[mapserver-users] Re: Raster Strategies Examples

[Edi.Karadumi]

Sorry but im still not understanding this:

> That remains a complicated question.  I believe I suggested 1/32 as a
> good overview level since beyond that point a normal map view will tend
> to involve a significant number of files.

My only problem now is to find the correct scale for each layer. I use
minscale and maxscale for the original layer and the mosaiced layer. So
since my data will be shown from 1:1500000 to 1:100 the minscale of the
original layer will be 100 and maxscale X. The minscale of the mosaic
overview will be X and the maxscale 1500000

original:
minscale 100
maxscale X

mosaic:
minscale X
maxscale 1500000

i cant find X?

On Thu, Aug 19, 2010 at 3:15 PM, Frank Warmerdam [via OSGeo.org] <
ml-node+5440161-2089753629-182671 at n2.nabble.com<ml-node%2B5440161-2089753629-182671 at n2.nabble.com>
> wrote:

> Edi.Karadumi wrote:
> > Thanx to you my questions are comming to an end
> >
> > Three more last things
> >
> > Should i retile the new mosaiced overview? Meaning should i create
> smaller
> > size tiles of the new mosaic? or 2Gb is not a problem
>
> Edi,
>
> Generally speaking, as long as you enable internal tiling when building
> the mosaic there is no need to break it down into separate files.
> Add '-co TILED=YES' to the gdal_merge.py command to produce an output
> GeoTIFF file that is internally tiled.
>
> > And how can i find in which scale should i switch layers? So what will be
>
> > the maxscale of the original layer?
>
> That remains a complicated question.  I believe I suggested 1/32 as a
> good overview level since beyond that point a normal map view will tend
> to involve a significant number of files.
>
> > if ill still have performance problems, or ill get 1-2 terabytes of data
> > more should i make another mosaic with 0.08*16 or 0.08*8, or is there
> > another strategy?
>
> I presume as you add data, your area is growing.  If that is so, the 1/32nd
>
> overview level is still appropriate, and you just need to regenerate the
> overview for the larger area.
>
> If you are using MapServer and GDAL then there is no real problem with
> using
> one large geotiff file for the overview as long as it has internal tiling,
> even if it grows to many GB in size.
>
> Best regards,
> --
> ---------------------------------------+--------------------------------------
>
> I set the clouds in motion - turn up   | Frank Warmerdam, [hidden email]<http://user/SendEmail.jtp?type=node&node=5440161&i=0>
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
>
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