Hi Arne,
Thanks for the reply. I get what gridsets do (further clarified by your
reply), I don't understand how to use them. What other parts of GeoServer
do they interact with? Or what parts of the client software? And how do you
get the client software to use the same gridsets? The documentation only
tells me how to create them, it doesn't say what I should do after that.
-----
Unfortunately FME can't create GeoTIFFs with overviews and possibly not
inner tiling too. I'm aware GDAL does but we'd prefer to use FME.
Does anyone else have any suggestions how to process the rasters?
Cheers,
Jonathan
On 16 December 2012 23:23, Arne Kepp <[email protected]> wrote:
> If you want to have efficient caching it is crucial that clients ask for
> the tiles that you have already generated. Basically they need to know the
> grid that you are basing your tiles on (origin of the grid, size of each
> tile in terms geographical extent and in terms of pixel size). And you need
> to define this for every zoom level (because for a given resolution the
> tiles may not cover the full extent exactly).
>
> The result is a set of grids, aka gridset, which all your clients need to
> know about and use. The most commonly used, but rarely the best, is the one
> Google- and Bing Maps use for Spherical Mercator.
>
> Not the right person to ask what raster approach is the most efficient,
> but converting the JPEGs to GeoTIFFs with overviews and inner tiling will
> probably be quiet fast, even though they take up more space. Performance on
> that end is less important if you can use tile caching. You can have them
> act as one layer using imagemosaic.
>
> -Arne
>
>
>
>
>
> On 12/14/12 14:21 , Jonathan Moules wrote:
>
> Hi List,
> A few generic questions.
>
> First: What are gridsets actually for? I know how to create them (the
> documentation is very good for that), but I can't figure out what they're
> for.
>
> Second: I have a number of large rasters in JPEG2000 format (up to
> several GB in size). GeoServer can't access these (we're not going to use
> the extension). I have FME so can do lots of processing on them if needed:
> What's the best way to serve these up? I was thinking of tiling them (WMS
> can serve tiled data right?). But then the question becomes, which tiling
> system do I use? There seem to be several:
>
> imagePyramid -
> http://docs.geoserver.org/stable/en/user/tutorials/imagepyramid/imagepyramid.html?highlight=tiling
> JDBC -
> http://docs.geoserver.org/stable/en/user/tutorials/imagemosaic-jdbc/imagemosaic-jdbc_tutorial.html?highlight=tiling
> imageMosaic -
> http://docs.geoserver.org/stable/en/user/tutorials/image_mosaic_plugin/imagemosaic.html
>
> What are the advantages/disadvantages of each? I'm guessing some are
> easier to create/use and possibly faster.
>
> Thanks,
> Jonathan
>
>
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