[Benchmarking] Too much raster data?

[Dane Springmeyer]

On Jul 26, 2010, at 6:47 AM, Frank Warmerdam wrote:

> Andrea Aime wrote:
>> Jeff McKenna wrote:
>>> Iván Sánchez Ortega wrote:
>>>> On Sunday 25 July 2010 08:37:15 Andrea Aime wrote:
>>>>> The original target size was 100GB of imagery, which would be reached
>>>>> by taking a subset of 12 files instead (a 4x3 block)
>>>>> 
>>>>> Soo... shall we select a subset of files?
>>>> 
>>>> I'll go wild and say 14:
>>>> 
>>>> 0362-0365
>>>> 0391-0392
>>>> 0419-0421
>>>> 0447-0448b
>>>> 
>>>> That covers a nice area around Barcelona, with lots of blank data.
>>> 
>>> Sounds good to me.
>>> 
>> One question. For the baseline test are
>> we going to crate a single giant geotiff or have people
>> use a mosaic of those 14 files?
>> The mosaic of 14 files is going to be around 113.4GB,
>> but if we create a single seamless file I believe the
>> size will be equivalent to 16 files instead, since
>> we have no compression, which is  129.6GB.
>> Frank, others, what do we do? Single giant file or
>> mosaic?
> 
> Andrea,
> 
> It has just occurred to me that even if we do not create a seamless file,
> the file will all need to be BigTIFF since they are larger than 4GB.
> Is this going to be a problem for any participants?
> 
> My intent had been to create one geotiff file per ecw file.

Mapnik uses GDAL for reading rasters, so BigTIFF sounds just fine.

- Dane

> 
> Best regards,
> -- 
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
> 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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