<font size=3 face="Arial">Hi John,</font><br><font size=3 face="Arial"> 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).</font><br><font size=3 face="Arial">See - </font><a href=https://secure.wikimedia.org/wikipedia/en/wiki/Web_Coverage_Service><font size=3 face="Arial">https://secure.wikimedia.org/wikipedia/en/wiki/Web_Coverage_Service</font></a><br><br><font size=3 face="Arial">Jonathan </font><br><br><br><br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">John Callahan <john.callahan@udel.edu></font><br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">OSGeo Discussions <discuss@lists.osgeo.org>,
qgis-user@lists.osgeo.org</font><br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">15/07/2011 19:58</font><br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">[Qgis-user]
format for raster data distribution, JP2?</font><br><font size=1 color=#5f5f5f face="sans-serif">Sent by:
</font><font size=1 face="sans-serif">qgis-user-bounces@lists.osgeo.org</font><br><hr noshade><br><br><br><font size=3>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.<br><br>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)<br><br>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?<br><br>- John<br><br>***********************************<br>John Callahan, Research Scientist<br>Delaware Geological Survey<br>University of Delaware<br>URL: </font><a href=http://www.dgs.udel.edu/ target=_blank><font size=3 color=blue><u>http://www.dgs.udel.edu</u></font></a><font size=3><br>*******************************</font><tt><font size=2>_______________________________________________<br>Qgis-user mailing list<br>Qgis-user@lists.osgeo.org<br></font></tt><a href="http://lists.osgeo.org/mailman/listinfo/qgis-user"><tt><font size=2>http://lists.osgeo.org/mailman/listinfo/qgis-user</font></tt></a><tt><font size=2><br></font></tt><br><BR>
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