thanks Nils for your help.
after reading your comments I am assuming that suppose two Geotiff
files having different pixel sizes will not fit in.
For example here is the pixel size of two Gtiffs I get through gdalinfo command
gt.tif ---> Pixel Size = (0.000002286186497,-0.000002286186497)
gt2.tif---> Pixel Size = (0.000002284786221,-0.000002284786221)
and both have same projection
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.2572235630016,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
so the above mentioned tif files need to have the same pixel size if
they have to be part of one mosiac, this means I have resample all of
them to same pixel size but that might end up messing the imagery.
On Mon, Nov 22, 2010 at 3:34 PM, Nils Weinander
<[email protected]> wrote:
> On 2010-11-19 08:47, Imran Rajjad wrote:
>>
>> thanks for your suggestions.
>>
>> but even image pyramid would be required to put throught geowebcache,
>> because one time rendering and cache works well in production
>> enviroments.
>
> Image pyramids should work with GWC just like image
> mosaics, as both produce regular WMS output.
>
>> one more thing about the image mosiac. does it require all images to
>> be in same resolutions?
>
> All images in one mosaic should have the same resolution
> (you declare this in the properties file for the mosaic).
>
> If you have images of different resolution for different
> zoom levels and an image pyramid doesn't fit you can set
> up one image mosaic per resolution. I did it like this:
>
> * One image mosaic layer per resolution (six in all)
> * A default style (SLD) for each image mosaic layer,
> with defined MinScaleDenominator and/or MaxScaleDenominator
> in order to display the correct data for the current
> zoom level
> * A layer group which consists of all six image mosaic
> layers
>
> I also had to tweak layer transparency in order to get
> correct display (thanks Daniele!).
>
> --
> mogul | nils weinander |
> hudiksvallsgatan 4 113 30 stockholm sweden |
> +46 8 4100 6456 | +46 709 78 28 37 |
> [email protected] | skype: nils.weinander |
> www.mogul.com
>
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