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<p class=MsoNormal><span style='color:#1F497D'>BTW, I tried the gdal_translate
to test how the images work as ecw however, they end up being larger than the
500MB limit set by the free ECW sdk so they won’t translate. The
FWTools is a very cool utility though. Frank has done a great job with
it.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Jonathon<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Andy
Morsell<br>
<b>Sent:</b> Wednesday, June 13, 2007 11:20 PM<br>
<b>To:</b> 'MapGuide Users Mail List'<br>
<b>Subject:</b> RE: [mapguide-users] MrSID files through GDAL FDO provider<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Hi Jonathon,</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>All of my answers refer to 1.2 RC1.</span><span style='font-size:
12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Yes, the GDAL provider does try to hit all of the images in the
feature source when the map is first accessed regardless of whether that layer
is actually visible. This issue has been entered by me into Trac
already. </span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>I have seen the ECW and MrSID providers trying to access the same
image files as well. Doesn't make sense to me either.</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>I am currently running a client site with 10 GB of ECW imagery,
each about 25 MB and seeing relatively good performance (except for the first
issue above). So, perhaps your issue is more confined to the MrSID
format? In my case, the data started as JPEG2000 format which the GDAL
provider could not successfully read so I used fwtools gdal_translate to
convert all of them to ECW. Perhaps translating your MrSID's to ECW's
would help in this case? Also, Jason Birch and others are working on
image tile index support for directories of images which could help with your
particular problem.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>By the way, here are some of the GDAL issues I have logged
with the 1.2 beta that might be of interest:</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><a href="http://trac.osgeo.org/mapguide/ticket/191">http://trac.osgeo.org/mapguide/ticket/191</a></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><a href="http://trac.osgeo.org/mapguide/ticket/187">http://trac.osgeo.org/mapguide/ticket/187</a></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><a href="http://trac.osgeo.org/mapguide/ticket/160">http://trac.osgeo.org/mapguide/ticket/160</a></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
</div>
<p><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif"'>Andy
Morsell, P.E.</span> <br>
<span style='font-size:7.5pt;font-family:"Tahoma","sans-serif"'>Spatial
Integrators, Inc.</span> <br>
<span style='font-size:7.5pt;font-family:"Tahoma","sans-serif"'><a
href="http://www.SpatialGIS.com">http://www.SpatialGIS.com</a></span> <o:p></o:p></p>
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<hr size=2 width="100%" align=center>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Jonathon
McIntyre<br>
<b>Sent:</b> Wednesday, June 13, 2007 12:21 PM<br>
<b>To:</b> mapguide-users@lists.osgeo.org<br>
<b>Subject:</b> [mapguide-users] MrSID files through GDAL FDO provider</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal>Good morning,<o:p></o:p></p>
<p class=MsoNormal>I am working with MGOS 1.2 RC1 and the latest GDAL FDO
providers on XP Pro.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a directory with twenty five 40MB MrSID files in
it. If I create a single data source against that directory, I have a
limited possibility that the images will actually process although there does
not seem to be any errors when I run MGServer from the command line. It appears
that the datasource is processed whether or not the layer is turned on.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>As an aside, I did notice that if I have the ECW dll
in the directory, the messages indicate that it is trying to read the .sid
format files as ECW which adds to the time.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In order to test things out, I created a data source for
each file. I noticed that for a couple of files, the processor usage
spikes to 100% but the images are displayed quickly. As I add more files,
the processor spikes become longer and the delays far more apparent. When
I get all 25 added my processor spikes to 100% usage for several minutes
although the images will eventually display. Watching the mgserver from
the command line shows that the images process and some go very quickly but
others seem to be very slow (which may just be the result of the processor
being pegged).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I tried using fwtools to mosaic these images together but
can only get about 4 together before I hit the 4GB tiff limit.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am trying to create a new single mosaiced .sid file to see
if that will make a difference but was wondering if there were any other ideas
of what I could do to improve the performance of the display of the images?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal>J<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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