[Qgis-user] format for raster data distribution, JP2?

[MORREALE Jean Roc]

Hi Alex, could you point me to the exact page containing this 
information ? I've not been able to locate it

Le 15/07/2011 22:21, Alex Mandel a écrit :
> You might want to talk with the OpenAerialMap team about what they've
> been doing. Somehow they shrunk 25TB to 5TB of NAIP imagery using some
> fancy gdal techniques (as best I understand).
> http://www.openaerialmap.org/Main_Page
>
> Enjoy,
> Alex
>
> On 07/15/2011 11:58 AM, John Callahan wrote:
>> I'm looking for advice on sharing raster data for download.  We distribute
>> several raster datasets such as DEMs and orthophotography.  Sometimes these
>> are divided into rectangular tiles, sometimes by geography/boundaries.  Most
>> of our audience has some level of GIS or CAD experience. We also have WMS
>> services but there are many times where people need the actual data files.
>>
>> I had been creating JP2 files using JP2ECW compression.  Great file size
>> reduction with very good quality. However, I'm thinking it may be difficult
>> for people to view these (and more difficult for me to create) due to the
>> restrictions on the codec distribution.  The other JP2 options, OpenJPEG and
>> libjasper, seems like they also require users to obtain this codec/driver
>> and install into the software first.   Same for the commercial Kakadu and
>> MrSID.  netCDF is great but not widely supported; IMG are good but not any
>> advantage over TIFs (except for>  4 GB file sizes)
>>
>> Since I want to serve the widest possible audience (and not cater only to
>> our Windows/ArcGIS audience), I'm down to serving TIFs with JPEG compression
>> at around quality=75, which is what I started with years ago!  Good quality,
>> decent compression, wide support.   Is this the best bet?   Is there
>> something else out there I'm overlooking?
>>
>> - John
>>
>> ***********************************
>> John Callahan, Research Scientist
>> Delaware Geological Survey
>> University of Delaware
>> URL: http://www.dgs.udel.edu
>> *******************************
>
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