On Sun, Feb 12, 2012 at 6:29 PM, John Armstrong <[email protected]> wrote:
> On 02/12/2012 12:25 PM, Andrea Aime wrote:
>
> On Sun, Feb 12, 2012 at 5:39 PM, John Armstrong <[email protected]> wrote:
>
>>
>> Any ideas? How does this work for ImageMosaics? Thanks in advance.
>>
>
> It most likely doesn't.
>
> Feel free to provide patches to make this case work (I suppose you have
> very
> few values for time/elevation?)
>
>
> I'll see if I can come up with something; we're looking at updating a
> layer daily and being able to retrieve timestamped tiles from a
> BigTable-like datastore. I don't really know about typical use cases, but
> I wouldn't be surprised if a user wanted to scroll through, say, a month's
> worth of updates at various zoom levels. It all depends on what you mean
> by "very few".
>
Tens? Or else, the area is very small (county or smaller), or the zoom
level is not thought to match Google Maps (does not go down to 20).
See this spreadsheet to estimate the size of a tile cache for a fully
developed tile cache, on disk,
for a certain area:
https://docs.google.com/spreadsheet/ccc?key=0Aq3GF1EnUyHEdHlDSW03cno4NzUzRFVHQzlGeU9YYXc#gid=0
I've filled it with the Massachusetts bounds, at level 20 the tile cache
uses 4TB of disk.
You don't go very far with one of the above for each possible
time/elevation value...
Cheers
Andrea
--
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Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
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