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<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2>Hi Jonathon,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2>All of my answers refer to 1.2 RC1.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2>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. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2>I have seen the ECW and MrSID providers trying to access
the same image files as well. Doesn't make sense to me
either.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2>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.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2>By the way, here are some of the GDAL issues I have
logged with the 1.2 beta that might be of interest:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2><A
href="http://trac.osgeo.org/mapguide/ticket/191">http://trac.osgeo.org/mapguide/ticket/191</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2><A
href="http://trac.osgeo.org/mapguide/ticket/187">http://trac.osgeo.org/mapguide/ticket/187</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2><A
href="http://trac.osgeo.org/mapguide/ticket/160">http://trac.osgeo.org/mapguide/ticket/160</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156510806-14062007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV> </DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face=Tahoma size=1>Andy Morsell, P.E.</FONT></SPAN>
<BR><SPAN lang=en-us><FONT face=Tahoma size=1>Spatial Integrators,
Inc.</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Tahoma size=1><A
href="http://www.SpatialGIS.com">http://www.SpatialGIS.com</A></FONT></SPAN>
</P>
<DIV>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> 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<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<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></DIV></BODY></HTML>