[Geomoose-users] Estimating tile size

[Brent Fraser]

Remember my PNG tiles are compressed. And my estimate (based on my 
Landsat experience) is that if you tiled (into compressed PNGs) your 
20GB (why isn't it 12.5 GB?), the resulting levels 11 thru 20 would be a 
total of about 20GB.

Best Regards,
Brent Fraser

On 1/29/2013 11:25 AM, Paul Wickman wrote:
> Ok.  So, my 20 GB uncompressed TIFF image would come in at roughly 26 
> GB tiled?  Is that per tile level?  This number is an order of 
> magnitude smaller than Brent's math.
>
> Sorry if I'm not being clear.....
>
>
> On Tue, Jan 29, 2013 at 11:41 AM, Basques, Bob (CI-StPaul) 
> <bob.basques at ci.stpaul.mn.us <mailto:bob.basques at ci.stpaul.mn.us>> wrote:
>
>     Paul,
>
>     We've been building these here at the City for a number of years
>     now.  Using a halving of resolution for each new level.
>
>     Generally, the space requirements will end up at approximately
>     1.333 times the size of the original data.  Assuming you aren't
>     trying to interpolate pixels at the bottom level of course. Also,
>     the bottom level should be roughly equal in size to the original
>     data being tiled, since the data isn't really changing, but rather
>     only being chunked up into smaller pieces.   Each new level
>     decreases in size to  approximately  1/4^th the previous with
>     regard to tile numbers, and the individual tiles will be roughly
>     the same size across all levels of the pyramid.
>
>     Bobb
>
>     *From:*geomoose-users-bounces at lists.osgeo.org
>     <mailto:geomoose-users-bounces at lists.osgeo.org>
>     [mailto:geomoose-users-bounces at lists.osgeo.org
>     <mailto:geomoose-users-bounces at lists.osgeo.org>] *On Behalf Of
>     *Paul Wickman
>     *Sent:* Monday, January 28, 2013 6:53 PM
>     *To:* geomoose-users at lists.osgeo.org
>     <mailto:geomoose-users at lists.osgeo.org>
>     *Subject:* [Geomoose-users] Estimating tile size
>
>     Greetings,
>
>     I know this type of question goes around often in various flavors.
>      Difficult to estimate exact size of rendered tiles, but thought
>     I'd try to get some opinions.
>
>     I see this questions asked in a variety of ways and I know it's
>     not exactly precise on how to get the answer, but I'll throw my
>     question out to see what I get ;)
>
>     We have a client who would like us to tile and serve up
>     high-resolution aerial photography that they own. The area is
>     about 800 square miles and the imagery is 6-inch resolution.
>     They'd like to be able to view the imagery at zoom levels 11
>     through 20 (with level 20 being 1 pixel=6 inches). Is there any
>     way at all to determine how large a resulting raster tile set
>     might be?
>
>     Many thanks,
>
>       Paul
>
>     -- 
>     Paul Wickman
>     CTO | Flat Rock Geographics
>     612.280.5850 <tel:612.280.5850> | paul at flatrockgeo.com
>     <mailto:paul at flatrockgeo.com>
>     www.flatrockgeo.com <http://www.flatrockgeo.com> |
>     twitter.com/flatrockgeo <http://twitter.com/flatrockgeo>
>
>
>
>
> -- 
> Paul Wickman
> CTO | Flat Rock Geographics
> 612.280.5850 | paul at flatrockgeo.com <mailto:paul at flatrockgeo.com>
> www.flatrockgeo.com <http://www.flatrockgeo.com> | 
> twitter.com/flatrockgeo <http://twitter.com/flatrockgeo>
>
>
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