Hi,
The idea is that the GetCapabilities message includes all the necessary
information about the configured gridsets which are supported by the server.
After that It is up to the client software or programmer to know what to do
next. For example uDig knows automatically how to deal with WMS-C service once
it has read the GetCapabilities. I am remembering that QGIS can do the same.
With OpenLayers the developer needs to know how to make the application to use
exactly the same grid system than the server. Information delivered by WMS-C,
TMS and WMTS GetCapabilities is enough for that. For the Web Mercator system
configuring OpenLayers is easier
http://docs.openlayers.org/library/spherical_mercator.html
Once you have created the gridset and layers are available from the service you
have finished your work on the Geoserver/GWS side. Next you will need to start
reading the client software documents and learning how to utilize those
services.
FME seems to be able to use inner tiling
http://docs.safe.com/fme/reader_writerPDF/geotiff.pdf
If you want definitely to use FME you can create the tiled tiffs with that and
handle just the overviews/pyramid layers with GDAL by running gdaladdo for the
images. Better alternative for Geoserver could be to use gdal_retile
http://docs.geoserver.org/stable/en/user/tutorials/imagepyramid/imagepyramid.html
-Jukka Rahkonen-
Jonathan Moules wrote:
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]<mailto:[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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