[OSGeo-Discuss] fastest option of serving huge imagery on web map on the fly

[Jason Birch]

I've often wondered if power-of-two was the best approach from a
perception viewpoint. It definitely makes the most sense from a code
perspective. Anyone know of any research on this?

On 2010-05-22, Christopher Schmidt <crschmidt at crschmidt.net> wrote:
> On Fri, May 21, 2010 at 06:24:26PM -0300, Fabio Renzo Panettieri wrote:
>> On Fri, 2010-05-21 at 13:17 -0700, Karsten-3-2 wrote:
>> > Yes. What I want to do is simply to find out the fastest options to
>> > render on
>> > the fly from raw data imagery
>> > (no tiles whatsoever  stored on disk in addition to the raw data ). I
>> > will
>> > check out what SpatialCache is...
>
> >From raw aerial imagery:
>  1. Store everything as uncompressed tiffs.
>  2. Make images as large as possible. (This probably requires BigTIFF
> support.)
>  3. Use overviews -- usually one for every power-of-two level from the base
>     image up to the point where you have 256 x 256 overviews
>     (gdaladdo)
>  4. If you have too many images to make one large image practical, create
>     one reduced size image that you use at lower zoom levels.
>
> All of this is based around serving with MapServer. I have no experience
> using other imagery servers to solve this problem.
>
> Regards,
> --
> Christopher Schmidt
> Web Developer
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