating large map bitmaps?

[Michael B. <mic...@gm...>]

Hi Akos,

Andrea, Jody and others here are rendering gurus and I hope they will
follow with more expert advice, but I'll get the ball rolling...

If the destination image fits into available memory then yes, simply
create a Graphics2D instance from the image and pass that to the
renderer.

If the destination image is way too big for available memory you might
have a look at the JAITools DiskMemImage class. This is a tiled image
class that caches tiles both in memory and in temporary files on disk.

http://jaitools.org/docs/jaitools/stable/apidocs/org/jaitools/tiledimage/DiskMemImage.html

You can tune the volume of image data that is stored in memory vs on
disk to reduce disk i/o time. However, it will still be a great deal
slower than having the entire image in memory.

Michael


On 16 January 2013 07:35, Ákos Maróy <ak...@ma...> wrote:
> Hi,
>
> I'd like to create considerably large bitmaps by rendering SLD-styled
> layers using the geotools API. The rendering part looks straightforward,
> with a DataSource, Style created via SLDParser, StreamingRenderer,
> FeatureLayer, MapContent, etc. objects. But, it seems that creating
> large bitmaps using Java is not that simple. Moreover, I see that quite
> some work has already been done in the geotools library to this extent.
>
> Still, looking at the documentation, it's not straightforward for me
> which way to go.
>
> If I already have a MapContent object, with appropriate FeatureLayer
> objects in it, what would be the intended / suggested way to render it
> into big bitmaps. Should one simple create a TiledImage, get the
> Graphics2D object via TiledImage.createGraphics(), and use the
> StreamingRenderer to render into this Graphics2D object? Or is there a
> better / more advised way of doing this?
>
> by big, I mean for example rendering an area of about 550km x 350km at a
> scale of 1:500.000, with 600dpi or more - that is images of about 26.000
> x 16.000 pixels or more.
>
> Best regards,
>
>
> Akos
>
>
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