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

[John Callahan]

Thanks everyone for your feedback.  Good to know that I'm not missing the
boat here.  TIFF with JPEG might be a lossly compression and not as
efficient in reducing file size as JP2, or as flexible as WCS, however, it
is widely supported, which is the most important aspect for our
distribution.

- John

***********************************
John Callahan, Research Scientist
Delaware Geological Survey
University of Delaware
URL: http://www.dgs.udel.edu
*******************************


On Mon, Jul 18, 2011 at 4:51 AM, <jonathanmoules at warwickshire.gov.uk> wrote:

> Hi John,
>         Another option would be to use WCS (Web Coverage Service), the
> lesser-known sibling of WFS and WMS. Where WFS is designed to distribute
> Vector data, WCS is designed for Rasters. Up-take has been slower than the
> other two, but there are a several open-source tools for serving it (i.e.
> GeoServer, MapServer), and one or two for reading it (i.e. GvSIG, GDAL).
> See - https://secure.wikimedia.org/wikipedia/en/wiki/Web_Coverage_Service
>
> Jonathan
>
>
>
> From:        John Callahan <john.callahan at udel.edu>
> To:        OSGeo Discussions <discuss at lists.osgeo.org>,
> qgis-user at lists.osgeo.org
> Date:        15/07/2011 19:58
> Subject:        [Qgis-user] format for raster data distribution, JP2?
> Sent by:        qgis-user-bounces at lists.osgeo.org
> ------------------------------
>
>
>
> 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* <http://www.dgs.udel.edu/>
>
> *******************************
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