[Benchmarking] Raster dataset

[Jason Birch]

Have decisions been made about minimum and maximum scales for the
orthophotos?  If they are beig requested at scales that read from more
than a few orthophotos at a time, it would be really useful if they
could also be aggregated up into one or more layers of merged overview
tiffs for optimal viewing at those levels.

Frank, I made similar guesses about appropriate block size based on
typical usage of my orthophotos, trying to optimize for the number of
blocks that would be displayed on a typical viewport under normal
usage. I wasn't working from any real knowledge of the underlying
access mechanisms though, and would be interested to know if I was
totally out to lunch on this "logic"

Given the time it took me to download the vector data, I'm not sure
that I'll have the raster any time soon :)

On 2010-07-23, Frank Warmerdam <warmerdam at pobox.com> wrote:
> Ivan Grcic wrote:
>> Hi Ivan,
>>
>> no problem, when I download them Ill run them trough gdal.
>>
>> Can we specify which gdal_parameters parameters to use? Is this
>> already specified on some benchmarking wiki page?
>>
>> gdal_translate
>> -of GTIFF
>> -co PROFILE=GeoTIF
>> -co TILED=YES
>> -co BLOCKXSIZE=512
>> -co BLOCKYSIZE=512
>> -co COMPRESS=NONE
>> -co INTERLEAVE=PIXEL
>> -some other options ?
>>
>> Will run them trough gdaladdo also right?
>>
>> gdaladdo
>> -r nearest
>> --config INTERLEAVE_OVERVIEW PIXEL
>> how many levels to add? (4 8 16 32 64 128)
>
> Ivan,
>
> 512 is an unusually large block size.  Any reason to go so big?  Why
> not 256 or even 128?
>
> The profile can be omitted.  GeoTIFF is the default.
>
> Likewise for COMPRESS.
>
> I'd suggest averaged overviews for airphoto data - I'm assuming these are
> orthophoto's, right?
>
> 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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