[Geomoose-users] Estimating tile size

[Paul Wickman]

Thanks, Brent.  Looking back, the TIFF is 20GB because it's actually
extents about 1.8x beyond the municipal boundary, so your original math
bears out.  I'd be looking at ~32GB for the resulting level 11-20 tiles.

Thanks,
  Paul


On Tue, Jan 29, 2013 at 12:31 PM, Brent Fraser <bfraser at geoanalytic.com>wrote:

>  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> 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  1/4th 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] *On Behalf Of *Paul Wickman
>> *Sent:* Monday, January 28, 2013 6:53 PM
>> *To:* 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 | paul at flatrockgeo.com
>> www.flatrockgeo.com | twitter.com/flatrockgeo
>>
>
>
>
>  --
> Paul Wickman
> CTO | Flat Rock Geographics
> 612.280.5850 | paul at flatrockgeo.com
> www.flatrockgeo.com | twitter.com/flatrockgeo
>
>
> _______________________________________________
> Geomoose-users mailing listGeomoose-users at lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/geomoose-users
>
>
>


-- 
Paul Wickman
CTO | Flat Rock Geographics
612.280.5850 | paul at flatrockgeo.com
www.flatrockgeo.com | twitter.com/flatrockgeo
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